CBSE Class 10 Science Life Processes Worksheet

Read and download free pdf of CBSE Class 10 Science Life Processes Worksheet. Students and teachers of Class 10 Science can get free printable Worksheets for Class 10 Science Chapter 6 Life Processes in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 10 students should practice questions and answers given here for Science in Class 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests

Worksheet for Class 10 Science Chapter 6 Life Processes

Class 10 Science students should refer to the following printable worksheet in Pdf for Chapter 6 Life Processes in Class 10. This test paper with questions and answers for Class 10 will be very useful for exams and help you to score good marks

Class 10 Science Worksheet for Chapter 6 Life Processes

Question. Where are proteins first digested in the alimentary canal?
(a) Small intestine
(b) Oesophagus
(c) Mouth
(d) Stomach
 
Answer :  D
 
Question.  Which of the following element is essential for the formation of protein
(a) N
(b) Ca
(c) Na
(d) Fe
 
Answer : A
 
Question. The kidneys in human beings are a part of the system for
(a) nutrition.
(b) respiration.
(c) excretion.
(d) transportation.

Answer : C

Question. The xylem in plants are responsible for
(a) transport of water.
(b) transport of food.
(c) transport of amino acids.
(d) transport of oxygen.

Answer : A

Question. The autotrophic mode of nutrition requires
(a) carbon dioxide and water.
(b) chlorophyll.
(c) sunlight.
(d) all of the above.

Answer : D

Question. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm.
(b) mitochondria.
(c) chloroplast.
(d) nucleus.

Answer : B

Question. Structural and functional unit of kidney is:
(a) Nephron
(b) Ureter
(c) Neuron
(d) Urethra
 
Answer : A
 
Question. A leaf from a destarched plant is covered with black paper strip as shown in figure 1. The starch test is done on the leaf after 8 hours.
 
 

S-1

The result will be as shown in diagram. 

1. D
2. C
3. A
4. B
 
Answer : B
 

Question. Which is main form in which CO2 is transported by blood ? 
(a) Carbonic acid
(b) Oxyhaemoglobin
(c) Carboxyhaemoglobin
(d) Bicarbonates

Answer: D

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

Answer: B

Question. The exchange of gases in the alveoli of the lungs takes place by :- 
(a) Osmosis
(b) simple diffusion
(c) Passive transport
(d) Active transport

Answer: B

Question. Blood is red in :- 
(a) Cockroach
(b) Housefly
(c) Mosquito
(d) None of these

Answer: D

Question. During inspiration 
(a) the diaphragm is lowered
(b) the diaphragm is lowered and ribs are raised
(c) the diaphragm and ribs are lowered
(d) the ribs are lowered and diaphragm is raised.

Answer: B

Question. During digestion of food in the alimentary canal, protein is acted upon by enzymes in the following sequence: 
(a) pepsin, trypsin and peptidase
(b) peptidase, trypsin and pepsin
(c) ptyalin, trypsin and peptidase
(d) ptyalin, pepsin and trypsin.

Answer: A

Question. The blood vessel of frog which opens in its right auricle bringing oxygenated blood is :- 
(a) Pulmocutaneum artery
(b) Inferior vena cava
(c) Pulmocutaneum vein
(d) Superior vena cava

Answer: C

Question. The two places in the alimentary canal where carbohydrates are digested are 
(a) mouth and intestine
(b) stomach and duodenum
(c) large intestine and ileum
(d) mouth and stomach.

Answer: A

Question. The respiratory centres, which control inspiration and expiration, are located in :- 
(a) Cerebellum
(b) Diencephalon
(c) Medulla oblongata
(d) Spinal cord

Answer: C

Question. Which blood type is a universal donor ? 
(a) A
(b) B
(c) O
(d) AB

Answer: C

Question. The exchange of gases between the external air and the blood occurs in the: 
(a) bronchus
(b) bronchiole
(c) trachea
(d) alveoli.

Answer: D

Question. Blood from superior vena cavaflows into :- 
(a) Right atrium
(b) Right ventricle
(c) Left atrium
(d) Left ventricle

Answer: A

Question. Renal portal system is absent in :- 
(a) Birds
(b) Reptiles
(c) Amphibians
(d) Reptiles and amphibians

Answer: A

Question. Site of respiration in bacteria is :- 
(a) Episome
(b) Mesosome
(c) Ribosome
(d) Microsome

Answer: B

Question. Which of the following is helpful for erythropoeisis :- 
(a) Fe++
(b) Mg++
(c) Ca++
(d) Cu++

Answer: A

Question. In which of the three groups of the following mammals is uric acid also excreted out :- 
(a) Carnivora, insectivora and marsupials
(b) Elephants, chiroptera, primates
(c) Logomorpha, man, horse
(d) Man, apes, dalmatian dog

Answer: D

Question. Dialysis is carried out in case:- 
(a) both kidneys are damaged
(b) brain and spinal cord are damaged
(c) heart and lungs are damaged
(d) liver and spleen do not function

Answer: A

Question. On a slide a drop of anti B serum is placed and then a drop of blood of unknown type is added to it. The blood cells do not clump. The blood type is :- 
(a) A or O
(b) B or AB
(c) AB or A
(d) O or B

Answer: A

Question. The major effect of hyperventilation is 
(a) increased oxygen in the blood
(b) decreased carbon dioxide in the blood
(c) increased carbon dioxide in the blood
(d) decreased oxygen in the blood

