CBSE Class 10 Science HOTs Question Life Processes

Please refer to CBSE Class 10 Science HOTs Question Life Processes. Download HOTS questions and answers for Class 10 Science. Read CBSE Class 10 Science HOTs for Chapter 6 Life Processes below and download in pdf. High Order Thinking Skills questions come in exams for Science in Class 10 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 10 Science HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 10 Science and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Class 10

Chapter 6 Life Processes Class 10 Science HOTS

Class 10 Science students should refer to the following high order thinking skills questions with answers for Chapter 6 Life Processes in Class 10. These HOTS questions with answers for Class 10 Science will come in exams and help you to score good marks

HOTS Questions Chapter 6 Life Processes Class 10 Science with Answers

Multiple Choice Question

Question. Which of the following statements are true about autotrophs?           
(a) They convert carbon dioxide and water into carbohydrates in presence of light.
(b) They store carbohydrates in the form of starch.
(c) They occupy second trophic level in food chains.
(d) They are chlorophyll-bearing organisms.

Answer : A

Question. In human body, food is finally digested in           
(a) large intestine
(b) small intestine
(c) stomach
(d) oesophagus

Answer : B

Question. Which of the following events takes place during photosynthesis?           
(a) Trapping of light energy by chlorophyll molecules
(b) Conversion of light energy to chemical energy
(c) Reduction of CO2 to carbohydrates
(d) Release of CO2 in the atmosphere

Answer : A

Question. The muscular and tubular part of the alimentary canal is called       
(a) pharynx
(b) small intestine
(c) oesophagus
(d) stomach

Answer : C

Question. Which of the following functions is carried out by pancreatic juice?       
(a) Lipase emulsifies fats and trypsin digests proteins.
(b) Lipase digests carbohydrates and trypsin digests fats.
(c) Lipase emulsifies both carbohydrates and fats.
(d) Trypsin digests both proteins and fats.

Answer : A

Question. In which of the following groups of organisms food material is broken down outside the body?           
(a) Cuscuta, Amoeba, green plants
(b) Amoeba, Paramoecium, Cuscuta
(c) Yeast, green plants, mushroom
(d) Mushroom, bread mould, yeast

Answer : D

Question. Which of the following protects the inner lining of stomach from hydrochloric acid?           
(a) Mucus
(b) Bile
(c) Pepsin
(d) Amylase

Answer : A

Question. Select the incorrect statement(s).    
(a) Heterotrophs contain chlorophyll pigments.
(b) Heterotrophs can convert solar energy to chemical energy.
(c) Heterotrophs are unable to synthesize food.
(d) Heterotrophs occupy first trophic level in food chain.

Answer : A

Question. During photosynthesis oxygen is evolved from        
(a) CO2
(b) water
(c) glucose
(d) chlorophyll

Answer : B

Question. Which of the following statement(s) is/are correct?    
(a) Fermentation is a form of aerobic respiration.
(b) Aerobic respiration involves mitochondria.
(c) Lactic acid is formed in human muscle cells during anaerobic respiration.
(d) Pyruvate can be converted into ethanol in mitochondria.

Answer : B

 

Question. The part of the digestive system where no digestion takes place is
(a) ileum
(b) stomach
(c) mouth
(d) oesophagus

Answer : D

Question. The procedure used for cleaning the blood of a person by separating urea from it is called:
(a) osmosis
(b) filtration
(c) dialysis
(d) double circulation

Answer : C

Question. Which plant tissue transports water and min-erals from the roots to the leaf?
(a) Xylem
(b) Phloem
(c) Parenchyma
(d) Collenchyma

Answer : A

Question. The filtration units of kidneys are called 
(a) ureter
(b) urethra
(c) neurons
(d) nephrons

Answer : D

Question. A blood vessel which pumps the blood from the heart to the entire body:
(a) artery
(b) capillary
(c) Vein
(d) Haemoglobin

Answer : A

Question. The fermentation of glucose by yeast normally yields
(a) alcohol, CO2 and 36 ATP
(b) CO2, H20 and 36 ATP
(c) alcohol, CO2 and 2ATP
(d) lactic acid, CO7 and 2 ATP

Answer : D

Question. Normal blood pressure (systolic/diastolic) is
(a) 120/80 mm of Hg
(b) 160/80 mm of Hg
(c) 120/60 mm of Hg
(d) 180/80 mm of Hg

Answer : A

Question. Roots of the plants absorb water from the soil through the process of:
(a) diffusion
(b) transpiration
(c) osmosis
(d) None of these

Answer : C

Question. Autotrophic organisms include
(a) bacteria and virus
(b) bacteria and fungi
(c) green plants and some bacteria
(d) green plants and all bacteria

Answer : C

Question. From the given picture of the digestive system, identify the part labelled as gastric gland.
(a) A
(b) B
(c) C
(d) D

Answer : B

Question. Blood pressure is measured by an instrument called
(a) barometer
(b) sphygmomanometer
(c) photometer
(d) manometer

Answer : B

Question. Identify the correct path of urine in the human body.
(a) Kidney → urinary bladder → urethra → ureter
(b) Urinary bladder → ureter → kidney → urethra
(c) Kidney → ureter → urethra → urinary bladder
(d) Kidney → ureter → urinary bladder → urethra

Answer : D

Question. The mode of nutrition found in fungi is:
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition

Answer : D

Question. When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of 
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour

Answer : B

Question. Oxygen liberated during photosynthesis comes from 
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose

Answer : A

Question. A large quantity of one of the following is removed from our body by lungs:
(a) CO2 and H20
(b) CO2 only
(c) FLO only
(d) ammonia

Answer : A

Question. Which part of alimentary canal receives bile from the liver? 
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Oesophagus

Answer : B

Question. The opening and closing of the stomatal pore depends upon
(a) oxygen
(b) temperature
(c) water in guard cells
(d) concentration of CO2 in stomata

Answer : C

Question. In amoeba, food is digested in the:
(a) food vacuole
(b) mitochondria
(c) pseudopodia
(d) chloroplast

Answer : A

Question. In respiration, air passes through
(a) Pharynx → nasal cavity → larynx → trachea bronchi → bronchioles
(b) Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles
(c) Larynx → nasal cavity’ → pharynx → trachea
(d) Larynx → pharynx trachea → lungs

 

Answer : B

Fill in the blanks.

