CBSE Class 10 Science Life Processes Assignment Set C

Read and download free pdf of CBSE Class 10 Science Life Processes Assignment Set C. Get printable school Assignments for Class 10 Science. Standard 10 students should practise questions and answers given here for Chapter 6 Life Processes Science in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Science prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 10 Science Chapter 6 Life Processes

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

Chapter 6 Life Processes Class 10 Science Assignment

Question. Choose the correct statement(s) amongst the following.       
(a) For regulating different life processes energy is required.
(b) Living organisms grow with time.
(c) Living organisms need to repair and maintain their structures.
(d) Molecules within the cells do not exhibit movement.
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. Coagulation of blood in a cut or wound is brought about by:
(a) plasma
(b) platelets
(c) WBC
(d) RBC
Answer : B

Question. The opening and closing of the stomatal pore depends upon
(a) Oxygen
(b) Temperature
(c) water in the guard cells
(d) concentration of CO2
Answer : C

Question. Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?
(a) Ethanol + Carbon dioxide + Energy
(b) Lactic acid + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate
Answer : B

Question. The food in autotrophs is reserved in the form of       
(a) protein
(b) fatty acid
(c) glycogen
(d) starch
Answer : D

Question. Which of the following respiratory structures has cartilage rings to prevent it from collapsing?       
(a) Nasal cavity
(b) Pharynx
(c) Larynx
(d) Trachea
Answer : D

Question. Which of the following is the correct sequence representing human alimentary canal?    
(a) Mouth → oesophagus → stomach → small intestine → large intestine
(b) Mouth → small intestine → stomach → oesophagus → large intestine
(c) Mouth → stomach → oesophagus → small intestine → large intestine
(d) Mouth → stomach → oesophagus → large intestine → small intestine
Answer : A

Question. Pancreatic juice is carried by the pancreatic duct into              
(a) large intestine 
(b) liver
(c) duodenum
(d) stomach
Answer : C

Question. Which part of human cell is involved in conversion of pyruvic acid into lactic acid during deficiency of oxygen?       
(a) Golgi body
(b) Mitochondria
(c) Cytoplasm
(d) Lysosome
Answer : C

Question. Which of the following gases turns lime water milky when we blow air into it from mouth?       
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Carbon monoxide
Answer : B

Question. Which of the following processes is responsible for cramps in the muscles of sportsmen?       
(a) Nonconversion of glucose to pyruvate
(b) Conversion of pyruvate to lactic acid due to deficiency of oxygen
(c) Conversion of pyruvate to glucose in presence of oxygen
(d) Conversion of pyruvate to ethanol
Answer : B

Question : Loop of Henle’s is found in:
(b) Liver
(c) Nephron
(d) Neuron
Answer : C

Question :  Covering with black paper strips should be tested for presence of 
(a) O2 in leaf
(b) Starch in leaf
(c) Water in leaf
(d) CO2 in leaf
Answer : B
Explanation: The covered part of the leaf does not show presence of starch, while the uncovered part shows starch.

Question : --------------the key organ of, cardiovascular system which acts as a muscular pump.
(b) Heart
(c) Lungs
(d) Stomach
Answer : B

Question :  Which gland in the human body which secretes digestive enzymes as well as a hormone? 
(a) Ovary
(b) pancreas
(c) thyroid
(d) Testis
Answer : B
Explanation: Pancreas is both an endocrine and an exocrine gland, in that it functions to produce endocrinic hormones released into the circulatory system (such as insulin, and glucagon), to control glucose metabolism, and also to secrete digestive/exocrinic pancreatic juice (such as trypsin), which is secreted eventually via the pancreatic duct

Question : Which one of the following juices secreted in the human body does not contain any enzyme?
(a)Salivary juice
(b) Bile juice
(c)Gastric juice
(d) Pancreatic juice
Answer : B
Question : Select the incorrect pair
(a)Respiration-Oxidation of food to obtain energy
(b)Nutrition-Obtaining and utilizing nutrient
(c)Transportation-Responses to stimuli
(d)Excretion-Removal of waste byproducts
Answer : C 

Fill in the blanks.

Question. ...... is the muscular and tubular part of the alimentary canal.
Answer : Oesophagus

Question. The complete process of anaerobic respiration takes place in ...... .
Answer : cytoplasm

Question. ...... energy is used in splitting water molecules into hydrogen and oxygen.
Answer : Light

Question. During photosynthesis light energy is converted into ...... .
Answer : chemical energy

Question. Human lungs have ...... of air sacs for the exchange of gases.
Answer : millions

Write Yes/No.