Answer: B

Question. Liver is an important gland of the body. In addition to its function in digestion and food storage, the liver participates in excretion. Which of the following function(s) :- 
(a) Deamination and urea formation
(b) Elimination of haemoglobin and bile salts
(c) Inactivation of chemicals after their role is over
(d) All the three mentioned above

Answer: D

Question. Heamoglobin is having maximum affinity with :- 
(a) NH3
(b) O2
(c) CO
(d) CO2

Answer: C

Question. Which of the following characteristics are of the leucocytes (white blood cells) :- 
(a) They are nucleated and can move from place to place by amoeboid movements
(b) They (granulocytes) kill bacteria
(c) They (lymphocytes) produce antibodies
(d) All of the above

Answer: D

Question. Lymph is pushed along its path in lymph vessels :- 
(a) by pumps present in lymph nodes
(b) by valves present in lymph vessels
(c) by the contraction of voluntary muscles present on either side of lymphvessels
(d) by the involuntary muscles present along with lymph vessels

Answer: C

Question. In a 70 kg man, kidneys, liver, heart and brain weigh 3.5 kg and skin, muscles and remaining organs weight 66.5 kg. Out of the total cardiac output of 5.6 litres per minute, the first four organs, namely kidneys, liver, heart and brain, receive 3.6 litres while the remaining organs of the body receive 2.0 litres of blood. The reason for the kidneys, liver, heart and brain receiving more than half the total cardiac output can be that :- 
(a) they are big organs
(b) they are located in the centre of the body
(c) they are compact organs
(d) they are most active organs and majority of the cells work almost 24 hours

Answer: D

Question. The blood proteins involved in blood clotting are :- 
(a) gamma globulin and haemoglobin
(b) prothombin and fibrinogen
(c) albumin and prothrombin
(d) collagen and fibrinogen

Answer: B

Question. A blood vessel which has thick strong muscular wall is :- 
(a) artery
(b) vein
(c) capillary
(d) lacteal

Answer: A

Question. The backward flow of blood in the veins is prevented by the presence of :- 
(a) thin walls
(b) thick walls
(c) heart beat
(d) valves

Answer: D

Question. Which of the following colours of light in the visible spectrum is the most efferctive in photosynthesis ? 
(a) Red
(b) Green
(c) Violet
(d) Yellow

Answer: A

Question. The chlorophylls absorb mostly :- 
(a) Blue and green light
(b) Blue and red light
(c) Green and red light
(d) Green light

Answer: B

Question. Vitamin K is useful for :- 
(a) Converting prothrombin to thrombin
(b) Synthesis of prothrombin
(c) Calcium combination with prothrombin
(d) All of these

Answer: B

Question. The walls of right ventricle are less muscular as compared to the left ventricle because :- 
(a) the right ventricle receives blood from the body
(b) the right ventricle sends blood to the head
(c) the right ventricle pumps blood to the lungs
(d) the right ventricle pumps blood to the alimentary canal

Answer: C

Question. Entire haemoglobin of blood becomes oxidised while it goes out of lung and it relieves oxygen in body tissues, because :- 
(a) Of reduction of oxyhaemoglobin
(b) In comparison to lung, tissues have high conc. of CO2
(c) Tissues can absorb oxygen from haemoglobin
(d) Tissues have high conc. of O2 and low conc. of CO2

Answer: B

Question. The most stable product formed with haemoglobin is by :- 
(a) CO2
(b) O2
(c) CO
(d) SO2

Answer: C

Question. Mountain sickness results due to 
(a) anaemic hypoxia
(b) arterial hypoxia
(c) lack of sufficient RBCs
(d) lack of sufficient WBCs

Answer: B

Question. As blood flows out of a damaged blood vessel, blood platelets release a substance called :- 
(a) Thrombin
(b) Prothrombin
(c) Thromboplastin
(d) Fibrin

Answer: C

Question. Conversion of fibrinogen to fibrin is catalysed by :- 
(a) Thrombin
(b) Prothrombin
(c) Thromboplastin
(d) All of these

Answer: A

Question. The pH value of blood varies between :- 
(a) 6.00–7.00
(b) 7.00–8.00
(c) 7.30–7.45
(d) 7.50–8.00

Answer: C

Question. Body tissues obtain oxygen from haemoglobin because of its dissociation in tissues caused by 
(a) low oxygen concentration and high carbon dioxide concentration
(b) low oxygen concentration
(c) low carbon dioxide concentration
(d) high carbon dioxide concentration

Answer: B

Question. Which of the following enzyme acts efficiently at pH two? 
(a) Trypsin
(b) Pepsin
(c) Ptyalin
(d) All of the above

Answer: B

Question. If a cell membrane shrinks after being placed in a solution, it is :- 
(a) hypotonic
(b) hypertonic
(c) isotonic
(d) normal

Answer: B

Question. The diagram represents a section through the small intestine.
CBSE Class 10 Science Life Processes Worksheet_4
What is the role of the structure labelled X ?
(a) They help to move the food along
(b) They make a large surface area for absorption
(c) They protect against bacteria
(d) They move mucus over the surface

Answer : B 

Question. Major function of contractile vacuole is:
(a) Excretion
(b) Circulation
(c) Osmoregulation
(d) All the above

Answer : C 

Question. Villi present on the internal wall of intestine help in the
(a) emulsification of fats
(b) breakdown of proteins
(c) absorption of digested food
(d) digestion of carbohydrates

Answer : C 

Question. Which of the following structures is involved in gaseous exchange in woody stem of a plant?
(a) Stomata
(b) Lenticel
(c) Guard cell
(d) Epidermis

Answer : B 

Question. The diagram shows part of the human gas exchange system.
CBSE Class 10 Science Life Processes Worksheet_7

Answer : D 

Question. The diagram shows the arrangement of cells inside the leaf of a green plant. (No cell contents are shown). Which cells normally contain chloroplasts?
CBSE Class 10 Science Life Processes Worksheet_1
(a) 1 and 2
(b) 1 and 4
(c) 2 and 3
(d) 2 and 4

Answer : D  

Question. In the cardiac cycle, diastole is:
(a) The number of heart beats per minute
(b) The relaxation period after contraction of the heart
(c) The forceful pumping action of the heart
(d) The contraction period after relaxation of the heart.