Question. Nutrition provides ...... to the body.
Answer : nutrients

Question. Pyruvate may be converted into ethanol and CO2 during ...... .
Answer : fermentation

Question. ...... pairs of salivary glands are present in human mouth.
Answer : Three

Question. The opening and closing of stomata is regulated by ...... .
Answer : guard cells

Question. Heterotrophic organisms obtain food from ...... organisms.
Answer : other

Write Yes/No.

Question. Is Cuscuta a parasitic plant?
Answer : Yes

Question. Does food mix thoroughly with saliva in our mouth when we chew properly?
Answer : Yes

Question. Are carbohydrates stored in the form of starch in plants?
Answer : Yes

Question. Is it true that light energy is not directly absorbed by chlorophyll molecules?
Answer : No

Question. Does our chest cavity become smaller when we breathe in?
Answer : No

True (T) or False (F).

Question. Carbon monoxide binds more strongly to haemoglobin than oxygen.
Answer : true 

Question. All alveoli are not covered by web of blood capillaries.
Answer : false

Question. Carbon and energy requirements of the autotrophic organisms are fulfilled by photosynthesis.
Answer : true 

Question. Oxygen is released during photosynthesis.
Answer : true 

Question. CO2 is not essential for photosynthesis.
Answer : false

Question Answer

Question. Due to availability of less water, how does the plant cope up with lack of water in desert conditions?
Answer : They open their stomata at night and stomata remain closed during day time, to conserve moisture.

Question. After a vigorous exercise, you may experience cramps in your leg muscles. Why does this happen?
Answer : The sudden build up of lactic acid in our muscles during vigorous, exercise, causes muscular cramps in our leg muscles.

Question. What will happen if carbon monoxide combines with haemoglobin?
Answer : If the haemoglobin binds with carbon monoxide strongly, the oxygen will not be carried with blood leading to death of the organism.

Question. Food moves down the gut by peristalsis. Which region of brain controls peristalsis?
Answer : Medulla of hind brain

Question. Name the pigment present in plants, which can absorb solar energy.
Answer : Chlorophyll.

Question. Name the respiratory organs of (i) fish (ii) mosquito (iii) earthworm.
Answer : Fish - gills
Mosquito – Trachea (air tubes)
Earthworm – moist skin

Question. Which of the four chambers of the human heart has the thickest muscular walls?
Answer : Right ventricle.

Question. What will be the outcome if a farmer floods his field everyday?
Answer : Respiration of plants will be affected because the oxygen present in the interspaces of the soil will be replaced by water.

Question. Which part of visible spectrum is absorbed by chlorophyll pigments?
Answer : Blue and Red light

Question. How does respiration in plants differ from that in animals?
Answer : In plants, all parts like the root, stem, leaves, etc., perform respiration individually., while in animals, either the general body surface or specific organs like the skin, gills, lungs, etc., are involved in respiration. The rate of respiration is much slower in plants than in animals. Unlike animals, there is little transport of gases from one part of the plant to another.

Question. Name the cartilaginous flap which closes the glottis to check the entry of food into it during swallowing.
Answer : Epiglottis

Question. Which equipment is used to facilitate breathing during serious breathing problems?
Answer : Ventilator

Question. Chloroplast are called energy convertors. Explain.
Answer : Chloroplasts are called energy convertors because they trap the solar energy and convert it into chemical energy.

Question. Why is the rate if breathing much faster in aquatic organisms than those of terrestrial organisms?
Answer : The aquatic organisms obtain oxygen dissolved in water. As compared to air, the availability of oxygen in water is fairly low. Hence, the aquatic organisms have to breathe faster as compared to the terrestrial organisms.

Question. Why are glomeruli considered as dialysis bags?
Answer : The main function performed by the glomeruli is selective filtration. They filter small molecules containing glucose, salts, urea, and liquid serum. Etc. The large molecules such as proteins remain in blood. Thus, glomeruli of the kidneys function as dialysis bags.

Question. Autotrophs synthesise food for the living world. Justify this statement in one sentence only interconnecting autotrophs and heterotrophs.
Answer : The food producers are autotrophs and all the heterotrophs consume the food produced by the autotrophs directly or indirectly.

Question. Veins and arteries carry blood. Which of these carry blood?
a) Away from the heart?
b) Back to the heart?
Answer : a) Arteries carry blood away from the heart.
b) Veins carry blood back to the heart.

Question. Which of the organs perform the following functions in humans?
1. Absorption of food.
2. Absorption of water
Answer : 1. Absorption of food takes place in small intestine.
2. Large intestine

Question. Name the areas in a woody stem through which respiratory exchange of gases take place.
Answer : In woody stem, the bark has lenticels for gaseous exchange.

Question. Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets?
Answer : The acid is formed in the mouth after a sugary food (chocolates and sweet) has been taken. This acid lowers the pH in the mouth. Tooth decay starts when the pH of acid formed in the mouth falls below 5.5. This is because then the acid becomes strong enough to attack the enamel of our teeth and corrode it.

Question. A certain tissue in a green plant somehow get blocked and the leaves wilted. What was the tissue that got blocked?
Answer : The tissue that got blocked may be xylem. It is through the xylem that water and minerals absorbed by roots from the soil are transported to the leaves and other parts of the plant. So, if xylem is blocked, the leaves will not get the nourishment and will get wilted.

Question. Write one feature which is common to each of the following pairs of the term/organs.
i) glycogen and starch ii) chlorophyll and haemoglobin
iii) gills and lungs iv) arteries and veins.
Answer : i) Carbohydrate (food)
             ii) Pigments.
             iii) Respiratory organs.
             iv) Blood vessels.

Question. Why doesn’t the lungs collapse even after forceful expiration?
Answer : Even after forceful expiration to the maximum capacity, some amount of air remains in the lungs, known as residual volume. So, the lungs doesn’t collapse even after forceful expiration.

Question. The two openings of the pharynx, one leading to trachea and the other leading to oesophagus, lie very close to each other. Yet food we swallow normally does not enter into our trachea. Why?
Answer : The food does not enter into trachea because during swallowing, the aperture leading to trachea (glottis) gets covered by a cartilaginous flap called epiglottis and the food has no other passage except going into the oesophagus.

Question. How would it affect the digestion of proteins and carbohydrates if the duodenum of man if there is a blockade in the pancreatic duct?
Answer : Duodenum is the region where the pancreatic juice secreted by the pancreas enters. The enzymes pancreatic amylase and trypsin helps in the digestion of carbohydrates and proteins. Thus, if there is a blockade, the digestion of carbohydrates and proteins gets affected.

