CBSE Class 10 Biology Life Processes Worksheet Set A

Read and download free pdf of CBSE Class 10 Biology Life Processes Worksheet Set A. Download printable Science Class 10 Worksheets in pdf format, CBSE Class 10 Science Chapter 6 Life Processes Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 10 Assignments and practice them daily to get better marks in tests and exams for Class 10. Free chapter wise worksheets with answers have been designed by Class 10 teachers as per latest examination pattern

Chapter 6 Life Processes Science Worksheet for Class 10

Class 10 Science students should refer to the following printable worksheet in Pdf in Class 10. This test paper with questions and solutions for Class 10 Science will be very useful for tests and exams and help you to score better marks

Class 10 Science Chapter 6 Life Processes Worksheet Pdf

Question. Which of the following does not respire through lungs? 
a. Duck
b. Frog
c. Whale
d. Tadpole

Answer : D

Question. Match the following with correct response. 
(1) Saliva                      (A) sucrose
(2) Gastric juice             (B) Pepsin
(3) Pancreatic juice        (C) Amylase
(4) Succuss entricus       (D) Trypsin
a. 1-A, 2-C, 3-B, 4-D
b. 1-C, 2-B, 3-D, 4-A
c. 1-B, 2-D, 3-A, 4-C
d. 1-D, 2-A, 3-C, 4-B

Answer : B
 
 
Question. Which is the vestigial part of human alimentary canal?
a. epiglottis
b. pineal gland
c. thymus gland
d. Vermiform appendix

Answer :  D
 
 
Question. In the experiment to prove that light is necessary for photosynthesis, which one of the following is not required ?
a. Water
b. KOH
c. Iodine
d. Alcohol 

Answer : B 
 
 
Question. The figure which does not illustrate any of the steps of the experiment to show that light is necessary for photosynthesis is 
 Stru-
a. I
b. I, II, and IV
c. I and III
d. III

Answer : D
 

TRUE/FALSE :

Question. Respiration is the only source of energy for all organisms.

Answer : False

Question. External respiration may be called breathing.

Answer : True

Question. Grass-eating animals need a longer small intestine to allow the cellulose to be digested.

Answer : True

Question. Translocation is the transportation of the products of photosynthesis.

Answer : True

Question. Generally gravitational water is utilized by the plants.

Answer : False

Question. Arteries are the widest blood vessels.

Answer : True

Question. Fishes respire through skin.

Answer : False

Question. Trypsin digests proteins into amino acids.

Answer : False

Question. Blood is not a tissue because it is a fluid.

Answer : False

Question. The systems in an organism work independently.

Answer : False

Question. Some organs are used in more than one system.

Answer : True

Question. In humans, the alveoli are the functioning units of external respiration.

Answer : True

Question. Only animals have tissues.

Answer : False

Question. The loss of water by a plant is called transpiration.

Answer : True

Question. Stretching of inner wall of guard cells, open the stomata.

Answer : True

Question. The exchange of nutrients and waste products between the blood and cells occurs within the arteries.

Answer : False

Question. Stomata are tiny pores present on the surface of leaves.

Answer : True

Question. Carbon-di-oxide cannot be transported with haemoglobin.

Answer : False

Question. Birds and mammals have tow-chambered heart.

Answer : False

Question. Leucocytes play an important role in blood coagulation.

Answer : False

Question. Fermentation is a form of aerobic respiration.

Answer : False

Question. Only the multicellular organisms require transporting mechanisms.

Answer : False

Question. The liquid portion of the blood is called plasma.

Answer : True

Question. In a general sense, digestion is simply hydrolysis of complex polymers to monomers.

Answer : True

Question. Bowman’s capsule is found in heart.

Answer : False

Question. Deficiency of folic acid causes scurvy.

Answer : False

Question. Essential amino acids cannot be synthesized in human body.

Answer : True

Question. A complete digestive tract consists of an oral and an anal opening.

Answer : True

Question. Humans have an open circulatory system.

Answer : False

Question. The lacteals contain absorbed carbohydrates.

Answer : False

Question. In humans, protein digestion is completed in the mouth.

Answer : False

Question. In photosynthesis, carbon-di-oxide is given out by diffusion process.

Answer : False

Question. Teeth are the only part of the digestive system that physically breaks down food.

Answer : False

Question. Living organisms must maintain a constant internal environment.

Answer : True

Question. Veins are thick walled.

Answer : False

Question. Circulatory system also performs the function of homeostasis.

Answer : True

MATCHING QUESTIONS :

DIRECTION : Each question contains statements given in two columns which have to be matched. Statements (A, B, C, D) in column I have to be matched with statements (p, q, r, s) in column II.