Answer : B 

Question. From which structure, the free oxygen gas produced during photosynthesis is released?
(a) Epidermis
(b) Stomata
(c) Cortex
(d) Guard cell

Answer : B 

Question. In photosynthesis, which substances are used up, which are produced and which are necessary, but remain unchanged after the reaction?
CBSE Class 10 Science Life Processes Worksheet_6

Answer : D 

Question. What is the mode of nutrition in fungi?
(a) Autotrophic
(b) Heterotrophic
(c) Saprophytic
(d) Parasitic

Answer : C 

Question. A plant is kept in the dark for two days. A leaf is used in an experiment to investigate the effect of two factors on photosynthesis as shown in the diagram.
CBSE Class 10 Science Life Processes Worksheet_3

Answer : B 

Question. Instrument used to measure blood pressure is
(a) barometer
(b) potometer
(c) thermometer
(d) sphygmomanometer

Answer : D 

Question. Vocal cords occur in:
(a) pharynx
(b) glottis
(c) bronchial tube
(d) larynx

Answer : D 

Question. When a person eats some egg white, proteins and water enter the stomach. Which substances are found leaving the stomach and leaving the small intestine?
CBSE Class 10 Science Life Processes Worksheet_5

Answer : D 

Question. In which order do these events occur in human nutrition?
(a) Digestion → ingestion → absorption → assimilation
(b) Digestion → ingestion → assimilation → absorption
(c) Ingestion → digestion → absorption → assimilation
(d) Ingestion → digestion → assimilation → absorption

Answer : C 

Question. Blood vessel carry blood from lungs to heart through:
(a) Pulmonary artery
(b) Pulmonary vein
(c) Coronory artery
(d) None of these

Answer : B 

Question. Which cell organelle is involved in breakdown of glucose to produce energy for metabolic activities?
(a) Mitochondria
(b) Chloroplast
(c) Endoplasmic reticulum
(d) Golgi body

Answer : A 

Question. What is the final product of photosynthesis?
(a) Protein
(b) Fat
(c) Starch
(d) Mineral salt

Answer : C 

Question. Choose the forms in which most plants absorb nitrogen:
1. Proteins
2. Nitrates and nitrites
3. Urea
4. Atmospheric nitrogen
Choose the correct option.
(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 1 and 4

Answer : B 

Question. The following changes take place in an athlete’s body during a 100 m race. Which change occurs first?
(a) Increased availability of oxygen to muscles
(b) Increased breathing rate
(c) Increased carbon dioxide concentration in the blood
(d) Increased production of carbon dioxide by muscles

Answer : D 

Question. How many pairs of salivary glands are found in humans?
(a) Two
(b) Three
(c) Six
(d) Four

Answer : B 

Question. Which substances are produced by anaerobic respiration in yeast?
CBSE Class 10 Science Life Processes Worksheet_2

Answer : A 

Question. Only two of the following Statements accurately describe what happens in the mouth.
1. Amylase breaks down large starch molecules into smaller maltose molecules.
2. Chewing increases the surface area of food for digestion.
3. Saliva emulsifies fats into smaller droplets.
4. Teeth breakup large insoluble molecules into smaller soluble molecules. 
which statements are correct?
(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 1 and 4

Answer : A 

Question. During vigorous physical exercise, lactic acid is formed from glucose inside the muscle cells because
(a) there is lack of oxygen
(b) there is lack of water
(c) there is excess of carbon dioxide
(d) none of the above

Answer : A 


 

Very Answer Type Questions

Question. Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
Answer :  Unlike the unicellular organisms, the multi-cellular organisms have complex body structures with specialized cells and tissues to perform various necessary functions of the body. Since these cells are not in direct contact with surrounding environment so, simple diffusion cannot meet the oxygen requirement of all these cells.

Question. Bil
e juice does not have any digestive enzyme but still plays a significant role in the process of digestion. Justify the statement.

Answer :  Bile juice makes the food alkaline for the action of Trypsin. Bile salts break the large globules of fat. 

Question. Which are material required for setting up an experiment to show that light is necessary for photosynthesis? 
Answer : A healthy potted plant, a petri dish, a beaker containing water, forceps, a water bath, a piece of wire gauze, a tripod, a burner, a box of matches, alcohol a strip of black paper, iodine solution and clips. 

Question. What processes would you consider essential for maintaining life?
Answer :  Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for maintaining life. 

Question. What criteria do we use to decide whether something is alive?
Answer : Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not. 

Question. Why carbon dioxide is mostly transported in dissolved form? 
Answer : Carbon dioxide is more soluble in water than oxygen that's why it is transported in soluble form.

Question. Name the first digestive organ that is associated with the breakdown of proteins in humans. What are its three releases?
Answer : The first digestive organ in humans is the stomach. It releases proteolytic enzymes, HCl and mucus.