Question. Is haemoglobin present in WBC?
Answer : No

Question. Are guard cells devoid of chloroplast?
Answer : No

Question. Is pyruvate formed in mitochondria?
Answer : No

Question. Is large intestine the site of complete digestion of proteins?
Answer : No 

Question. Does the breakdown of pyruvate using oxygen take place in mitochondria?
Answer : Yes



1. Human Digestive System


Question. Which of these correctly represent the labels B, C, D and E?
A. Pancreas, Oesophagus, Stomach, Liver
B. Oesophagus, Liver, Stomach, Pancreas
C. Stomach, Liver, Oesophagus, Pancreas
D. Oesophagus, Pancreas, Liver, Stomach
Answer : B

Question. Villi are present in
A. D
B. E
C. F
D. A
Answer : C

Question. The enzyme that is released by the part label A is
A. Trypsin
B. Amino acids
C. Amylase
D. Intestinal juices
Answer : C

Question. The movements that occur along part B to push the food forward.
A. Rotation
B. Peristalsis
C. Flexion
D. Protrusion
Answer : B

Question. In case of diarrhoea, which major process does not take place normally in region G?
A. Absorption of food
B. Absorption of water
C. Secretion of hormones
D. Removal of waste material
Answer : B


Assertion Reason Type Questions

Following questions consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
A. Both assertion and reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion: A plant closes its stomata when it does not need carbon dioxide for photosynthesis
Reason: Large amount of water can be lost as vapour through the stomata.
Answer : B

Question. Assertion: Mammals has double circulation.
Reason: Higher energy need due to endothermy (warm blooded).
Answer : A

Question. Assertion: The left atrium and left ventricle are completely separated from the right atrium and the right ventricle.
Reason: Oxygenated and deoxygenated blood never mix with each other inside the heart.
Answer : A

Question. Assertion: In a healthy adult, the initial filtrate in the kidneys is about 180 L daily, but the actual volume excreted is only a litre a day.
Reason: Most of the filtrate is lost from the body in the form of sweat.
Answer : C


Very Short Answer

Question. What role is played by stomata during photosynthesis?
Answer : CO2 enters the leaves and O2 is released into air through stomata.

Question. Where is bile stored?
Answer : Gall bladder

Question. Name the organism which converts pyruvate to ethanol.
Answer : Yeast

Question. Where does the second stage of aerobic respiration take place?
Answer : Mitochondria

Question. Which type of organ is vermiform appendix?
Answer : Vestigial

Question. From where does a plant obtain water for photosynthesis?
Answer : Water is absorbed from soil.

Question. What is similar among animals, fungi and some bacteria?
Answer : They cannot prepare their own food.

Question : Why is transpiration important for plants?
Answer : Transpiration is important because:
(1) it helps in absorption and upward movement of water and minerals from roots to leaves.
(2) it prevents the plant parts from heating up.

Question :  What is mode of nutrition in fungi? 
Answer : In fungi, there is saprotrophic mode of nutrition. In this case organisms obtain foodfrom dead and decaying organic matter.

Question :  How does water reach upto the leaves ? 
Answer : Water is taken up by the roots and reaches the leaves through the xylem vessels which are a part of the vascular bundle.

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 : In the experiment set up to show that “CO2 is given out during respiration”, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use. 
Answer : The substance taken in a small test tube in the conical flask is Potassium Hydroxide or KOH. The KOH solution absorbs the evolved carbon dioxide released by germinating seeds during respiration. The absorption of all the released CO2 gas by KOH solution creates a partial vacuum in the conical flask due to which level of water rises up in the tube.

Question : Define parasitic nutrition. Name an organism having parasitic mode of nutrition.
Answer : Parasitic Nutrition: The parasitic nutrition is that nutrition in which an organism derives its food from the body of another living organism without killing it. Organisms having parasitic mode of nutrition are Plasmodium and round-worms.

Question : In which form do plants store the carbohydrates which are not used immediately?
Answer : Plants store carbohydrates which are not used immediately in the form of starch.

Question : How is the opening and closing of stomatal pore regulated in plants?
Answer : The opening and closing of stomatal pores is a function of guard cells. When water flows into guard cells, they swell up causing the stomatal pore to open. When the guard cells shrink, the pore closes.

Question : If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer. 
Answer : If the plant shows evidence that it is releasing CO2 during the day and taking in oxygen, it does not mean that there is no photosynthesis taking place in the plant. Instead, it suggests that the plant is undergoing photosynthesis at a very low rate. In a normal scenario, the rate of respiration is higher during night while it is slower during the day. The CO2 produced during night time is utilized by the plant during the day to perform photosynthesis. 

Question :  Name the system responsible for transportation of materials in human body. 
Answer : 1) Blood vascular system
2) Lymphatic system

Question :  Mention the role of pancreatic enzyme. 
Answer : Pancreatic enzymes help break down fats, proteins and carbohydrates. A normally functioning pancreas secretes about 8 cups of pancreatic juice into the duodenum, daily. This fluid contains pancreatic enzymes to help with digestion and bicarbonate to neutralize stomach acid as it enters the small intestine. Pancreatic enzyme trypsin helps in digesting protein and the pancreatic amylase helps in the breakdown of starch.  

