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CBSE Class 10 Exam 2024 : Science

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1 I. LIFE ON EARTH I CHARACTERISTICS OF THE LIVING Multiple choice questions: Tick (3) the correct choice. 1. Which one is not a unicellular organism? (a) Bacteria (b) Mushroom (c) Yeast (d) Amoeba Ans. (b) 2. A multicellular organism has (a) many cells (b) no cells (c) only one cell (d) both (a) and (b) Ans. (a) 3. The process of food manufacture by the green plants is called (a) respiration (b) growth (c) photosynthesis (d) excretion Ans. (c) 4. Respiration is a process during which (a) carbon dioxide is taken in (b) oxygen is taken in (c) Both oxygen and carbon dioxide are taken in Ans. (b) 5. The process of removal of waste materials from the body is called (a) respiration (b) excretion (c) photosynthesis (d) nutrition Ans. (b) 6. The activities that organisms carry out to maintain life are called (a) habits (b) response to stimuli (c) life processes (d) habitats Ans. (c) 7. Cells are present in (a) all living organisms (b) non-living things (c) both living and non-living things (d) all insects Ans. (a) 8. Green plants which make their own food are called (a) heterotrophs (b) autotrophs (c) saprophytes (d) aquatic plants Ans. (b) Z B L A A N L IO U AT D N E ER T IN Biology Class VI 1 Question Bank 9. The process of oxidation of food to release carbon dioxide, water and energy is called (a) breathing (b) respiration (c) reproduction (d) growth Ans. (b) 10. Respiration takes place in (a) rats (b) amoeba (c) big plants (d) all living organisms Ans. (d) 11. During respiration carbon dioxide is excreted through the (a) lungs (b) rectum (c) kidneys (d) heart Ans. (a) 12. Sense organs help an organism to (a) grow (b) respond to stimuli (c) respire (d) move Ans. (b) 13. Reproduction is the characteristic feature of (a) plants (b) animals (c) both plants and animals (d) non-living things Ans. (c) 14. The process by which organisms obtain the food they need is known as (a) growth (b) nutrition (c) photosynthesis (d) respiration Ans. (b) 15. The excretory product of respiration is (a) oxygen (b) energy (c) carbon monoxide (d) carbon dioxide Ans. (d) 16. Animals do not carry out the following process: (a) Excretion (b) Growth (c) Respiration (d) Photosynthesis Ans. (d) 17. The life process which allows an organism to continue its species is (a) growth (b) excretion (c) reproduction (d) respiration Ans. (c) Z B L A A L ION U AT D N E ER T IN Biology Class VI 2 2 Question Bank II. Fill in the blanks. 1. The branch of science dealing with the study of living beings is called .................. . 2. Basic unit of life is called .................. . 3. An organism made up of a single cell is called .................. . 4. All living things are made up of .................. . 5. All living things breathe in ............. and breathe out ............ . 6. An animal which cannot move is .................. . 7. Removal of metabolic wastes from the body is known as .................. . 8. The green colour of plants is due to the presence of .............. . 9. .................. grow throughout their lives. 10. The process by which organisms obtain food is known as .................. . 11. Organisms which cannot make their own food are called .................. . 12. .................. is needed for oxidation of food in cells. 13. On oxidation, food produces ........... , ........... and ............. . 14. .................. is a process of taking in oxygen and giving out carbon dioxide. 15. Excess water and salt is excreted through .................. in the form of sweat. 16. Green plants manufacture their own food by the process of .................. . 17. Gums and resins are .................. products of plants. 18. .................. things do not have sensitivity. 19. .................. (animal) has the longest lifespan. 20. .................. is the green pigment found in plants. Z B L A A N L IO U AT D N E ER T IN Biology Class VI 3 Question Bank Ans. 1. Biology 2. Cell 3. Unicellular organism 4. Cells 5. Oxygen, Carbon dioxide 6. Sea-anemone 7. Excretion 8. Chlorophyll 9. Plants 10. Nutrition 11. Heterotrophs 12. Oxygen 13. Carbon dioxide, Water, Energy 14. Breathing 15. Skin 16. Photosynthesis 17. Metabolic 18. Non-living 19. Tortoise 20. Chlorophyll. III. Match the terms with their meanings. Terms 1. nutrition 2. excretion 3. respiration 4. 5. 6. 7. 8. Meanings (a) any change in environment (b) producing more of their own kind (c) burning of food to release energy and CO2 (d) using food for growth and repair (e) removing wastes from the body (f) increase in size (g) activities that maintain life (h) taking in O2 and giving out CO2 Z B L A A L ION U AT D N E ER T IN stimulus reproduction life processes external respiration growth Ans. 1. (d) 7. (g) 2. (e) 8. (f) 3. (c) 4. (a) 5. (b) 6. (g) IV. Write true or false in front of the statements given below: 1. Animal cells possess cell walls. 