Question. What do you mean by double circulation of blood?
Answer : Blood passes through the heart twice for each cycle of the body.

Question. “If there were no algae there would be no fish in the sea”. Comment.
Answer : Algae produce O2 as a result of photosynthesis. This oxygen is utilised by the fishes in the sea for carrying out respiration. If there were no algae, no oxygen would have been produced. Thus, fishes might have died.

Question. Write the functions of the following in the digestive process:
(i) Bile
(ii) Bicarbonate secreted by the duodenal wall.
(iii) Pancreatic amylase.
Answer : 1. Bile: It is secreted by the gall bladder and it emulsifies the fats into the smaller droplets for their easy digestion.
               2. It provides alkaline medium in the duodenum which is needed for the action of pancreatic enzymes of different food components for their digestion.
               3. Pancreatic amylase enzyme digests starch and changes it into maltose.

Question. Why is the process of diffusion insufficient to meet the oxygen requirement of human beings?
Answer : The process of diffusion for carrying O2 to all parts of the body is not sufficient for larger multicellular organisms like human beings. Hence, respiratory pigment haemoglobin takes up oxygen from the air and carry it to all the parts of our body through blood.

Question. Draw a diagram of human alimentary canal showing duodenum, small intestine, liver and pancreas.
Answer : Textbook Page No. 99, Figure 6.6 

Question.  While eating you are advised not to talk. Why are you advised so? 
Answer : We are advised so because while eating some food particles might enter the wind pipe which can lead to choking.

Question. We say that movement is a characteristic of living organisms but we always don’t see visible movements in plants. Comment. 1 Mark
Answer : We always don’t see visible movements in plants. It does not mean that they are not alive. Molecular movements take place in their body.

Question. If a person is working on a treadmill in a gymnasium, will it effect his rate of breathing? How? 
Answer : Yes, it will affect his rate of breathing. The rate of breathing will become fast to supply more oxygen to meet the increased demand of energy.

Question. If you compare your rate of breathing by feeling your chest movement with the number of times a fish opens and closes its mouth. Which will be higher and why? 2 Marks
Answer : The number of times a fish opens and closes its mouth will be higher as the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. Therefore, rate of breathing in aquatic organisms is much faster than in terrestrial organisms.

Question. Mucus is not used for churning the food or digesting it. Then why is it secreted in the stomach? 
Answer : Mucus is secreted in the stomach to protect its inner lining from being damaged by HCl. Excessive secretion of HCl can damage the lining and lead to peptic ulcer.

Question. In the process of Photosynthesis food A is prepared which gets converted into food B. What are A and B? Why is A converted to B? 2 Marks
Answer : Food A is glucose and food B is Starch.
A is converted to B as B is insoluble form of carbohydrate. It is more compact and hence, suitable for storage.

Question. When we are asleep we are not performing any activity still our life processes are going on. Why? 
Answer : “The maintenance functions of living organisms must go on even when they are not doing anything particular.” That is why the life processes are going on even while we are asleep or not performing any activity.

Question. Leaves of a healthy potted plant were coated with petroleum jelly. How will it affect the plant? State two reasons. 
Answer : The plant will not remain healthy for long due to the following reasons:-
1. There will be no transpiration.
2. There will be no exchange of gases which will affect the rate of photosynthesis.

Question. The wall of trachea is supported by cartilage rings. Give reasons.

Answer. The wall of trachea is supported by C shaped cartilage rings which does not allow the collapse of trachea when there is not much air in it.

Question. Write one feature which is common to each of the following pairs of terms/organs:

i) Glycogen and starch ii) Chlorophyll and hemoglobiniii) Gills and Lungs iv) Arteries and Veins

Answer. i)Glycogen and starch: Reserve food is in the form of glycogen in animal cell and starch in plant cell.

ii) Chlorophyll and hemoglobin: Both are pigments, chlorophyll is photosynthetic pigment while hemoglobin is respiratory pigment present in blood.

iii) Gills and Lungs: Both are organs meant for breathing, gills in fish and lungs in birds and mammals.

iv) Arteries and Veins: both are blood vessels, arteries carry blood from heart to different parts of the body while veins bring back blood from different parts of body towards heart.

Question. Why is the rate if breathing much faster in aquatic organisms than those of terrestrial organisms?

Answer.The aquatic organisms obtain oxygen dissolved in water. As compared to air, the availability of oxygen in water is fairly low. Hence, the aquatic organisms have to breathe faster as compared to the terrestrial organisms

Question. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Answer.- They have high energy requirement for maintaining their body temperature. This is possible only if oxygenated and deoxygenated blood remain separated.

Question. Why does absorption of digested food occur mainly in the small intestine?

Answer. Maximum absorption occurs in small intestine because

i) Inner lining of small intestine is provided with villi which increases the surface area for absorption.

ii) Wall of intestine is richly supplied with blood vessels which take the absorbed food to each and every cell of the body.

Question. What are the methods used by plants to get rid of excretory products?

Answer. I) the oxygen which is produced during the process of photosynthesis gets removed through stomata.

ii) The carbon di oxide which is produced during process of respiration also gets removed through stomata.

iii) Excess of water gets removed through transpiration

iv) Some waste products are stored in cellular vacuoles.

v) Some waste products are stored as resins and gums especially in old xylem.

vi) Plants also excrete some waste substances into the soil around them.

vii) Some waste substances are also removed through petals, fruits and seeds.

Question. what will happen if carbon monoxide combines with hemoglobin?

Answer- If the hemoglobin binds with carbon monoxide strongly, the oxygen will not be carried with blood leading to death of the organism.

Question. A certain tissue in a green plant somehow get blocked and the leaves wilted. What was the tissue that got blocked?

Answer-The tissue that got blocked may be xylem. It is through the xylem that water and minerals absorbed by roots from the soil are transported to the leaves and other parts of the plant. So, if xylem is blocked, the leaves will not get the nourishment and will get wilted.

Question. Which organ secretes a hormone when the blood sugar rises? Name a digestive enzyme released by this organ and write down its function also.

Answer. The pancreas secretes a hormone insulin which regulates the blood sugar level. Digestive enzymes secreted by pancreas are trypsin and lipase, they helps in the digestion of proteins and fats respectively.

