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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 Class 10. This test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks
Chapter 6 Life Processes Class 10 Science Assignment
Question. Following is true for heterotrophs
(a) Heterotrophs survival depends directly or indirectly on autotrophs
(b) Heterotrophic organisms include animals and fungi
(c) In heterotrophs, complex substances have to be broken down into simpler ones
(d) All of the above
Answer : D
Question. Carbon and energy requirements of the autotrophic organism are fulfilled by
(a) enzymes
(b) photosynthesis
(c) bacteria
(d) none of the above
Answer : B
Question. _____ are utilised for providing energy to the plant
(a) carbohydrates
(b) vitamins
(c) proteins
(d) fats
Answer : A
Question. The following event(s) occur during photosynthesis
(a) Absorption of light energy by chlorophyll
(b) Conversion of light energy to chemical energy
(c) Reduction of carbon dioxide to carbohydrates
(d) All of the above
Answer : D
Question. Chlorophyll is contained in
(a) leaf
(b) stem
(c) roots
(d) both (a) and (b)
Answer : D
Question. Tiny pores present on the surface of the leaves are known as
(a) stomata
(b) chloroplast
(c) organelles
(d) none of the above
Answer : A
Question. Following used in photosynthesis is taken up from the soil by the roots in terrestrial plants
(a) water
(b) nitrogen
(c) magnesium
(d) all of the above
Answer : A
Question. Example(s) of some organism(s) break-down the food material outside the body and then absorb it
(a) fungi
(b) yeast
(c) mushrooms
(d) all of the above
Answer : D
Question. Example(s) of some organisms which derive nutrition from plants or animals without killing them
(a) cuscuta
(b) ticks
(c) leeches
(d) all of the above
Answer : D
Question. _____ takes in food using temporary finger-like extensions of the cell surface.
(a) Amoeba
(b) green plants
(c) tape worms
(d) none of the above
Answer : A
Question. The _____ is basically a long tube extending from the mouth to the anus.
(a) Alimentary canal
(b) oesophagus
(c) diaphragm
(d) bile duct
Answer : A
Question. Gastric glands release ____, a protein digesting enzyme called pepsin, and mucus.
(a) Sulphuric acid
(b) hydrochloric acid
(c) nitric acid
(d) none of the above
Answer : B
Question. Following has shorter small intestine.
(a) Herbivores
(b) carnivores
(c) both (a) and
(b) (d)none of the above
Answer : B
Question. The enzymes present in secrete intestinal juice finally convert the
(a) Proteins to amino acids
(b) Complex carbohydrates into glucose
(c) Fats into fatty acids and glycerol
(d) All of the above
Answer : D
Question. The inner lining of the small intestine has numerous finger-like projections called
(a) Vitli
(b) villi
(c) vipli
(d) none of the above
Answer : B
Question. The processes which together perform the maintenance job are
(a) Life proceedings
(b) life processes
(c) life maintenance
(d) None of the above
Answer : B
Question. The process of acquiring Oxygen from outside the body and to use it in the process of breakdown of food sources for cellular needs is called
(a) Respiration
(b) Digestion
(c) Transportation
(d) Excretion
Answer : A
Question. The waste products removed from the body and discarded by a process is called
(a) Respiration
(b) Digestion
(c) Transportation
(d) Excretion
Answer : D
Question. Following are autotrophs
(a) Green plants
(b) Some bacteria
(c) Enzymes
(d) Both A and B
Answer : D
Question. Glucose is a _____ carbon molecule.