Question. 
CBSE Class 10 Science Life Processes Worksheet_24

Answer : A-s, B-r, C-p, D-q

Question. 
CBSE Class 10 Science Life Processes Worksheet_20

Answer : A-s, B-r, C-q, D-p

Question. 
CBSE Class 10 Science Life Processes Worksheet_22

Answer : A-q, B-r, C-p, D-s

Question. 
CBSE Class 10 Science Life Processes Worksheet_25

Answer : A-(q), B-(p), C-(s), D-(r)

Question.
CBSE Class 10 Science Life Processes Worksheet_21

Answer : A-p, B-q, C-r, D-s

Question. 
CBSE Class 10 Science Life Processes Worksheet_19

Answer : A-r, B-s, C-p, D-q

Question. 
CBSE Class 10 Science Life Processes Worksheet_23

Answer : A-s, B-r, C-p, D-q


Very Short Answer :

Question :  What do you mean by living things and non- living things? 
Answer :  Those things which are alive are called living things and the things which are not alive or cannot move by themselves called non- living.
 
Question : Name the exchange of gases between the blood and the air at the respiratory surface.
Answer : External respiration

Question :  What are cells? 
Answer :  All the living things plants and animals are made up of the tiny living units called cells.

Question :  What is the most important sign of life in an organism? 
Answer :  Movement is one of the most important signs of life in an organism. 
 
Question :  What are resins and gums? 
Answer : Resins and gums are storage wastes of plants. 
 
Question :  Write one function of valves in the walls of veins. 
Answer :  The valves in the walls of veins prevent the backflow of blood.
 
Question : Which of these blood vessel carry less nitrogenous waste - renal vein or the renal artery? 
Answer : Renal vein carries deoxygenated but purified blood (has less nitrogenous waste) away from the kidney.

Question :  Why glucose is the simplest food? 
Answer : Glucose is the simplest food because it is very easily absorbed by our body.

Question : How the leaves of the plant have green color?
Answer :  The green color of the plant leaves is due to the presence of the chlorophyll in them.
 

Short Answer :

Question : How many pairs of salivary glands are there in humans ? Where do they open? 
Answer :  There are three pairs of salivary glands in human beings. They open into the buccal cavity
 
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 is particularly advantageous in warm-blooded animals such as birds and mammals who constantly use energy to maintain their body temperature. 
 
Question :  A girdled tree dies if the girdle is wide and is not filled up. comment. 
Answer:  Girdling removes bark containing phloem from the trunk region. Food manufactured foliage does not reach the roots which requires the same as they are always growing.
In the absence of food supply, roots starve and stop absorbing water. The foliage wilts and the plants dies. 

Question. What would be the consequences of a deficiency of haemoglobin in our bodies?
Answer: If haemoglobin content is reduced in blood, its oxygen carrying capacity decreases. So the person shows symptoms of deficient oxygen such as breathlessness and lack of energy. The person looks pale and loses weight. This condition is called anaemia.

Question. (i) Which organ secretes a hormone when the blood sugar rises? Name a digestive enzyme released by this organ.
(ii) Why pancreas helps in digestion and also regulates blood sugar? 
Answer: (i) Pancreas secretes insulin (hormone) when the blood sugar rises. Pancreas secretes pancreatic juice which contains digestive enzymes.
(ii) Pancreas secretes enzymes like pancreatic amylase which breaks down starch, trypsin which breaks down proteins and lipase breaks down emulsified fats.
Pancreas also secretes a hormone called insulin which controls the metabolism of sugar. Therefore it lowers the blood sugar level. So pancreas is both an exocrine and an endocrine gland.

Question. Give reasons for the following:
(a) Arteries are thick walled.
(b) Blood goes only once through the heart in fishes.
(c) Plants have low energy needs. 
Answer: (a) Arteries have thick walls because these vessels carry blood from the heart to all the parts of the body and blood emerges from the heart under high pressure.
(b) A fish has a two chambered heart and has gills to oxygenate blood. In a fish, the heart pumps deoxygenated blood to gills where oxygenation of blood takes place. The oxygenated blood from the gills is supplied to the body parts of the fish where oxygen is utilised and carbon dioxide enters into it, making it deoxygenated. This deoxygenated blood returns to the heart to be pumped into gills again. Thus blood passes through the heart of fish only once in one complete cycle.
(c) Plants are fixed at a place and do not show any locomotion. Plants are less active. Their cells do not need to be supplied with materials so quickly. Therefore plants have low energy needs and respire at a slow rate.