Question. Why is blood circulation in human heart called double circulation?

Answer. The blood passes through the heart twice in one complete cycle of the body. Once through the right heart in the form of deoxygenated blood and once through the left half in the form of oxygenated blood.

Question. What is common for cuscuta, ticks and leeches?
Answer. Cuscuta, ticks and leeches, all has parasitic mode of nutrition, they harm their host while taking nutrition.

Question. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
AnswerAdaptation of terrestrial organism over aquatic organism for efficient uptake of oxygen from air –
(i) Increased respiratory surface area.
(ii) Very fine and delicate surface for easy exchange of oxygen and carbon – dioxide.
(iii) Placement of respiratory surface within the body for protection
(iv) Mechanism for moving the air in and out of respiratory surface where the oxygen is absorbed

Question. Name the substrates for the following enzymes
1. trypsin
2. amylase
3. pepsin
4. lipase

Answera) Protein
b) Starch
c) Protein
d) Lipids

Question. What are the two stages in photosynthesis?
Answer. Two stages in photosynthesis –
a) Light reaction – Light energy breaks up water molecular into hydrogen and oxygen, called photolysis of
water
b) Dark reaction – Fixation and conversion of carbon – dioxide (CO ) into a simple carbohydrates glucose.

Question. What is villi? What are its functions?
AnswerFinger like projection present in the inner lining of small intestine are called villi. They increase the surface area for the absorption of digested food in the small intestine.

Question. What type of respiration takes place in human muscles during vigorous exercise and why?
Answer. During vigorous exercise, anaerobic respiration takes place in human muscles. During exercise our energy requirement increase, so our striated muscles start respiring anaerobically in the lack of oxygen and producers ATP molecules.

Question. How is opening and closing of stomata regulated?
Answer. The closing and openings of the stomata is regulated by guard cells. When the guard cells swell or turgid due to entry of water, the stomata are opened. The guard cells shrink due to loss of water the stomata get closed.

Question. State two vital functions of kidney.
Answer. Function of kidney are –
1. It maintains water balance in the body tissues.
2. It controls calcium levels in the blood to maintain healthy bones.

Question. Meat is easier to digest as compared to grass. Why?
AnswerIt is easier to digest meat because our digestive juices contain enzymes which can easily digest meat but our body does not digest cellulose which is a main component of grass.

Question. What is the role of glomerulus in kidney?
Answer. Glomerulus is a group of capillaries present in the cup like Bowman’s Capsule. It receives blood from renal artery which brings excretory wastes from body to the kidney. It filters water, salts, glucose, urea, the nitrogen containing end products of proteins and yellow bile compounds from the liver.

Question. Why is it essential to match the blood groups of donors and receiver person before arranging transfusion of blood?
Answer. RBC’s of blood carries antigen as well as antibody. If blood is not matched before transfusion then blood of receiver start producing antibodies against donor blood and destroys blood cells, this causes deficiency of blood and causes death.

Question. Why is it necessary to separate oxygenated & deoxygenated blood in mammals & birds?
Answer. Separation of oxygenated and deoxygenated blood allows good supply of oxygen to the body. This system is useful in animals that have high energy requirement Mammals and birds constantly need oxygen to get energy to maintain constant body temperature.

Question. Why the walls of trachea are supported by cartilaginous rings?
Answer. The trachea is supported by cartilaginous rings which prevent the collapsing even when there is not much air in it.

Question. What are the raw materials for photosynthesis?
Answer. Raw materials for photosynthesis are –
1. Carbon – dioxide
2. Water
3. Chlorophyll and Sunlight

Question. What is the role of diaphragm during inhalation and exhalation?
Answer. Diaphragm changes its shape during inhalation and exhalation and increases and decreases volume of thoracic cavity respectively. This causes entry and expel of air from lungs.

Question. What is the advantage of four chambered of heart?
Answer. The right and left parts are separated by a septum to prevent oxygenated and deoxygenated blood from mixing. This fulfills the constant use of energy to maintain their body temperature. Their energy needs are high, which are fulflled efficiently because of non – mixing of oxygenated & deoxygenated blood.

Question. Why is diffusion insuficient to meet the oxygen requirements of multicellular organisms like humans?
Answer. As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells.

Question. What criteria do we use to decide whether something is alive?
Answer. All the living organism must have movement at molecular levels along with respiration and other life process like nutrition, respiration, transportation and excretion to be called alive.

Question. What is the function of digestive enzymes?
Answer. Enzymes break-down the various complex components of food into simple and soluble components so that they can be absorbed easily.

Question. How are the lungs designed in human beings to maximize the area for exchange of gases?
AnswerIn lungs, the bronchioles terminate in balloon-like structures called alveoli. The alveoli contain network of blood capillaries that increase the surface area for exchange of gases.

Question. What is the role of saliva in the digestion of food?
Answer. The saliva contains an enzyme called salivary amylase that breaks down starch which is complex molecule into glucose.

Question. While eating you are advised not to talk Why are you advised so?
AnswerWe are advised so because while eating some food particles might enter the wind pipe which can lead to choking.

Question. We say that movement is a characteristic of living organisms but we always don’t see visible movements in plants. Comment.
Answer. We always don’t see visible movements in plants. It does not mean that they are not alive. Molecular movements take place in their body.

Question. If a person is working on a treadmill in a gymnasium, will it effect his rate of breathing? How?
Answer. Yes, it will affect his rate of breathing. The rate of breathing will become fast to supply more oxygen to meet the increased demand of energy.

Question. If you compare your rate of breathing by feeling your chest movement with the number of times a flsh opens and closes its mouth. Which will be higher and way?
Answer. The number of times a flsh opens and closes its mouth will be higher as the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. Therefore, rate of breathing in aquatic organisms is much faster than in terrestrial organisms.

Question. Mucus is not used for churning the food or digesting it. Then why is it secreted in the stomach?
AnswerMucus is secreted in the stomach to protect its inner lining form being damaged by HCI. Excessive secretion of HCI can damage the lining and lead to peptic ulcer.

Question. In the process of Photosynthesis food A is prepared which gets converted into food B. What are A and B? Why is A converted to B?
AnswerFood A is glucose and food B is Starch.
A is converted to B as B is insoluble form of carbohydrate. It is more compact and hence, suitable for storage.