Question. Name the component of blood that helps in the formation of blood clot in the event of a cut.
Answer : Platelets help in clotting of blood in the event of a cut.

Question. Give one reason why multicellular organisms require special organs for exchange of gases between their body and their environment. :
Answer : In unicellular organisms the entire body of the organism is in contact with the environment hence exchange of materials can take place but, in multicellular organisms the entire body of the organism is not in contact with the environment and hence simple diffusion is not helpful.

Question. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Answer : The amount of oxygen dissolved in water is very low, as compared to amount of oxygen in air. Thus, terrestrial organism has to make less efforts to obtain oxygen than an aquatic organism to obtain oxygen for respiration.

Question. How is carbon dioxide obtained by (a) aquatic plants and (b) terrestrial plants ?
Answer : (a) Aquatic plants take up carbon dioxide dissolved in water.
(b) Terrestrial plants use carbon dioxide present in air.

Question. What is‘translocation’in plants?
Answer : Translocation is the movement of soluble materials, products of photosynthesis from leaves to other tissues throughout the plant.

Question. Name the two ways in which glucose is oxidised to provide energy in various organisms.
Answer : The two ways in which glucose is oxidised to provide energy in various organisms are aerobic respiration pathway which uses oxygen to break-down glucose completely into carbon dioxide and water and some use other pathways that do not involve oxygen which is called anaerobic respiration pathway.

Question. Specify two conditions in which photo-respiration may take place in green plants.
Answer : Two conditions in which photorespiration may take place in green plants are: (i) High concentration of oxygen and (ii) High temperature

Question. Describe the mechanism of blood clotting.
Answer : Blood Clotting: It is the mechanism that prevents the loss of blood at the site of an injury or wound by forming a ‘blood clot’. The blood has platelet cells which circulate around the body and plug these leaks by helping to clot the blood at these points of injury to prevent it from excessive bleeding.

Question. Which part of the human heart is considered as pace-maker? Why is it so called?
Answer : Sino-atrial node of the human heart is considered as pacemaker. Sino-atrial node is also called as pacemaker because it determines the rate of heartbeat by determining the rate of discharge of cardiac impulse.

Question. Which enzyme initiates the digestion of proteins ? Name the other enzyme produced by the same gland.
Answer : The enzyme gastric pepsin initiates the digestion of proteins. The other enzyme produced by the stomach is gastric lipase.

Question. Where does digestion of fat take place in our body?
Answer : Digestion of fat takes place in the small intestine of our body.

Question. State any one difference between autotrophic and heterotrophic modes of nutrition.
Answer : In autotrophic nutrition, organisms obtain their food from inorganic substances. In heterotrophic nutrition, organisms derive their food from organic substances.

Question. Why do the walls of the trachea not collapse’when there is less air in it?
Answer : Rings of cartilages are present in trachea. These rings support the trachea and do not allow the trachea to collapse when there is less air in it.

Question. How would digestion of food be affected if the bile duct is completely blocked? Explain.
Answer : If the bile duct is completely blocked, bile juice will not reach the small intestine and the digestion of fats will be affected.

Question. Name one accessory pigment and one essential pigment in photosynthetic plants.
Answer : Accessory pigment – Carotene/Xanthophyll
Essential pigment – Chlorophyll

 

Short Answer Type Questions

Question. What are outside raw materials used for by an organism?
Answer : Various outside raw materials used by an organism are as follows:
→ Food as source of supplying energy and materials.
→ Oxygen for breakdown of food to obtain energy.
→ Water for proper digestion of food and other functions inside the body.
The raw materials required by an organism will vary depending on the complexity of the organism and its environment. 

Question. Write any two functions of large intestine in man
Answer : Functions of large intestine in man are:
(i) It serves to store the unabsorbed food remnants temporarily.
(ii) It concentrates the contents by absorbing water.
(iii) The movements of colon help to void the faeces through anus.

Question. Draw a neat labelled diagram of the structure of a chloroplast. 
Answer :

""CBSE-Class-10-Science-Life-Processes-2

Question. Write correct sequence of four steps of method for the preparation of temporary mount of a stained leaf peel.
Answer : • Take a healthy leaf from the potted plant.
• Remove a part of the peel from the lower surface of the leaf. You can do this by folding the leaf over and gently pulling the peel apart using forceps. Keeps the peel in a watch glass containing water.
• Put a few drops of safranin stain in a watch glass.
• After 2-3 minutes take out the peel and place it on a clean glass slide.
• Put a drop of glycerin over the peel and place a clean covers lip gently over it with the help of a needle.
• Remove the excess stain and glycerin with the help of blotting paper.
• Observe the slide under magnifications of the compound microscope.

Question. Draw a diagram of human excretory system and label kidneys, ureters on it.
Answer :

""CBSE-Class-10-Science-Life-Processes-3

Question. State two differences between arteries and veins.
Answer : Arteries: Arteries carry oxygenated blood, away from the heart except pulmonary artery. These are thick-walled, highly muscular except arteries of cranium and vertebral column.
Valves are absent. Blood in arteries moves with pressure.
Veins: Veins carry deoxygenated blood, towards the heart except pulmonary veins. These are thin-walled. Valves are present which provide unidirectional flow of blood. 
Blood in veins moves under very low pressure.

Question. In mammals and birds why is it necessary to separate oxygenated and de-oxygenated blood?
Answer : Mammals and birds are warm blooded animals. This means they can control their body temperature and do not have to depend on environment for their body temperature regulation. Because of this birds and mammals require optimum oxidization of glucose which would be possible with good supply of oxygen. So it is required to have separate oxygenated and deoxygenated blood to supply the required amount of oxygen.