(a) Four
(b) five
(c) six
(d) seven
Answer : C
Question. Pyruvate is a _____ carbon molecule
(a) three
(b) four
(c) five
(d) six
Answer : C
Question. The process of breaking molecules in the absence of oxygen is called
(a) Respiration
(b) aerobic respiration
(c) anaerobic respiration
(d) none of the above
Answer : C
Question. A person breathing normally at rest takes in and expells approximately half a litre of air during each respiratory cycle. It is called :-
(a) Expiratory reserve volume
(b) Tidal volume
(c) Inspiratory reserve volume
(d) Vital capacity
Answer : B
Question. Red blood corpuscles in mammals are biconcave in shape. This shape is advantageous because :-
(a) the cells can lie one over the other easily
(b) there is less surface area than in biconvex shaped corpuscles of the same volume
(c) It has larger surface area than a round structrue of the same volume
(d) it helps in transportation of RBC in the blood stream
Answer : C
Question. Emphysema is a condition resulting from
(a) cigarette smoking
(b) liquor consumption
(c) drug addiction
(d) none of the above
Answer : A
Question. Excess amino acids can be oxidised to release chemical energy only after deamination. By the term deamination we under stand :-
(a) removal of carboxyl group (COOH)
(b) removal of nitrogen
(c) removal of amino group (NH2)
(d) removal of carbon dioxide
Answer : C
Question. The exchange of gases (O2 and CO2) in a mammal takes place in :-
(a) Trachea
(b) Bronchi
(c) Bronchioles
(d) Alveoli
Answer : D
Question. Clotting of blood is achieved with the help of the following :-
(a) vitamin K, fibrinogen and calcium ions
(b) prothrombin, fibrinogen and thromboplastin
(c) vitamin K, fibrinogen, prothrombin and calcium ions
(d) vitamin B, fibrinogen, thrombin and potassium ions
Answer : C
Question. Urea, a nitrogenous waste, requires a large amount of water. Therefore it is the main excretory product in :-
(a) protozoans, amphibians and reptiles
(b) elasmobranchii, adult amphibians
(c) reptiles, birds and mammals
(d) insects, birds ad fishes
Answer : B
Question. Pacemaker of the heart is :-
(a) Bundle of His
(b) Purkinje fibres
(c) A.V. Node
(d) S.A. Node
Answer : D
Question. The white matter in a bird's dropping is :-
(a) calcium carbonate
(b) calcium sulphate
(c) uric acid
(d) urea
Answer : C
Question. Maximum food absorption takes place in :-
(a) Ileum
(b) Colon
(c) Rectum
(d) Stomach
Answer : A
Question. The ability of leucocytes to invade and destroy bacteria is known as :-
(a) phagocytosis
(b) amoebiasis
(c) active transport
(d) homeostasis
Answer : A
Question. Which one of following enzymes is present in saliva ?
(a) Pepsin
(b) Ptyalin
(c) Trypsin
(d) Chymotrypsin
Answer : B
Question. CO2 and O2 balance in atmosphere is due to
(a) photorespiration
(b) photosynthesis
(c) respiration
(d) leaf anatomy
Answer : B
Question. A sudden increase in the number of white blood cells in the blood is a sign of :-
(a) deficiency disease
(b) better health
(c) bacterial disease, infection
(d) mental tension
Answer : C
Question. Which of the following parts of a kidney contains the lowest concentration of urea ?
(a) Loop of Henle
(b) Branches of venal vein
(c) Bowman's capsule
(d) Glomerulus
Answer : B
Question. Mountain sickness result due to :-
(a) Anaemic hypoxia
(b) Arterial hypoxia
(c) Lack of sufficient Hb
(d) Lack of sufficient RBCs
Answer : B
Question. The percentage of Rh+ people in a population is about :-
(a) 60
(b) 70
(c) 85
(d) 95
Answer : C
Question. Uriniferous tubules of a kidney are concerened with the formation of :-
(a) glucose
(b) amino acids
(c) hormones
(d) urine
Answer : D
Question. Bulk of the tooth in mammals is made up of
(a) dentine
(b) enamel
(c) pulp cavity
(d) root
Answer : A
Question. The hardest part of a tooth is the
(a) dentine
(b) enamel
(c) pulp
(d) dental tubules
Answer : B
Question. Lactic acid is a ____ carbon molecule
(a) Three
(b) four
(c) five
(d) six
Answer : C
Question. Breaking down of glucose in the presence of oxygen produces
(a) Carbon dioxide
(b) water
(c) energy
(d) all of the above
Answer : D
Question. The energy released during the process of respiration is used to make an _____ molecule.