2. Growth in plants is unlimited. 3. Cells can be seen with the naked eye. 4. Plants do not have any specific sense organs. 5. Animals reproduce by laying eggs or by giving birth to babies. 6. The growth in non-living things is internal. 7. All plants show partial movement except some free floating aquatic plants that show locomotion. 8. Reproduction is the characteristic feature of animals only. Ans. 1. False 2. True 3. False 4. True 5. True 6. False 7. True 8. False Biology Class VI 4 4 Question Bank V. Complete the following table and on the basis of your observations, and conclude whether the given living thing is an animal or a plant. Sl. No. Living thing Characteristics observed Conclusion Nutrition Growth Movement Cell wall (plant/ (autotrophic/ (limited/ (yes/no) (present/ animal) heterotrophic unlimited) absent) (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) Frog Grass Mushroom Earthworm Housefly Algae Cow Fish Heterotrophic Autotrophic Heterotrophic Heterotrophic Heterotrophic Autotrophic Heterotrophic Heterotrophic Limited Unlimited Unlimited Limited Limited Unlimited Limited Limited yes no no yes yes no yes yes Absent Present Present Absent Absent Present Absent Absent Z B L A A N L IO U AT D N E ER T IN Animal Plant Plant Animal Animal Plant Animal Animal VI. Sort out the list into the groups in the table. excretion respiration photosynthesis eating other living things movement from place to growth towards light place growth throughout life growth stops when adult size is reached Only animals Only plants Both animals and plants Movement from Photosynthesis Excretion plant to place Eating other living things Growth throughout life Respiration Growth stops when Growth towards adult size is reached light VII. Answer the following questions. 1. Name the instrument used to study micro-organisms. Ans. Microscope. 2. Name three micro-organisms. Biology Class VI 5 Question Bank Ans. Name of three micro-organism are as follows: Fungi Penicillium Algae Chlamydomonas Protozoan Amoeba 3. How are plants different from animals? Ans. Differences between plants and animals (1) (2) (3) (4) (5) 4. Ans. 5. Ans. Plants Plants have a green pigment called chlorophyll. Due to presence of chlorophyll, plants are autorophic in their mode of nutrition. Plants cannot no move from place to place they have only partial movement. Plants respond to external stimuli but have no sense organ. Plant cells generally have a large vacuole. Animals (1) Animals lack chlorophyll. Z B (2) Animals are heterotrophic in their mode of nutrition, i.e. take in prepared food. L A A L ION U AT D N E ER T IN (3) Animals move from one place to another place freely. (4) Animals have specific sense organ that help respond to external stimuli. (5) Vacuoles are generally absent; If present, they will be very small. Mention two features in which plant cells differ from animals cells. Plant cells are different from animal cells in the following ways: (i) Plant cells have a rigid cell wall while animal cells lack cell wall. (ii) Plant cells have a green pigment called chlorophyll while animal cells lack chlorophyll. Name an organism having characteristics of both plants and animals. Euglena posseses characteristics of both plants and animals. It contains green pigment chlorophyll (like plant) and lacks a cell Biology Class VI 6 6 Question Bank wall (like animal). It can move from one place to another. 6. Mention the features in which living things differ from the nonliving things (4 points). Ans. Differences between living and non-living things: Living things Non-living things (1) Living things are made of a (1) Non-living things have no microscopic unit called cell. cellular structure. (2) Living things can respire. (2) Non-living things can not respire. (3) Living things can reproduce (3) Non-living things cannot to gives its own kinds. reproduce. (4) Living things respose to (4) Non-living cannot response stimule. to stimule. Z B L A A N L IO U AT D N E ER T IN 7. Define the following terms: (i) Stimulus (ii) Reproduction (iii) Locomotion. Ans. (i) Stimulus: A stimulus is a detectable change in the internal or external environment. A response is an action which occurs as answer to a particular stimulus. For instance, cold weather, hot objects, sunlight and gravity are stimuli as a result of which respective responses like wearing of woollen clothes, withdrawal of hand, bending of plants towards light and downward growth