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 : Where does aerobic respiration occurs in a cell?
Answer : Aerobic respiration occurs in mitochondria of the cell.

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? 
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? 
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 : What is the role of acid in our stomach?
Answer : HCl of gastric juice disinfects the food and make the medium acidic for proper functioning of pepsin.

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. 


Short Answer

Question : Describe the process of urine formation in kidneys.
Answer : The purpose of making urine is to filter out waste products from the blood. The basic filtration unit in the kidneys, is a cluster of very thin-walled blood capillaries. Each capillary cluster in the kidney is associated with the cup-shaped end of a tube that collects the filtered urine. Each kidney has large numbers of these filtration units called nephrons. Nephrons are packed close together. Some substances in the initial filtrate, such as glucose, amino acids, salts and a maor amount of water, are selectively re-absorbed as the urine flows along the tube. The amount of water reabsorbed depends on how much excess water is in the body and on how much of dissolved waste is to be excrete(d) The urine forming in each kidney eventually enters a long tube, called the ureter, which connects the kidneys with the urinary bladder. Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge of passing it out through the urethr(a) As a result, we can usually control the urge to urinate.

Question : List four functions of the human heart. Why is double circulation necessary in the human body?
Answer : Functions of the human heart are listed below:
(1) The human heart is a muscular organ that pumps oxygenated blood throughout the body.
(2) The Left Atrium of the heart receives the oxygenated blood from the lungs.
(3) The Right Atrium of the heart receives the deoxygenated blood froam different parts of our body.
(4) The Right Ventricle of the heart sends the deoxygenated blood to the lungs for oxygenation. Double circulation is necessary as the separation of oxygenated and deoxygenated blood allows a more efficient supply of

Question : What is photosynthesis? Explain its mechanism.
Answer : Photosynthesis– A process in which green plants takes carbon dioxide and water and converts them into carbohydrates in the presence of sunlight and chlorophyll.

 Life Processes_9

(i)Absorption of light energy by chlorophyll.
(ii)Conversion of light energy to chemical energy.
(iii)Splitting of water molecules (H2O) into hydrogen and oxygen.
(iv)Reduction of carbon dioxide to carbohydrate.

 Life Processes_10


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.

Long Answer

Question : Answer the following:
(A) What would happen if all the green plants disappear from the earth?
(B) If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? justify your answer.
Answer :  (A) Green plants are the sources of energy for all organisms. If all green plants disappear from the earth, all the herbivore will die due to starvation and so will the carnivores.
Since autotrophs are the only organisms that can fix the atmospheric carbon dioxide into organic compounds, these organisms occupies first trophic level in food chain and serve as source of food and energy for all other organisms of higher trophic evels (heterotrophs/consumers). Hence, in absence of these plants, whole functioning of whole ecosystem will come to a halt due to lack of food and energy source for consumers (herbivores, carnivores and omnivores)
(B) Respiration is the process of oxidation of food substances that release carbon dioxide; it takes place throughout the day. Photosynthesis is the process of fixing the atmospheric carbon dioxide into organic compounds (carbohydrates) with release of oxygen gas as by product. Photosynthesis takes place during the day in presence of Sunlight only.
The CO2 released during respiration is absorbed by plants for photosynthesis during day causing net release of oxygen only. If a plant is releasing carbon dioxide and taking in oxygen during the day, it means that either rate of photosynthesis is too slow to counter balance the release of CO2 by respiration or photosynthesis is not taking place at all.

Question : Describe the process of urine formation in kidneys. 
Answer : Urine is formed in the nephron of kidneys. Nephron is the structural and functional unit of the kidney. Blood at high pressure travels into these tubules by the tuft of blood capillaries called glomerulus contained in Bowman's capsule.
The following steps are involved in the process:
i. Filtration: Blood enters the glomerulus through the afferent arterioles It passes under high pressure that results in the filtration of bloo(d) Water and small molecules are forced out of glomerular capillary walls and Bowman’s capsule.
Large molecules remain in the blood of the glomerulus.
ii. Selective reabsorption: Some molecules are selectively reabsorbed into the bloo(d) The glomerular filtrate flows through the proximal convoluted tubule, the U-shaped Henle’s loop and distal convoluted tubule. The useful substances such as glucose, amino acids and salts which require energy are reabsorbed by a process called selective reabsorption. Hence, the filtrate now contains urea, some salts and water. Reabsorption of solutes increases the water concentration of the filtrate.
Water is then reabsorbed into the blood by osmosis.
iii. Tubular secretion: Some nitrogenous waste products like creatinine and some other substances like K+ are removed from the blood by DCT (Distal Convoluted Tubule) and are passed to bloo(d) The urine thus formed is collected in the urinary bladder.
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