Question. When we are asleep we are not performing any activity still our life processes are going on. Why?
Answer“The maintenance functions of living organisms must go on even when they are not doing anything particular.” That is why the life processes are going on even while we are asleep or not performing any activity.

Question. What will be the outcome if a farmer floods his field everyday?
Answer. Respiration of plants will be affected because the oxygen present in the interspaces of the soil will be replaced by water.

Question. Name the respiratory organs of (i) fish (ii) mosquito (iii) earthworm.
Answer. Fish – gills

Mosquito – Trachea (air tubes)
Earthworm – moist skin

Question. Due to availability of less water, how does the plant cope up with lack of water in desert conditions?
AnswerThey open their stomata at night and stomata remain closed during day time, to conserve moisture.

Question. After a vigorous exercise, you may experience cramps in your leg muscles. Why does this happen?
Answer. The sudden build up of lactic acid in our muscles during vigorous, exercise, causes muscular cramps in our leg muscles.

Question. What will happen if carbon monoxide combines with hemoglobin?
AnswerIf the hemoglobin binds with carbon monoxide strongly, the oxygen will not be carried with blood leading to death of the organism.

Question. Chloroplast are called energy convertors. Explain.
Answer. Chloroplasts are called energy convertors because they trap the solar energy and convert it into chemical energy.

Question. Why is the rate if breathing much faster in aquatic organisms than those of terrestrial organisms?
Answer. The aquatic organisms obtain oxygen dissolved in water. As compared to air, the availability of oxygen in water is fairly low. Hence, the aquatic organisms have to breathe faster as compared to the terrestrial organisms.

Question. Why are glomeruli considered as dialysis bags?
Answer. The main fimetion performed by the glomeruli is selective filltration. They filter small molecules containing glucose, salts, urea, and liquid senim. Etc. The large molecules such as proteins remain in blood. Thus, glomenili of the kidneys function as dialysis bags.

Question. Autotrophs synthesis food for the living world. Justify this statement in one sentence only interconnecting autotrophs and heterotrophs.
Answer. The food producers are autotrophs and all the heterotrophs consume the food produced by the autotrophs directly or indirectly.

Question. Veins and arteries catty blood. Which of these carry blood?
1. Away from the heart?
2. Back to the heart?
Answer. a) Arteries carry blood away from the heart.
b) Veins carry blood back to the heart.

Question. Which of the organs perform the following functions in humans?
1. Absorption of food.
2. Absorption of water
Answer. i. Absorption of food takes place in small intestine.
ii. Large intestine

Question. Name the areas in a woody stem through which respiratory exchange of gases take place.
Answer. In woody stem, the bark has lenticels for gaseous exchange.

Question. Why doesn’t the lungs collapse even after forceful expiration?
Answer. Even after forceful expiration to the maximum capacity, some amount of air remains in the lungs, known as residual volume. So, the lungs doesn’t collapse even after forceful expiration.

Question. “If there were no algae there would be no fish in the sea”. Comment.
AnswerAlgae produce 02 as a result of photosynthesis. l’his oxygen is utilized by the fishes in the sea for carrying out respiration. If there were no algae, no oxygen would have been produced. Thus, fishes might have died.

 

Question. Differentiate between single and double circulation found in vertebrates.

CBSE Class 10 Science HOTs Question Life Processes Set B


Question. What is the difference between arteries & veins?

CBSE Class 10 Science HOTs Question Life Processes Set B

Question. While eating you are advised not to talk. Why are you advised so? 1 Mark
 
Answer. We are advised so because while eating some food particles might enter the wind pipe which can lead to choking.
 
Question. We say that movement is a characteristic of living organisms but we always don’t see visible movements in plants. Comment. 1 Mark
 
Answer. We always don’t see visible movements in plants. It does not mean that they are not alive. Molecular movements take place in their body.
 
Question. If a person is working on a treadmill in a gymnasium, will it effect his rate of breathing? How? 2 Marks
 
Answer. Yes, it will affect his rate of breathing. The rate of breathing will become fast to supply more oxygen to meet the increased demand of energy.
 
Question. If you compare your rate of breathing by feeling your chest movement with the number of times a fish opens and closes its mouth. Which will be higher and why? 2 Marks
 
Answer. The number of times a fish opens and closes its mouth will be higher as the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. Therefore, rate of breathing in aquatic organisms is much faster than in terrestrial organisms.
 
Question. Mucus is not used for churning the food or digesting it. Then why is it secreted in the stomach? 2 Marks
 
Answer. Mucus is secreted in the stomach to protect its inner lining from being damaged by HCl. Excessive secretion of HCl can damage the lining and lead to peptic ulcer.
 
Question. In the process of Photosynthesis food A is prepared which gets converted into food B. What are A and B? Why is A converted to B? 2 Marks
 
Answer. Food A is glucose and food B is Starch. A is converted to B as B is insoluble form of carbohydrate. It is more compact and hence, suitable for storage.
 
Question. When we are asleep we are not performing any activity still our life processes are going on. Why? 2 Marks
 
Answer. “The maintenance functions of living organisms must go on even when they are not doing anything particular.” That is why the life processes are going on even while we are asleep or not performing any activity.
 
Question. Leaves of a healthy potted plant were coated with petroleum jelly. How will it affect the plant? State two reasons. 3 Marks
 
Answer. The plant will not remain healthy for long due to the following reasons:-
       1. There will be no transpiration.
       2. There will be no exchange of gases which will affect the rate of photosynthesis.
 
Question. How are fats digested in our bodies? Where does this process take place?
Answer. Digestion of fats takes place in small intestine. Fats entering in intestine are in the form of large globules. Bile juice breaks down these large globules into smaller globules. Afterwards fat digesting enzyme lipase present in pancreatic juice and intestinal juice converts it into fatty acids and glycerol.
 
Question. What are the necessary conditions for autotrophic nutrition and what are its by-products.
Answer. Conditions necessary for autotrophic nutrition are: 
(i) Light
(ii) Chlorophyll
(iii) Water and
(iv) Carbon dioxide
By-products are:
(i) Oxygen and
(ii) Water
 
Question. What are differences between aerobic and anaerobic respiration? Name some organisms that use anaerobic mode of respiration.
Answer. Difference between aerobic and anaerobic respiration: Anaerobic respiration takes place in yeast, some bacteria and some internal parasites like tapeworm.
 