Question. Where do plants get each of the raw materials required for photosynthesis?
Answer : The following raw materials are required for photosynthesis:
→ Carbon Dioxide: Plants get CO2 from atmosphere through stomata.
→ Water: Plants absorb water from soil through roots and transport to leaves.
→ Sunlight: Sunlight, which is absorbed by the chlorophyll and other green parts of the plant.

Question. What is the role of the acid in our stomach?
Answer : Following are the roles of acid in our stomach:→ The hydrochloric acid present in our stomach dissolves bits of food and creates an acidic medium. In this acidic medium, enzyme pepsinogen is converted to pepsin, which is a protein-digesting enzyme.
→ It also kills many bacteria and other microorganisms that enter alongwith the food.

Question. What is the function of digestive enzymes?
Answer : Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body.

Question. How is the small intestine designed to absorb digested food?
Answer : The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food absorption. Within these villi, many blood vessels are present that absorb the digested food and carry it to the blood stream.
From the blood stream, the absorbed food is delivered to each and every cell of the body.

""CBSE-Class-10-Science-Life-Processes-Worksheet-2

Question. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Answer : Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O2 as compared to water. Since the content of O2 in air is high, the terrestrial animals do not have to breathe faster to get more oxygen. Therefore, unlike aquatic animals, terrestrial animals do not need adaptations for gaseous exchange.

Question. What are the different ways in which glucose is oxidized to provide energy in various organisms?
Answer : At first glucose (6 carbon molecules) is broken in the cytoplasm of cells of all organisms.
This process yields a 3 carbon molecule compound called pyruvate.
Further break down of pyruvate takes place in different manners in different organisms.

""CBSE-Class-10-Science-Life-Processes-Worksheet-1

→ Anaerobic Respiration: This process takes place in absence of oxygen, e.g. in yeast during fermentation. In this case pyruvate is converted into ethanol and carbon dioxide.
→ Aerobic Respiration: In aerobic respiration, breakdown of pyruvate takes place in presence of oxygen to give rise 3 molecules of carbon dioxide and water. The release of energy in aerobic respiration is much more than anaerobic respiration.
→ Lack of Oxygen: Sometimes, when there is lack of oxygen, especially during vigorous activity, in our muscles, pyruvate is converted into lactic acid (3 carbon molecule compounds). Formation of lactic acid in muscles causes cramp.

Question. How is oxygen and carbon dioxide transported in human beings?
Answer : → Transport of Oxygen: The respiratory pigments (haemoglobin) present in red blood  cells takes up the oxygen from the air to the lungs. They carry the oxygen to tissues which are deficient in oxygen.
→ Transport of carbon dioxide: Carbon Dioxide is more soluble in water. Hence, it is mostly transported from body tissues in the dissolved form in our blood plasma to lungs where it diffuses from blood to air in the lungs and then expelled out through nostrils.

Question. How are the lungs designed in human beings to maximize the area for exchange of gases?
Answer : Lungs contain millions of alveoli which provide a surface for the exchange of gases. An extensive network of blood vessels is present in the wall of the alveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into the lungs and alveoli. The oxygen from the breath, diffuses into the blood and CO2 from the blood brought from the body, diffuses out into the air.

Question. What are the components of the transport system in human beings? What are the functions of these components?
Answer : The main components of the transport system in human beings are the heart, blood, and blood vessels.
→ Heart pumps oxygenated blood throughout the body. It receives deoxygenated blood from the various body parts and sends this impure blood to the lungs for oxygenation.
→ Blood helps in the transport of oxygen, nutrients, CO2, and nitrogenous wastes.
→ The blood vessels (arteries, veins, and capillaries) carry blood either away from the heart to various organs or from various organs back to the heart.

Question. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Answer : It is necessary to separate oxygenated and deoxygenated blood to maintain efficient supply of oxygen into the body. This system is essential in animals that have high energy need. For example, animals like mammals and birds which constantly use this energy to maintain their body temperature.

Question. What are the components of the transport system in highly organised plants?
Answer : In highly organised plants, there are two different types of conducting tissues - xylem and phloem. Xylem conducts water and minerals obtained from the soil (via roots) to the rest of the plant. Phloem transports food materials from the leaves to different parts of the plant body.

Question. How are water and minerals transported in plants?
Answer : Water and minerals are transported through xylem cells from soil to the leaves. The xylem cells of roots stem and leaves are interconnected to form a conducting channel that reaches all parts of the plant. The root cells take ions from the soil. This creates a difference between the concentration of ions of roots and soil. Therefore, there is a steady movement of water into xylem. An osmotic pressure is formed and water and minerals are transported from one cell to the other cell due to osmosis. The continuous loss of water takes place due to transpiration. Because of transpiration, a suction pressure is created as a result of which water is forced into the xylem cells of roots. The effect of root pressure for transportation in plants is more important in night while during day time transpiration pull becomes the major driving force.

Question. How is food transported in plants?
Answer : Phloem transports food materials from the leaves to different parts of the plant. The transportation of food in phloem is achieved by utilizing energy from ATP which helps in creating osmotic pressure that transport food from the area of high concentration to low concentration.

Question. Describe the structure and functioning of nephrons.
Answer : Nephrons are the basic filtering units of kidneys. Each kidney possesses large number  of nephrons, approximately 1-1.5 million. The main components of the nephron are glomerulus, Bowman's capsule, and a long renal tubule.