(a) ATP
(b) ADP
(c) AVP
(d) ATC
Answer : A
Question. ATP can be used in the cells for the
(a) Contraction of muscles
(b) protein synthesis
(c) conduction of nervous impulses
(d) all of the above
Answer : D
Question. Plasma transports _____ in dissolved form
(a) Food
(b) carbon dioxide
(c) nitrogenous wastes
(d) all of the above
Answer : D
Question. Following has to be transported by the blood
(a) Oxygen
(b) carbon dioxide
(c) both (a) and
(b) (d)none of the above
Answer : C
Question. Following is (are) true about heart
(a) Oxygen-rich blood from the lungs comes to the left atrium
(b) De-oxygenated blood comes from the body to the upper chamber on the right, the right atrium, as it relaxes.
(c) Valves ensure that blood does not flow backwards when the atria or ventricles contract
(d) All of the above
Answer : D
Question. Amphibians or many reptiles have _____ - chambered hearts
(a) One
(b) two
(c) three
(d) four
Answer : D
Question. The normal systolic pressure is about ____mm of Hg and diastolic pressure is ____ mm of Hg.
(a) 100,60
(b) 120,80
(c) 140,100
(d) 160,120
Answer : B
Question. Blood pressure is measured with an instrument called
(a) Manometer
(b) sphygmomanometer
(c) hydrometer
(d) anemometer
Answer : B
Question. ____ are the vessels which carryblood away from the heart to various organs of the body
(a) Veins
(b) spines
(c) arteries
(d) none of the above
Answer : C
Question. Following is true for tissue fluid or lymph
(a) It is similar to the plasma of blood
(b) It is colorless
(c) It contains less protein
(d) All of the above
Answer : D
Question. Which part of nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?
(a) Tubule
(b) Glomerulus
(c) Bowman’s capsule
(d) Ureter
Answer : A
Question. What are the products obtained by anaerobic respiration in microorganisms?
(a) Lactic acid + Energy
(b) Carbon dioxide + Water + Energy
(c) Ethanol + Carbon dioxide + Energy
(d) Pyruvate
Answer : C
Question. Water absorption in plants can be increased by keeping the potted plants:
(a) in the shade
(b) in dim light
(c) under the fan
(d) covered with a polythene bag
Answer : C
Question. Following is true about lungs
(a) Within the lungs, the passage divides into smaller and smaller tubes
(b) The lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed
(c) Both (a) and (b)
(d) None of the above
Answer : C
Question. In human beings, the respiratory pigment is
(a) Hemoglobin
(b) insulin
(c) enzyme
(d) none of the above
Answer : A
Question. Haemoglobin is present in
(a) Red blood corpuscles
(b) White blood corpuscles
(c) Plasma
(d) None of the above
Answer : A
Question. Following is true for plants
(a) Plants have low energy needs
(b) The xylem moves water and minerals obtained from the soil
(c) Phloem transports products of photosynthesis from the leaves to other parts of the plant
(d) All of the above
Answer : D
Question. The loss of water in the form of vapour from the aerial parts of the plant is known as
(a) Transpiration
(b) respiration
(c) transportation
(d) none of the above
Answer : A
Question. The transport of soluble products of photosynthesis is called
(a) Transpiration
(b) respiration
(c) transportation
(d) translocation
Answer : D
Question. The excretory system of human beings includes
(a) A pair of kidneys
(b) A pair of ureters
(c) A urinary bladder and a urethra
(d) All of the above
Answer : D
Question. Following is true
(a) CO2 is removed from the blood in the lungs
(b) Nitrogenous waste such as urea or uric acid are removed from blood in the kidneys
(c) The purpose of making urine is to filter out waste products from the blood
(d) All of the above
Answer : B
Question. The kidney is associated with the cup-shaped end of a coiled tube called
(a) Glomerulus
(b) Bowman’s capsule
(c) collecting duct
(d) none of the above
Answer : B
Question. Each kidney has large numbers of filtration units called
(a) Nephrons
(b) glomerulus
(c) renal vein
(d) none of the above
Answer : A
Question. Which of the following is an example of anabolic process
(a) Digestion
(b) Respiration
(c) photosynthesis
(d) Response to stimuli
Answer : C
Question. Digestion is extracellular in
(a) Animals
(b) Human
(c) Amoeba
(d) All the above
Answer : D
Question. ln order for the blood to flow from right ventricle to left ventricle in mammalian heart, it must flow through
(a). Right ventricle pulmonary arteries, lungs, pulmonary veins, left atrium
(b). Right ventricle, pulmonary veins, lungs, pulmonary arteries, left atrium
(c). Right ventricle, right atrium, lungs, pulmonary veins, left atrium.