Question. How are the alveoli designed to maximize the exchange of gases?
Answer. The walls of the alveoli is folded and has large surface areas. It contain an extensive network of blood vessels which provide a surface where the exchange of gases can take place.
 
Question. What would be the consequence of a defficiency of hemoglobin in our bodies?
Answer. Haemoglobin is a pigment present in RBC. It has a high affinity for oxygen. It carries oxygen from lungs to various tissues which are defficient in oxygen. Presence of less hemoglobin will result in less supply of oxygen to tissues. A person having less hemoglobin will get tired soon and will have a pale look.
 
Question. What are differences between the transport of materials in xylem and phloem?
Answer. Difference between transport in xylem and phloem:
 
Question. Compare the functioning of alveoli in the lungs and nephron in the kidneys with respect to their structure and functioning.
Answer. Comparison between alveoli and nephron:
 
Question. Leaves of a healthy potted plant were coated with petroleum jelly. How will it affiect the plant? State two reasons.
Answer. The plant will not remain healthy for long due to the following reasons:
1. There will be no transpiration.
2. There will be no exchange of gases which will affect the rate of photosynthesis.
 
Question. How does respiration in plants differ from that in animals?
Answer. In plants, all parts like the root, stem, leaves, etc., perform respiration individually., while in animals, either the general body surface or speciffic organs like the skin, gills, lungs, etc., are involved in respiration.
The rate of respiration is much slower in plants than in animals. Unlike animals, there is little transport of gases from one part of the plant to another.
 
Question. How does respiration in plants differ from that in animals?
Answer. The acid is formed in the mouth after a sugary food (chocolates and sweet) has been taken. This acid lowers the pH in the mouth. Tooth decay starts when the pH of acid formed in the mouth falls below 5.5. This is because then the acid becomes strong enough to attack the enamel of our teeth and corrode it.
 
Question. Name the cartilaginous flap which closes the glottis to check the entry of food into it during swallowing.
Answer. The tissue that got blocked may be xylem. It is through the xylem that water and minerals absorbed by roots from the soil are transported to the leaves and other parts of the plant. So, if xylem is blocked, the leaves will not get the nourishment and will get wilted.
 
Question. How does respiration in plants differ from that in animals?
Answer. In plants, all parts like the root, stem, leaves, etc., perform respiration individually., while in animals, either the general body surface or specific organs like the skin, gills, lungs, etc., are involved in respiration.
The rate of respiration is much slower in plants than in animals. Unlike animals, there is little transport of gases from one part of the plant to another.
 
Question. Write one feature which is common to each of the following pairs of the term/organs.
i) glycogen and starch
ii) chlorophyll and haemoglobin iii) gills and lungs
iv) arteries and veins.
Answer. i) Carbohydrate (food)
ii) Pigments.
iii) Respiratory organs.
iv) Blood vessels.
 
Question. A certain tissue in a green plant somehow get blocked and the leaves wilted. What was the tissue that got blocked?
Answer. The tissue that got blocked may be xylem. It is through the xylem that water and minerals absorbed by roots from the soil are transported to the leaves and other parts of the plant. So, if xylem is blocked, the leaves will not get the nourishment and will get wilted.
 
Question. Write the functions of the following in the digestive process:
i. Bile
ii. Bicarbonate secreted by the duodenal wall.
iii. Pancreatic amylase.
Answer. i. Bile: It is secreted by the gall bladder and it emulsiffes & it into the smaller droplets for their easy digestion.
ii. It provides alkaline medium in the duodenum which is needed for the action of pancreatic enzymes of different food components for their digestion.
iii. Pancreatic amylase enzyme digests starch and changes it into maltose.
 
Question. The two openings of the pharynx, one leading to trachea and the other leading to oesophagus, lie very close to each other. Yet food we swallow normally does not enter into our trachea. Why?
Answer. The food does not enter into trachea because during swallowing, the aperture leading to trachea (glottis) gets covered by a cartilaginous flap called epiglottis and the food has no other passage except going into the oesophagus.
 
Question. How would it affect the digestion of proteins and carbohydrates if the duodenum of man if there is a blockade in the pancreatic duct?
Answer. Duodenum is the region where the pancreatic juice secreted by the pancreas enters. The enzymes pancreatic amylase and trwsin helps in the digestion of carbohydrates and proteins. Thus, if there is a blockade, the digestion of carbohydrates and proteins gets affected.
 
Assertion and Reasoning Questions

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.

Question. Assertion: Human being has a complex respiratory system.
Reason: Human skin is impermeable to gases.

Answer : B

Question. Assertion: All proteins in our food are digested in small intestine only.
Reason: The protein digesting enzymes are released onto small intestine.

Answer : D

Question. Assertion: Human heart does not allow mixing of oxygen reach blood with carbon dioxide reach blood.
Reason: Human heart has different chambers.

Answer : A

Question. Assertion: When air is passed through lime water, lime water turns milky.
Reason: Air contains 78% nitrogen and 21% oxygen.

Answer : B

Question. Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.

Answer : A

 

Very Short Answer type Questions :

Question. Why is anaerobic respiration less efficient?
Answer: Anaerobic respiration is the incomplete breakdown of glucose and produces less energy, so it is less efficient.

Question. What do you mean by life processes?
Answer: Processes which perform maintenance job in our body.

Question. Define peristaltic movement? 
Answer: Peristaltic movement is defined as contraction and relaxation of muscles in the food pipe . which brings food down the pipe into the stomach.

Question. Name a unicellular organism which uses cilia to move food particles into its mouth.
Answer: Paramoecium.

Question. Name the longest part of the alimentary canal.
Answer: Small intestine.

Question. State the basic difference between the process of respiration and photosynthesis.
Answer: Respiration uses O2 and releases CO2 but in photosynthesis, CO2 is used and O2 is released.

Question. Name the muscle which regulates the exit of food from stomach to small intestine.
Answer: Sphincter muscle.

Question. In the experiment “Light is essential for photosynthesis”, why does the uncovered part of the leaf turn blue-black after putting iodine solution? 
Answer: Starch is produced in the uncovered part of the leaf due to photosynthesis which turns blue-black in presence of iodine solution.

Question. How does the acidic medium in the small intestine is converted into alkaline for pancreatic enzymes?
Answer: By the action of bile juice secreted by liver.

Question. Name the pigment present in human which aids in respiration.
Answer: Haemoglobin.