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Functioning of a nephron:
→ The blood enters the kidney through the renal artery, which branches into many capillaries associated with glomerulus.
→ The water and solute are transferred to the nephron at Bowman's capsule.
→ In the proximal tubule, some substances such as amino acids, glucose, and salts are selectively reabsorbed and unwanted molecules are added in the urine.
→ The filtrate then moves down into the loop of Henle, where more water is absorbed.
→ From here, the filtrate moves upwards into the distal tubule and finally to the collecting duct. Collecting duct collects urine from many nephrons.
→ The urine formed in each kidney enters a long tube called ureter. From ureter, it gets transported to the urinary bladder and then into the urethra.

Question. What are the methods used by plants to get rid of excretory products?
Answer : Plants can get rid of excess of water by transpiration. Waste materials may be stored in the cell vacuoles or as gum and resin, especially in old xylem. It is also stored in the leaves that later fall off.

Question. How is the amount of urine produced regulated?
Answer : The amount of urine produced depends on the amount of excess water and dissolved wastes present in the body. Some other factors such as habitat of an organism and hormone such as Anti-diuretic hormone (ADH) also regulates the amount of urine produced.

Question. How are fats digested in our bodies? Where does this process take place?
Answer : Fats are present in the form of large globules in the small intestine. The small intestine receives the secretions from the liver and the pancreas. The bile salts (from the liver) break down the large fat globules into smaller globules so that the pancreatic enzymelipase can easily act on them. This is referred to as emulsification of fats. This process takes place in the small intestine.

Question. What is the role of saliva in the digestion of food?
Answer : The role of saliva in the digestion of food:
→ It moistens the food for easy swallowing.
→ It contains a digestive enzyme called salivary amylase, which breaks down starch into sugar.

Question. What are the necessary conditions for autotrophic nutrition and what are its byproducts?
Answer : Autotrophic nutrition takes place through the process of photosynthesis. Carbon dioxide, water, chlorophyll pigment, and sunlight are the necessary conditions required for autotrophic nutrition. Carbohydrates (food) and O2 are the by-products of photosynthesis.

Question. What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
Answer : Aerobic respiration
• It occurs in the presence of O2.
• It involves the exchange of gases between the organism and the outside environment.
• It occurs in cytoplasm and mitochondria.
• It always releases CO2 and H2O
• It always releases CO2 and H2O
Anaerobic respiration
• It occurs in the absence of O2.
• Exchange of gases is absent
• It occurs only in cytoplasm.
• End products vary.
• End products vary.

Question. How are the alveoli designed to maximise the exchange of gases?
Answer : Alveoli provide a surface for the exchange of gases. An extensive network of blood vessels is present in the wall of the alveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into the lungs and alveoli. The oxygen from the breath, diffuses into the blood and CO2 from the blood brought from the body, diffuses out into the air.

Question. What would be the consequences of a deficiency of haemoglobin in our bodies?
Answer : Haemoglobin is the respiratory pigment that transports oxygen to the body cells for cellular respiration. Therefore, deficiency of haemoglobin in blood can affect the oxygen supplying capacity of blood. This can lead to deficiency of oxygen in the body cells. It can also lead to a disease called anaemia.

Question. Describe double circulation in human beings. Why is it necessary?
Answer : During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.

Question. What are the differences between the transport of materials in xylem and phloem?
Answer : Aerobic respiration
• Xylem tissue helps in the transport of water and minerals.
• Water is transported upwards from roots to all other plant parts.
• Transport in xylem occurs with the help of simple physical forces such as transpiration pull.
Anaerobic respiration
• Phloem tissue helps in the transport of food.
• Food is transported in both upward and downward directions 
• Transport of food in phloem requires energy in the form of ATP.

Question. Why is urine more concentrated in summers? 
Answer : In summers consumption of water is increased and despite that amount of urine excreted is less. This is because most of the water is excreted in the form of sweat which is evaporated soon due to high environmental temperature. It keeps our body cool and hence concentrated yellowish urine is excreted.

Question.(a)Mention any two components of blood.
(b)Trace the movement of oxygenated blood in the body.
(c)Write the function of valve present in between atria and ventricles.
(d) Differentiate between an artery and a vein.
Answer : (a)Plasma, red blood cells, white blood cells, platelets
(b)Lungs → left side of the heart → aorta → body organs
(c)Valve prevents back flow of blood.
(d)

Life Processes_12

Question. What are the differences between autotrophic nutrition and heterotrophic nutrition?
Answer :

 class_10_science_worksheet_05 

Question. What are the end products formed during fermentation in yeast? Under what conditions a similar process takes place in our body that leads to muscle cramps? 
Answer : The end products formed during anaerobic respiration or fermentation in yeast are carbon dioxide and ethanol along with ATP. A similar process in seen in our body when there is lack of oxygen in muscles, leading to the muscle fatigue. It results due to the accumulation of lactic acid produced during anaerobic respiration of glucose. The energy or ATP produced during anaerobic respiration is much less as compared to aerobic respiration. 
 

Question. Where do plants get each of the raw materials required for photosynthesis?
Answer :  The following raw materials are required for photosynthesis:
→ Carbon Dioxide: Plants get CO2 from atmosphere through stomata.
→ Water: Plants absorb water from soil through roots and transport to leaves.
→ Sunlight: Sunlight, which is absorbed by the chlorophyll and other green parts of the plant.