(d). Right ventricle, systemic aorta, pulmonary veins, left atrium
Answer : A
Question. The end product of fat digestion is
(a) Fatty acid
(b)Glycerol
(c) Aminoacids
(d) Both A and B
Answer : D
Question. Conversion of large fat droplets into smaller droplets are
(A0 Anabolism
(b) Neutralisation
(c) Assimilation
(d) Emulsification
Answer : D
Question. Alternate contraction and relaxation of the alimentary canal is called
(a) Peristalsis
(b) Ingestion
(c) Deglutition
(d) None of these
Answer : A
Very Short Answer type Questions
Quetion. On what factors does the direction of diffusion of carbon dioxide and oxygen depend in plants?
Answer: The direction of diffusion of carbon dioxide and oxygen in plants depends on the environmental conditions and the requirements of the plant. Carbon dioxide elimination is the maor exchange activity at night, whereas oxygen release is the main activity at day time.
Quetion. Which equipment is used to facilitate breathing during serious breathing problems?
Answer: Ventilator
Quetion. Name the pigment present in plants, which can absorb solar energy.
Answer: Chlorophyll.
Quetion. Where does digestion of starch begin in human body?
Answer: Mouth
Quetion. What do you mean by double circulation of blood?
Answer: Blood passes through the heart twice for each cycle of the body.
Quetion. Give one example each of saprophytic and parasitic nutrition.
Answer: Parasitic Nutrition – Plasmodium (Protozoa) Saprophytic Nutrition – fungi
Quetion. Name the largest artery of body.
Answer: Aorta
Quetion. What is the role of rings of cartilage present in the throat?
Answer: The rings of cartilage present in the throat ensure that the air passage does not collapse.
Quetion. What is the role of blood plasma?
Answer: Blood plasma transports food, carbon dioxide and nitrogenous wastes in dissolved form.
Quetion. What are outside raw materials used by an organism?
Answer: Any organism uses organic molecules (i.e oxygen for respiration) as raw material. Auto- trophs use carbon dioxide, minerals, water and Heteroptrophs use food.
Quetion. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
Answer: As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells.
Quetion. (a) Photosynthesis converts energy X into energy Y. What are X and Y?
(b) Write the stages involved in the process of photosynthesis.
Answer: (a) X is solar energy, Y is chemical energy
(b) Absorption of light energy. conversion of light energy to chemical energy and splitting of water molecule. reduction of CO2 to carbohydrates.
Quetion. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Answer: Adaptation of terrestrial organism over aquatic organism for efficient uptake of oxygen from air –
(i) Increased respiratory surface area.
(ii) Very fine and delicate surface for easy exchange of oxygen and carbon – dioxide.
(iii) Placement of respiratory surface within the body for protection
(iv) Mechanism for moving the air in and out of respiratory surface where the oxygen is absorbed.