of roots. (ii) Reproduction: Reproduction is the process by which living beings give birth to a new young ones. For example, a hen lays eggs which hatch into chicks and finally producing hens. A tree bears fruits which possess seeds. The seed develops into a young seedling and in due course of time, into a tree. (iii) Locomotion: Movement of animals from one place to another place, is called locomotion. Most of the animals show locomotion. Plants are fixed in the soil so they are unable to carry out locomotion, but show partial movement. Biology Class VI 7 Question Bank 8. Why do the leaves of the Mimosa plant droop down when touched? Ans. Mimosa is well known for its rapid plant movement. The leaves close up under various stimuli such as touching. The stimulus is also be transmitted to neighbouring leaves. The movement is caused by a rapid loss of pressure in strategically situated cells. 9. What is the difference between respiration and breathing? Ans. Difference between breathing and respiration: Breathing is the physical act that animals perform to take in oxygen-rich air and expulse oxygen-deficient air. Respiration is the chemical process by which cells breakdown energy-rich molecules to get energy to perform cellular functions. 10. How is a rose plant different from a butterfly? Give reasons to support your answer. Ans. We have following differences between a rose plant and a butterfly. Rose Plants Butterfly (1) Rose plant is a green woody (1) Butterfly is an animal that plant that can make its own cannot make its own food in the presence of food; so it feeds on sunlight. nectar. (2) Rose plant is fixed in one (2) Butterfly can fly from one place. place to another. (3) Rose plant has unlimited (3) Butterfly has limited growth. growth. (4) Rose plant has no specific (4) Butterfly has specific sense sense organ. organs. Z B L A A L ION U AT D N E ER T IN VIII. Choose the odd one out. 1. Organ system, Photosynthesis, Receptors. Ans. Photosynthesis. 2. Glycogen, Respiratory System, Chlorophyll. Ans. Chlorophyll. Biology Class VI 8 8 Question Bank 3. Unlimited growth, Autotrophic, Free locomotion. Ans. Free locomotion. IX. Differentiate between the following: (a) Growth and Movement. Ans. Growth Movement (1) Growth refers to an increase (1) Movement means a change in some quantity over time. of position that does not This quantity may be height, entail a change of location. width etc. Z B L A A N L IO U AT D N E ER T IN (b) Autotroph and Heterotroph. Ans. Autotroph (1) Green plants can prepare their own food by the process of photosynthesis, so they are called autotrophs. (auto-self; trophfood). Heterotroph (1) Animals cannot prepare their own food so they are depend on plants or other animals. So they are called heterotrophs (heteroother; troph-food) (c) Life cycle and Lifespan. Ans. Life-cycle (1) A lifecycle is the sequence of stages in a living organism i.e. birth, growth, reproduction and death. Life-span (1) The period during which an organism completes its life-cycle is called its life-span. (2) In case of animals, life-cycle (2) Life-span varies from starts with a single-celled organism to organism. For structure called zygote and example: bacteria has lifein plants it begins through span of 20 minutes and seeds or spores. tortoise has of 150 years. Biology Class VI 9 Question Bank X. Answer the following questions: 1. Which of the following are living objects? Milk, honey, orange, hen s egg, curd. Ans. Orange, hen s egg. 2. A motor car moves, takes in oxygen and gives out carbon dioxide, consumes fuel but is not a living creature. In what ways does it not qualify as a living organism? Ans. A motor car can move, takes in oxygen and gives out carbon dioxide by consuming fuel but it is not a living creature because these all activities happen when this car is drove by a man. And other activities like reproduction growth etc. are also not shown by a car. 3. Name a plant which is not green, and one animal which does not move about freely. Ans. Mushroom, Sea-anemone. 4. Name one microscopic plant and one microscopic animal. Ans. Microscopic plant-alga (Chlamydomonas), Miscroscopic animal-protozoan (Amoeba) 5. Why do all living organisms need food? Ans. To perform different activities during the day, we require energy and this energy comes from the oxidation of food. So, food is required by all living things. Food also helps in the growth and maintenance of the body. 6. Which part of leaf takes part in exchange of gases? Ans. Tiny pores called stomata present on the surface of leaves takes part in exchange of gases. Z B L A A L ION U AT D N E ER T IN **** Biology Class VI 10 10 Question Bank

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