Question. Explain the process of nutrition in Amoeba.
Answer :

 

Life Processes_14

 
 

Long Answer Type Questions

Question. (a)Define excretion.
(b)Name the basic filtration unit present in the kidney.
(c)Draw excretory system in human beings and label the following organs of excretory system which perform following functions:
(i) form urine
(ii) is a long tube which collects urine from kidney.
(iii) store urine until is passed out
Answer : (a)Excretion: Process involved in removal of nitrogenous/harmful metabolic waste from the body.
(b)Basic filtration unit present in the kidney is nephron.
(c)Diagram of human excretory system:

Life Processes_13

 
Question. What are the components of transport system in human beings? What are function of these components? 
Answer : There are two main transport systems in human beings:
1) Blood vascular system.
2) Lymphatic system.
Components of blood vascular system
1. Blood: It is a reddish viscous fluid connective tissue. In an adult human being, it is 5-6 litres in amount. It is heavier than water and about five times thicker. Blood is slightly alkaline with a pH of 7.3-7.45. Blood consists of two parts – plasma and formed elements. (RBC, WBC and blood platelets)
2. Heart: It is a hollow, muscular pumping organ. Heart is very well protected by thoracic cage formed by ribs and muscles and a double walled transparent sac called pericardium. They cavity of pericardium, pericardial cavity is filled with pericardial fluid. It is shock absorbing and act as a lubricant so as to allow free frictionless movements.The heart in fact, has four water tight chambers, the receiving chambers called auricles or atria and the distributing chambers ventricles. The left half of the auricle receives purified blood from the lungs and empties into left ventricle. The left ventricle distributes blood to various organs and tissues through the blood vessels.
3. Blood vessels: The blood vessels which carry oxygenated blood are called arteries. The arteries on reaching the organ, divide into arterioles. They further divide to form capillaries of finer dimensions. Exchange of materials takes place
across the capillaries. It is possible because the walls of capillaries are extremely thin. The blood from the tissues is cleared by small venules which unite to form veins. Several veins from different organs join to form various vena cava.
Components of Lymphatic system
1. Lymph : Lymph is similar to blood but RBCs are absent in lymph.
2. Lymph vessels:
3. Lymph capillaries: Lymph is formed from the fluid which leaks from blood capillaries and goes to the intercellular spaces in the tissues.
4. Lymph nodes
 
Question. (i)Draw the diagram of cross section of a leaf and label the following parts:
(a)Cuticle (b) Chloroplast
(ii)A gas is released during photosynthesis. Name the gas and also state the way in which the gas is evolved.
(iii)In certain group of plants, stomata remain closed during day. How is food synthesized by such plants?
Also name them.
Answer : (i)

 Life Processes_11

(ii)Oxygen gas is evolved during photosynthesis. Oxygen gas is evolved by splitting of water
2H2O → 2H2 + O2
(iii)They take take up CO2 at night through stomata, which open during night and produce an intermediate organic acid which is acted upon by the energy absorbed by chlorophyll during the day and breaks up to release of CO2 .The CO2 so produced internally is used in photosynthesis during day when stomata are closed. Example-desert pant 

Question. Draw a diagram of human respiratory system and label on it :
(i) Diaphragm (ii) Larynx
Answer :

""CBSE-Class-10-Science-Life-Processes-21

Question. (a) Name the site of exchange of material between the blood and surrounding cells. (b) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide in human body.
Answer :
(a) Capillaries
(b)

""CBSE-Class-10-Science-Life-Processes-20

Question. List three characteristics of lungs which make it an efficient respiratory surface.
Answer : These features which particularly make our lungs efficient for gas exchange.
1.Thin: the air sac walls are very thin so that gases can quickly diffuse through them. Oxygen is absorbed in to the blood and carbon dioxide is given out in to the lungs to be exhaled out.
2.Moist: the air sacs are moist with mucus so that gases can dissolve before diffusing.
3.Large surface area: the surface area for gases to diffuse through in human lungs is roughly the same as a tennis court. The alveoli help to increase the surface area for absorption of oxygen.
4.Good blood supply: the air sacs or the alveoli have a large capillary network so that large volumes of gases can be exchanged. More the flow of blood more exchange.

Question. (a) What is the role of HCl in our stomach ?
(b) What is emulsification of fats ?
(c) Which protein digesting enzyme is present in pancreatic juice ?
Answer : (a)(i) It sterilises food by killing pathogens and other microbes.
(ii) It has a pH of 2, which is perfect for entyaus such as pepsin to break down proteins as effectively as possible.
(iii) Helps emulsify food (digestion of protein and stimulates the pancreas to produce digestive enzymes and bile) and protects against harmful ‘ bacteria
(b) Breakdown of large gloubule fats into smaller fats droplets is known as emulsification.
(c) Trypsin is the enzyme secreted by the pancreas which aids in digestion of proteins.

Question. List in tabular form three differences between arteries and veins.
Answer :

""CBSE-Class-10-Science-Life-Processes-19

Long Answer Type Questions

Question. (a) Draw a diagram of human respiratory system and label the following:
(i) part where air is filtered by fine hair and mucus
(ii) part which terminates in balloon – like structures
(iii) balloon – like structures where exchange of gases takes place.
(iv) part which separates 
chest cavity from abdominal cavity.
(b) Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?
Answer : (a)

""CBSE-Class-10-Science-Life-Processes-13
(b) Quantity of dissolved oxygen is fairly low in water as compared to the amount of oxygen in air. Aquatic organisms therefore have to breath faster than terrestrial organisms to absorb the required amount of oxygen from the water.