Quetion. Why is it necessary to separate oxygenated & deoxygenated blood in mammals & birds?
Answer: Separation of oxygenated and deoxygenated blood allows good supply of oxygen to the body. This system is useful in animals that have high energy requirement. Mammals and birds constantly need oxygen to get energy to maintain constant body temperature.
Quetion. 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.
Quetion. Ventricles have thicker muscular walls than atria. Give reason.
Answer: Ventricles have to pump blood forcefully so as to reach even distant capillaries, right ventricle into lungs and left ventricle to all the remaining body parts, while atria are to pump blood into adjacent ventricles.
Quetion. Why is the rate of breathing much faster in aquatic organisms than those of terrestrial organisms?
Answer: The aquatic organisms obtain oxygen dissolved in water. As compared to air, the availability of oxygen in water is fairly low. Hence, the aquatic organisms have to breathe faster as compared to the terrestrial organisms.
Quetion. Name two digestive glands associated with digestive system in humans. Name their secretions.
Answer: 1. Salivary glands — saliva.
2. Pancreas — pancreatic juice.
Quetion. Major amount of water is selectively reabsorbed by the tubular part of nephron in humans. What are the factors on which the amount of water reabsorbed depends?
Answer: 1. Amount of excess water present.
2. Amount of dissolved wastes to be excreted.
Quetion. What is the function of trachea? Why do the walls not collapse even when there is less air in it?
Answer: Trachea is a tube that connects pharynx with lungs for carrying air to and from lungs.
Trachea is lined by ciliated mucus secreting pseudostratified epithelium for trapping dust particles and microbes.
Trachea does not collapse in reduced air pressure due to support of C-shaped cartilaginous rings.
Quetion. Name the respiratory organs of (i) fish (ii) mosquito (iii) earthworm.
Answer: Fish – gills
Mosquito – Trachea (air tubes)
Earthworm – moist skin
Quetion. Which mechanism plays an important role in transportation of water in plants
(a) During daytime
(b) At night?
Answer: (a) Transpiration pull
(b) Water deficit of daytime and afterwards root pressure.
Short Answer type Questions
Quetion. What are the differences between the transport of materials in xylem and phloem?
Answer: Xylem:
(1) Xylem tissue helps in the transport of water and minerals.
(2) Water is transported upwards from roots to all other plant parts.
(3) Transport in Xylem occurs with the help of simple physical forces such as transpiration 3 pull.
Phloem:
(1) Phloem tissue helps in the transport of food.
(2) Food is transported in both upward and downward directions.
(3) Transport (of food) in Phloem requires energy in the form of ATP.
Quetion. Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light. Which one will live longer? Give reasons.
Answer: The plant kept in continuous light will live longer because plants undergo photosynthesis in the presence of light. Due to this plants produce oxygen which it then uses for the process of respiration. This process will not take place in the plant that is kept in dark. As a result, it will not survive for a long time.
60. Write two different ways in which glucose is oxidized to provide energy in human body. Write the products formed in each case.
Ans. The first step is breakdown of the -carbon molecule glucose takes place in the cytoplasm of cells of all organism. In this step we obtain a 3 carbon molecule compound called pyruvate
Quetion. In each of the following situations what happens to the rate of photosynthesis?
(A) Cloudy days
(B) No rainfall in the area
(C) Good manuring in the area
(D) Stomata get blocked due to dust
Answer: (A) Cloudy days will cause the rate of photosynthesis to decrease due to the low availability of sunlight.
(B) No rainfall in the area will cause the rate of photosynthesis to decrease due to the low availability of water.
(C) Good manuring in the area will cause the rate of photosynthesis to increase due to the improved availability of minerals necessary for plant growth and development.
(D) The blockage of stomata due to dust will cause the rate of photosynthesis to decrease. This is because the CO2 required for photosynthesis enters the leaves through the stomata. If the stomata get blocked due to dust, less CO2, or no CO2 would enter the leaves or leaf and the rate of photosynthesis will drop.