 

Short Answer Type Questions :

Question. What are the functions of lymph in our body?
Answer: Functions of lymph are
a)It returns tissue fluid from interstitial space into the blood.
b) It collects carbon dioxide, waste products and metabolites from tissues via tissue fluid.
c) Lymph has lymphocytes (WBC’S), the lymph provides in immunity to the body and fight against the invading organisms.

Question. How is haemoglobin associated with respiration explained?
Answer: Transportation of oxygen and carbon – dioxide occurs with the help of respiratory pigment haemoglobin. Haemoglobin is a red pigment having very high affinity for oxygen. Oxygen is transported from the lungs to the body cells in the form of oxyhemoglobin. Carbon – dioxide is transported from the body cells to the lungs in the form of carbamino – haemoglobin

Question. What are the modes of excretion in plants?
Answer: Modes of excretion in plants are –

a) The plants get rid of excess water by transpiration.

b) The only major gases excretory product of plants in oxygen. It is released from plants into the environment by diffusion.

c) Organic wastes of plants are stored within dead permanent tissues such as wood or within leaves or bark which are periodically removed.

d) The plants also excrete some wastes substances into the soil around them.

e) Many wastes products of plants are stored in cellular vacuoles.

Question. Give an experiment to prove the essentiality of light for photosynthesis
Answer: a) Destarched the plant by leaving it in dart for 48 – 72 hours.

b) Now place strips of black paper or metal foil over destarched leaves and expose them to light for several hours.

Question. What is “translocation”? Why it is essential for plants.
Answer: Transportation of organic solutes in the plants is called translocation. It is necessary, because all the cells need food to carry out their vital functions. It occurs in upward as well as downward direction or to the storage organs of roots, fruits, seeds and to growing organs.

Question. How respiration does takes place in plants?
Answer: There are three modes for the exchange of gases in plants –

a) Some small plants can carry out gaseous exchange by simple diffusion over their whole surfaces.

b) Large flowering plants exchange gases through stomata on their leaves and green stem.

c) In woody stems, exchange occurs through cracks in the bark or lenticels.

Question. How is transpiration pull responsible for upward movement of water?
Answer: The leaves loose water in the form of water vapours through stomata by a process known as transpiration. Continuous transpiration creates a s suction in the water column of the xylem elements and it reaches upto the roots. This pull is called transpiration pull. Due to transpiration, the water column of the plant is pulled up from below to the top of the plant.

Question. Discuss the major steps involved in process of nutrition in human beings.
Answer: Major steps involved in human nutrition are –

a) Ingestion – Intake of food through mouth. Humans have holozoic mode of nutrition. They engulf solid particles.

b) Digestion – The break down complex food material into simpler one in alimentary canal with the help of mechanical as well as chemical process.

c) Absorption – Digested food is absorbed by the small finger like projections, villi present in the small intestine.

d) Assimilation – Absorbed food reaches to all cells via blood, and utilized for energy, growth and development.

e) Excretion – Undigested food from small intestine passed into large intestine, and then it is thrown out by Anus.

Question. Discuss the mode of nutrition in amoeba.
Answer: Steps of Nutrition in amoeba –
a) Formation of pseudopodia – When Amoeba comes in contact with a food particle, it forms pseudopodia which envelops food particles.
b) Ingestion – The tips of pseudopodia fuse with each other, together with variable amount of food particles and water, forms food vacuole, this process is known as ingestion.
c) Digestion – The vacuoles are surrounded by lysosomes which fuses with vacuole and digest the food particles present in vacuole.
d) Exocytosis – The soluble products of digestion are passed out into due cytoplasm from the food vacuole.

And the remaining undigested materials are passed out of the body with the help of a process called exocytosis.

Question. With the help of labelled diagram, discuss the structure of cross – section of leaf.
Answer: Leaf has two parts:
(i) Epidermis – Outermost layer of cell is called epidermis. Lower epidermis has small pores in between cells called stomata.
(ii) Mesophyll – Parenchymatons cells containing chloroplast is called mesophyll. It is two types – palisade and spongy parenchyma.

Question. What do you mean by ‘lymph’. Mention its function.
Answer: Lymph- The fluid present in the spaces between the cells in the tissues is called tissue fluid or lymph.
Functions of lymph:
(i) It returns tissue fluid from the interstitial spaces into the blood.
(ii) Lymph capillaries of intestinal villi called lacteals helps in absorption of fats.
(iii) It collects carbondioxide, waste products and metabolites form tissues via tissue fluid.
 
Question. How are lungs designed in human beings to maximize the area of exchange of gases
Answer: Lungs have some adaptations in them so that efficient exchanges of gases take place. The adaptations are –
a) Increased surface area
b) Very fine and delicate surface for easy exchange of oxygen and carbon dioxide
c) Mechanism for moving the air in and out of respiratory surface where the oxygen is absorbed.
 
Question. Dark reaction of photosynthesis does not need light. Do plants undergo dark reaction at night explain.
Answer: Dark reaction does not mean that it occurs in the absence of light i.e., at night. Infact these reactions do not depend on light energy and occur simultaneously with light reaction.
 
Question. Differentiate inhalation and exhalation.
 
Question. With the help of diagram, show pulmonary circulation in man.
Answer: Diagram – Pulmonary circulation in man.
 
Question. What are the functions of human respiratory system?
Answer: (i) Gaseous exchange for the cellular respiratory process.
(ii) Sound production by vocal cords
(iii)Abdominal compression which helps in urination, passing of faces and childbirth.
(iv) Laughing and sneezing for self-cleaning the respiratory surface.
 
Question. What is role of skin, lungs and intestine in the process of excretion in man?
Answer: Skin – Skin excrete excess salts and water in the form of sweat.
Lungs – Lungs expel carbon – dioxide during exhalation.
Intestine – Intestine throw out undigested food in the form of faeces through anus 
 
Question. Explain the structure of chloroplast.
Answer: Fig – structure of chloroplast.
 

Q. 1 While eating you are advised not to talk. Why are you advised so? 1 Mark

Ans. We are advised so because while eating some food particles might enter the wind pipe which  an lead to choking.

Q. 2 We say that movement is a characteristic of living organisms but we always don’t see visible movements in plants. Comment. 1 Mark

Ans. We always don’t see visible movements in plants. It does not mean that they are not alive.  olecular movements take place in their body.

Q. 3 If a person is working on a treadmill in a gymnasium, will it effect his rate of breathing? How? 2 Marks

Ans. Yes, it will affect his rate of breathing. The rate of breathing will become fast to supply more oxygen to meet the increased demand of energy. 