Question. (a) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label on it: Lung capillaries, Pulmonary artery to lungs, Aorta to body, Pulmonary veins from lungs.
(b) What is the advantage of separate channels in mammals and birds for oxygenated and deoxygenated blood?
Answer : (a) A schematic representation of transportation and exchange of oxygen and carbon dioxide during transportation of blood in human beings

""CBSE-Class-10-Science-Life-Processes-12

(b) It is necessary to separate oxygenated and deoxygenated blood in mammals and birds because they need high energy and large amount of oxygen. The separation of oxygenated and deoxygenated blood provides high oxygen supply to the organs.

Question. (a) Draw a diagram depicting Human Alimentary Canal and label on it: Gall bladder, Liver and Pancreas.
(b) State the roles of Liver and Pancreas.
(c) Name the organ which performs the following functions in humans:
(i) Absorption of digested food
(ii) Absorption of water.
Answer : (a)

""CBSE-Class-10-Science-Life-Processes-11
(b) Liver: It synthesize and store bile juice secreted by gall bladder which breaks down fats into fat globules. Pancreas: It secretes pancreatic juice which contains protein-digesting and starchdigesting enzymes.
(c) The organ which performs the following functions in humans are as follows:
(i) Absorption of digested food – Small intestine.
(ii) Absorption of water – Large intestine.

Question. (a) Draw a sectional view of the human heart and label on it – Aorta, Right ventricle and Pulmonary veins.
(b) State the functions of the following components of transport system:
(i) Blood (ii) Lymph
Answer : (a) 

""CBSE-Class-10-Science-Life-Processes-10
(b) The functions of blood and lymph are as follows:
(i) Blood
• Oxygen is transported by the blood to the tissues of the body for the breakdown of digested food.
• Carbon dioxide is transported to the lungs by the blood plasma.
• The digested and absorbed nutrients are transported by blood to the tissues. Nitrogenous wastes are transported to the kidneys.
• It regulates the body temperature and maintains the pH of the body tissues.
• It transports various hormones from one region to another and bring about the coordination.
• It maintains water balance to constant level.
• The lymphocytes produce antibodies against the invading antigens and protect from diseases.
• It helps in rapid healing of wounds by forming a clot at the site of injury.
(ii) Lymph
• It cleans the cellular environment.
• It returns proteins and tissue fluids to the blood (drainage)
• It provides a pathway for the absorption of fats and fat-soluble vitamins into the bloodstream.
• It defends the body against disease.

Question. (a) Draw a labelled diagram of the respiratory system of human beings with diaphragm at the end of expiration.
(b) List four conditions required for efficient gas exchange in an organism.
Answer : (a)

""CBSE-Class-10-Science-Life-Processes-9
(b) (i) A large surface area over which exchange can take place.
(ii) A concentration gradient without which nothing will diffuse.
(iii) A thin surface across which gases diffuse.
(iv) Warm conditions.

Question. (a) What is meant by breathing? What happens to the rate of breathing during vigorous exercise and why?
(b) Define translocation with respect to transport in plants. Why is it essential for plants? Where in plants are the following synthesised
(i) Sugar (iii) Hormone
Answer : (a) The process of taking in of oxygen from air in to the lungs and expulsion of carbon dioxide out of the lungs is called breathing. The rate of breathing during vigorous exercise increases by about 20 to 25 times per minute. It is because, during vigorous exercise the demand for oxygen increases. Breathing occurs involuntarily but its rate is controlled by the respiratory center of the brain.
(b) Translocation is the transport of food from the leaves to other parts of the plant and occurs in the part of the vascular tissue known as phloem.
It is essential for plants because every part of the plant needs food for obtaining energy for building its parts and maintaining its life.
(i) Sugar is synthesised in the leaves of the plant.
(ii) Hormones are synthesised at the tips of roots and stems of a plant.

Question. (a) Explain how does the exchange of gases occur in plants across the surface of stems, roots and leaves.
(b) How are water and minerals transported in plants?
Answer : (a) In plants, there are tiny pores called stomata on leaves and lenticels in stem which facilitate the exchange of gases. CO2 is taken in and O2 given out (during photosynthesis) and vice-versa during respiration.
(b) Mechanism of Transport of Water and Minerals in a Plant
• The vessels and tracheids of roots, stems and leaves in xylem tissue are interconnected to form a continuous system of water-conducting channels reaching all parts of the plant.
• The cells of the roots in contact with the soil actively take up ions which creates a difference in the ion concentration between the root and the soil.
• Thus, there is steady movement of water into root xylem from the soil, creating a column of water that is pushed upwards.
• Plant uses another strategy to move water in the xylem upwards to the highest points of the plant body.
• The water which is lost through the stomata is replaced by water from the xylem vessels in the leaf.
• Evaporation of water molecules from the cells of a leaf creates a suction which pulls water from the xylem cells of roots.
• This loss of water is transpiration which helps in the absorption and upward movement of water and minerals dissolved in it from roots to the leaves.
• Transpiration becomes the major driving force in movement of water in the xylem during the day when the stomata are open.
• This mechanism is also known as cohesion of water theory or transpiration pull.

Question. (a) Complete the glucose breakdown pathway in case of aerobic respiration by filling the blanks.

""CBSE-Class-10-Science-Life-Processes-5
(b) Name the molecule in the cell which stores the energy produced at the end of the pathway.
(c) Why do we get cramps during vigorous muscular activity?
Answer : (a) (1) Pyruvate (3 carbon molecules) (2) Energy (3) Presence of oxygen (4) In Mitochondria (5) Carbon dioxide (6) Water
(b) ATP
(c) Lactic acid accumulation, in the absence of oxygen (anaerobic respiration)cause cramps.

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