Quetion. Name the energy currency in living organisms. When and where is it produced?
Answer: ATP (Adenosine Triphosphate) is the energy currency in the living organisms. It is the energy currency for most cellular processes. The energy released during the process of respiration is used to make an ATP molecule from ADP and inorganic phosphate. ADP + P Energy → ADPP = ATP (P: Phosphate) Endothermic processes in the cell then use this
ATP to drive the reactions. When the terminal phosphate linkage in ATP is broken using water, energy equivalent to 30.1 km / mol is released. ATP can be used in the cells for the contraction of muscles, protein synthesis, conduction of nervous impulses and many other activities.
Quetion. Plants have low energy needs as compared to animals. Explain.
Answer: Plants are stationary and exhibit movement in terms of growth and development only, i.e., at cellular level. In addition, plants have dead schlerenchyma cells in many of their organs which in turn produce mechanical strength but are not involved in cellular process. Animals move from one place to another and need more energy compared to plants.
Question. List any 3 functions of the major circulatory fluid of our body.
Answer: (i) Transport of O2 (from lungs to different parts of the body) and CO2 (from tissues/ organs, back to lungs).
(ii) Transport of digested food (glucose, amino acids, etc.) from Small Intestine to various parts of the body.
(iii) Transport hormones from their site of production (endocrine organs) to the site of action (target organs or tissues in different parts of the body).
(iv) Carry nitrogenous wastes of metabolism from various tissues/ organs, to kidneys, to be removed as urine.
(v) Harmful substances or toxins are transported to the liver for detoxification.
(vi) Antibodies produced by the leucocytes provide immunity to the body.
(vii) Help maintain body temperature (thermoregulation) by the process of sweating (perspiration)
Question. What are the functions of saliva? (Any 3 points)
Answer: (i) Saliva moistens the food, making it easy to be chewed.
(ii) The taste buds are able to sense the taste of food only as the finer particles of food mix into the saliva and get into the taste pores of the taste buds.
(iii) Moistening of food by saliva helps swallow the food as well.
(iv) The enzyme salivary amylase in saliva starts digestion of starch in the buccal cavity.
(v) Saliva also kills some of the microbes entering with food.
Question. List the three steps in photosynthesis.
Answer: (i) Absorption of sun’s energy by Chlorophyll
(ii) Conversion of light energy into chemical energy; and, splitting of water into hydrogen and oxygen using the light energy.
(iii) Reduction of carbon dioxide into carbohydrates like glucose using the chemical energy.
Question. What is the significance of Small Intestine in our body? (Any 3 points)
Answer: Significance of SI:
(i) The secretions of liver and pancreas are brought to the duodenum of SI. The hepatic duct from liver and the pancreatic duct from pancreas join forming hepatopancreatic duct bring the secretions of both glands to duodenum where these help in digestion of food.
(ii) There are some intestinal glands also in the first part of SI, which also secrete enzymes. The process of digestion of food is completed here.
(iii) The fine finger like structures called “Intestinal Villi” increase the surface area for absorption of digestive end products.
(iv) The length of the SI ensures that food remains in it for a long time as it travels through SI, thereby making it possible for maximum amount of nutrients to be absorbed.
HOTS QUESTIONS (SOLVED / UNSOLVED)
Q1. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Ans. The mammals and birds are warm-blooded animals which have high energy needs because they constantly require energy to maintain their body temperature. It is necessary to separate oxygenated blood and deoxygenated blood in mammals and birds because such a separation allows a highly efficient supply of oxygen to the body cells which is required for producing a lot of energy needed by them.
Q2. How is small intestine designed to absorb digested food?
Ans. The inner surface of small intestine has millions of tiny, finger like projections called Villi. The presence of villi gives the inner walls of the small intestine a very large surface area. The large inner surface area of small intestine helps in the rapid absorption of the digested food.
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CBSE Class 10 Science Chapter 6 Life Processes Assignment
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