Q. 4 If you compare your rate of breathing by feeling your chest movement with the number of times a fish opens and closes its mouth. Which will be higher and why? 2 Marks

Ans. The number of times a fish opens and closes its mouth will be higher as the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air. Therefore, rate of breathing in aquatic organisms is much faster than in terrestrial organisms.

Q. 5 Mucus is not used for churning the food or digesting it. Then why is it secreted in the stomach? 2 Marks

Ans. Mucus is secreted in the stomach to protect its inner lining from being damaged by HCl. Excessive secretion of HCl can damage the lining and lead to peptic ulcer.

Q. 6 In the process of Photosynthesis food A is prepared which gets converted into food B. What are A and B? Why is A converted to B? 2 Marks

Ans. Food A is glucose and food B is Starch. A is converted to B as B is insoluble form of carbohydrate. It is more compact and hence, suitable for storage.

Q. 7 When we are asleep we are not performing any activity still our life processes are going on. Why? 2 Marks

Ans. “The maintenance functions of living organisms must go on even when they are not doing anything particular.” That is why the life processes are going on even while we are asleep or not performing any activity.

 

QUESTION BANK FOR PRACTICE

1. Which fluid in the human body wets the internal organs?

2. Where does the blood absorb oxygen in the human body?

3. Name the two parts of the plant through which gaseous waste products are released into the air?

4. Why do the walls of the trachea not collapse when there is less air in it?

5. Normally a vein opens into a large vein or into the heart but does not end in capillaries. Which one or more veins in humans is/are exceptions to this rule?

6. Give reason for – The lung alveoli are covered with blood capillaries.

7. Why is blood called liquid connective tissue?

8. Structure of leaf is complementary to its functions. Explain.

9. Bile juice does not contain any digestive enzymes, yet it is essential for digestion, why so? Explain.

10. How do each of the following factors affect the productivity in the process of photosynthesis?
1. Temperature. 2. Water. 3. Carbon dioxide.

11. Why is it necessary to separate oxygenated and deoxygenated blood in living organisms?

12. What substance/substances are transported in plants by (1) Xylem vessels and tracheids?
(2) Sieve tubes (of phloem)?

13. Why is the inner wall of alimentary canal not digested although the digestive enzymes can digest all the materials that make cells?

14. Explain why the rate of photosynthesis in plants is low both at low and high temperatures?

15. Why is CO2 mostly transported in the dissolved form in our blood than O2?

16. Small intestine in the site for complete digestion of carbohydrates, proteins and fats. Write down the changes happen to the food in the small intestine before its absorption.

17. Plants absorb water from the soil. How does this water reach the tree tops?
Explain in detail.

18. Where does aerobic break down of pyruvate take place in a living cell? What are the end products?

19. Hydrochloric acid creates an acidic medium which facilitate the action of protein digesting enzyme in the stomach. Name the enzyme and give any three
other functions served by the acid.

20. Why is anaerobic respiration produce less energy compared to aerobic respiration?

21. What is root pressure?

22. In which direction does lymph flow?

23. Name the organ system which is responsible for excretion and osmoregulation?

24. What is the composition of lymph?

25. Differentiate between afferent and efferent arterioles?

26. Name the vestigial part of human alimentary canal.

27. Name the respiratory pigment of blood in mammals.

28. How does oxygen reach the cells in insects?

29. Respiration is a vital process for all organisms. Explain.

30. What will happen if a diaphragm of a person gets ruptured in an accident?

31. What is the source of oxygen in photosynthesis?

32. How would non-secretion of hydrochloric acid in our stomach affect food digestion?

33. Why does leaf appear green?

34. What is the role of light in photosynthesis?

35. Write about the major glands associated with the alimentary canal of man and mention their functions.

36. How does the butter in your food get digested and absorbed in the body and explain.

37. Why is the rate of photosynthesis more during a bright sunny day as compared to a cloudy day?

38. If all the green plants are removed from the earth life cannot be sustained.

39. Why is digestion essential for living beings?

40. Draw a diagram to show the internal structure of human heart. Label 6 parts in all including at least three valves.

1. Is the food vacuole of amoeba temporary structure or permanent structure? 

2. A T P is the energy currency of the cell. Do you agree with the statement? 

3. We are gifted to have haemoglobin as oxygen carrier and not diffusion. Do you agree with the statement if so, why? 

4. Anshu is fond of eating chocolates but her father advices to brush the teeth after eating them. What is the reason? 

5. If there were no algae, there would be no fish in the sea. Comment on this statement.

6. Why don’t the lungs collapse even after forceful expiration? 

7. A certain tissue in a green plant somehow gets blocked and the leaves wilted. What was the tissue that got blocked? 

8. Why enzymes are in active form even when there is no food in our stomach?

9. Is leaf fall related to excretion? How?

10 . What advantage does a terrestrial organism have over an aquatic organism with regard to obtaining oxygen for respiration? 

11. The two openings of the pharynx, one leading to trachea and the other leading to oesophagus, lie very close to each other. Yet food we swallow normally does not enter into
our trachea. Why? 

12. Normally a vein opens into a large vein or into the heart but does not end in capillaries.
Which one or more veins in human are exceptions to this rule? 

13. Why is the inner wall of the alimentary canal not digested although the digestive enzymes can digest all the materials that make cells? 

14. Why is carbon-di-oxide mostly transported in the dissolved form in our blood than oxygen?

Chapter 01 Chemical Reactions and Equations
CBSE Class 10 Science HOTs Chemical Reactions and Equations
Chapter 03 Metals and Non-Metals
CBSE Class 10 Science HOTs Metals and Non Metals
Chapter 05 Periodic Classification of Elements
CBSE Class 10 Science HOTs Periodic Classification of Elements
Chapter 08 How do the Organisms Reproduce
CBSE Class 10 Science HOTs Question How Do Organisms Reproduce
Chapter 10 Light Reflection and Refraction
CBSE Class 10 Science HOTs Reflection and Refraction
Chapter 13 Magnetic Effect of Electric Current
CBSE Class 10 Science HOTs Magnetic Effects of Electric Current
Chapter 16 Sustainable Management of Natural Resources
CBSE Class 10 Science HOTs Question Management of Natural Resources
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CBSE Class 10 Science HOTs Question Bank

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