Question. (a) State the purpose of formation of urine. 
(b) What will happen if there is no tubular reabsorption in the nephrons of kidney?
Answer: (a) • Urea is produced as a waste by decomposition of unused proteins in the liver. Our body must get rid of these waste materials because their accumulation in the body is poisonous and harmful for us.
• Kidneys are the organs which remove the poisonous substance urea, other waste salts and excess water from the blood and excrete them in the form of a yellowish liquid called urine.
(b) During filtration, the substances like glucose, amino acids, salts, water and urea etc. present in the blood pass into Bowman’s capsule and then enter the tubule of nephron. When the filtrate containing useful substances as well as the waste substances passes through the tubule, the useful substances like glucose, amino acids, most salts and most water etc. are reabsorbed into blood through blood capillaries surrounding the tubule. Only the waste substances like urea, some unwanted salts and excess water remain behind in the tubule. Therefore, reabsorption in the nephrons of kidneys is important.

Question. (i) Name two waste products which are stored in old xylem in plants.
(ii) Name the process by which plants get rid of excess water. Name the pores through which this process takes place. 
Answer: (i) Resin and gums are the two wastes which are stored in old xylem in plants.
(ii) • Transpiration is the process by which plants get rid of excess water.
• Stomatal pores are the pores through which transpiration takes place.

Question. Describe the process of anaerobic respiration.
Answer: The respiration which takes place in the absence of oxygen is called anaerobic respiration.
During this respiration glucose is broken down into ethyl alcohol and CO2 with the release of very small amount of energy. In anaerobic respiration one molecule of oxygen produces only 2 ATP molecules of energy. This type of respiration occurs in microscopic organisms like yeast, bacteria, etc.
In human beings, the energy is obtained by aerobic respiration but sometimes anaerobic respiration occurs in the muscles during vigorous exercise when oxygen gets consumed at a faster rate than its supply by the blood. During the anaerobic respiration in the muscles the glucose is converted into lactic acid with the release of 2 ATP molecules of energy.
Anaerobic respiration in human beings:

Question. Explain how water and minerals are transported in plants? 
Answer: Most plants secure their water and minerals from their roots. Minerals travel dissolved in water. Water and minerals are transported through xylem cells from the soil to the leaves. The xylem cells of roots, stem and leaves are interconnected to form a conducting channel. 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 form one cell to the other due to osmosis. The continuous loss of water takes place due to transpiration.

Question. Describe the structure and functioning of nephron. 
Answer: Structure of nephron. Nephron is the basic filtration unit in the kidney. It consists of a tubule which is connected with a collecting duct at one end and a cup shaped structure at the other end, called Bowman’s capsule. Every Bowman’s capsule contains a cluster of capillaries called glomerulus within the cup-shaped structure. The blood enters into glomerulus through afferent arteriole of renal artery and leaves it through efferent arteriole.
Basic functions of Nephrons:
(i) Filtration. Filtration of the blood takes place in Bowman’s capsule in the capillaries of the glomerulus.
Then this filtrate passes into the tubular part of the nephron. The filtrate contains glucose, amino acids, urea and uric acid and a large amount of water.
(ii) Reabsorption. The filtrate flows along the tubule and useful substances such as glucose, amino acids, salts and some water are re-absorbed into the blood by the capillaries surrounding the nephron tubule.
(iii) Urine. The filtrate which remains after the re-absorption is called the urine, which is collected from nephron by the collecting duct to carry it to the urinary bladder and then to the urethra.

Question. (a) What happens to the heart when muscles work harder? 
(b) Which body system is directly affected when a person has heart disease?
(c) Which cells increase in number during infection?
Answer: (a) When muscles work harder, the heart beats faster because the muscles need more energy than the normal requirement. The faster beating of heart pumps blood more rapidly to the muscles which supplies more oxygen to the muscle cells for rapid respiration to produce more energy.
(b) Human circulatory system is directly affected when a person has heart disease.
(c) White blood cells (WBCs) increase in number during infection.

Question. The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air from nostrils to the lungs in human beings. 
Answer: The animals which live in water (aquatic animals) use the oxygen dissolved in water to carry out respiration. Since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore, the rate of breathing in aquatic animals is much faster than in terrestrial animals. A faster rate of breathing provides more oxygen to aquatic animals. Pathway of air in human beings:
Nostrils → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Lungs

Question. Explain the nutrition process in Amoeba.
Answer: Amoeba takes in the food particles with the help of its finger like projections called pseudopodia. Inside its cell a food vacuole is formed around the food particle. Inside the food vacuole, complex substances are broken down into simpler ones which are then diffused into the cell cytoplasm. The remaining undigested material is sent to the surface of the cell and thrown out. This process of nutrition in Amoeba is called Endocytosis.

Question. Bile juice does not contain any enzyme but bile salts are important for digestion and absorption of fats. State reason. 
Answer: Bile is a digestive juice secreted by the liver. Although it does not contain any digestive enzymes, it plays an important role in the digestion of fats.
Bile is alkaline and contains salts which help to emulsify or break the fats (or lipids) present in the food.
Thus, bile performs two functions:
(i) Makes the acidic food coming from the stomach alkaline so that pancreatic enzymes can act on it.
(ii) Bile salts break the fats present in the food into small globules making it easy for the enzymes to act and digest them.

Question. (a) State reason for the following: 
(i) Rings of cartilage are present in the trachea.
(ii) Plants look green in colour.
(b) Write other names of the following:
(i) Alveolar sac (ii) Voice box
Answer: (a) (i) The air coming from the nostrils during breathing passes through the trachea. The trachea does not collapse even when there is no air in it because it is supported by rings of soft cartilages.
(ii) Plants look green in colour because of the presence of a green pigment called chlorophyll in their chloroplasts.
(b) (i) Alveolar sac → Alveoli
(ii) Voice box → Larynx

 
Question : Give the chemical equation of photosynthesis. 
Answer :  A chemical equation of photosynthesis is
Stru-2

 

Long Answer :

Question : i. Draw the structure of a nephron and label the following parts on it.
a. Renal artery
b. Bowman's capsule
c. Glomerulus
d. Collecting duct
ii. Name four substances in the initial filtrate which are selectively reabsorbed as the filtrate floor along the tubule.
Answer :

Stru-1

 
ii. Glucose, amino acids, salts and adequate amount of water are reabsorbed initially after ultrafiltration.

 

 
Question : Describe the structure and functioning of nephrons. 
Answer : Structure of Nephron: Nephron is the structural and functional unit of kidney.
Stru
i. It consists of a long coiled tubule differentiated into proximal tubule, loop of Henle and distal tubule. The latter opens into the collecting tubule.
ii. At the proximal end of the nephron lies a double-walled cup-shaped structure called Bowman’s capsule.
iii. The Bowman’s capsule contains a bundle of blood capillaries which is called glomerulus. 
iv. In the glomerulus, the blood that comes in through afferent arteriole is drained out through efferent arteriole.
 
Functions of Nephron:
i. Filtration: Filtration of blood takes place in Bowman’s capsule from the capillaries of glomerulus. This takes place under high pressure. The filtrate passes into the tubular part of the nephron. This filtrate contains glucose, amino acids, urea, acid, salts and major amount of water.
ii. Selective Reabsorption: As the filtrate flows along the tubule, useful substances such as glucose, amino acids, salts and water are selectively reabsorbed into the blood by capillaries surrounding the nephron tubule. The amount of water reabsorbed depends on the need of the body and also on the amount of wastes to be excreted.
iii. Tubular secretion: Certain substances which are harmful and not needed by the body like ammonia, potassium, creatinine and hydrogen ions are secreted from the capillary blood into the lumen of distal tubule. This is called tubular secretion.

 

Chapter 06 Life Processes
CBSE Class 10 Biology Excretion Set A
CBSE Class 10 Biology Excretion Set B
CBSE Class 10 Biology Excretion Set C
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set A
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition In Animals Worksheet
CBSE Class 10 Biology Life Processes Nutrition In Plants Worksheet
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set A
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set C
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set D
CBSE Class 10 Biology Life Processes Reference Materials Worksheet
CBSE Class 10 Biology Life Processes Respiration In Animals Worksheet
CBSE Class 10 Biology Life Processes Respiration Worksheet Set A
CBSE Class 10 Biology Life Processes Respiration Worksheet Set B
CBSE Class 10 Biology Life Processes Respiration Worksheet Set C
CBSE Class 10 Biology Life Processes Respiration Worksheet Set D
CBSE Class 10 Biology Life Processes Transporation Worksheet Set A
CBSE Class 10 Biology Life Processes Transporation Worksheet Set B
CBSE Class 10 Biology Life Processes Transporation Worksheet Set C
CBSE Class 10 Biology Life Processes Transporation Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet
CBSE Class 10 Biology Life Processes Worksheet Set A
CBSE Class 10 Biology Life Processes Worksheet Set B
CBSE Class 10 Biology Life Processes Worksheet Set C
CBSE Class 10 Biology Life Processes Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet Set E
Chapter 09 Heredity and Evolution
CBSE Class 10 Biology Heredity And Evolution Set D
Chapter 13 Magnetic Effects of Electric Current
CBSE Class 10 Physics Magnetic Effects of Electric Current Worksheet Set E

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