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EXERCISE 4.1, Multiple Choice Questions (1 Mark), , Choose the correct answer from the given options., 1. The process by which organism takes nutrients is called, , (a) Nutrition (6) Respiration (c) Photosynthesis (d) Circulation, 2. Which of the following is not a characteristic of an organism., (a) They can grow (b) They respond to changs in environment, , (c) They release energy during respiration, (d) They do not need food, and water, 3. Which of the following is a life process?, (a) Respiration (6) Transportation (c) Excretion (d) All of these, 4. Pseudopodia are:, (a) small hair-like structures present on unicellular organisms., (b) false feet developed in some unicellular organisms., (c) long, tube-like structures coming out of the mouth., (d) suckers which are attached to the walls of the intestines. [CBSE 2020], , . Assertion-Reason Type Questions (1 Mark), , For question numbers 1 and 2, two statements are given-one labeled as Assertion (A) and, the other labeled Reason (R). Select the correct answer to these questions from the codes, (a), (6), (c) and (d) as given ahead:
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(a) Both ‘A’ and ‘R’ are true and ‘RP’ is correct explanation of the Assertion., (6) Both ‘A’ and ‘PR’ are true but ‘R’ is not correct explanation of the Assertion., (c) ‘A’ is true but ‘R’ is false., (d) ‘A’ is false but ‘R’ is true., 1. Assertion: Nutrition, respiration, transportation, excretion, growth are essential, processes for our life., Reason: We cannot survive without these processes., 2. Assertion: Our body can exchange energy and matter with the surrounding., , Reason: Our body is a closed system.
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EXERCISE 4.2, I. Multiple Choice Questions, , Choose the correct answer from the given options., 1, The gas which is released during photosynthesis, , (1 Mark), , (a) CO, (b) O2 (c) Np (d) SO,, 2. Desert plant take up carbon dioxide during, (a) Day (b) Night, (c) Either day or night (d) Never take CO,, , 3. Protein is digested in which of the following organ., , (a) mouth (b) stomach and small intestine, (c) large intestine (d) stomach only
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4. Which of the following statements about the autotrophs is incorrect?, (a) They synthesise carbohydrate from carbon dioxide and water in the presence of, sunlight and chlorophyll, (b) They store carbohydrates in the form of starch, (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight, (d) They constitute the first trophic level in food chains, 5. What is the mode of nutrition in fungi?, (a) Autotrophic (6) Heterotrophic, (c) Saprophytic (d) Parasitic, 6. 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., Cork cut so leaf, , can pass through, , , , , Leaf removed and, , Exposed, tested for starch, , to light ‘aA, , S hours Substance to absorb, , carbon dioxide, What are the colours of Q and R, when the leaf is tested for starch, using iodine solution?, , , , , , , , , , , , , , , , , , , , , , Q R, (a) | Blue/black Brown, (6) | Brown Brown, (c) | Blue/black Blue/black, (d) | Brown Blue/black, Il. Assertion-Reason Type Questions (1 Mark), , For question numbers 1 to 5, two statements are given-one labeled as Assertion (A) and, the other labeled Reason (R). Select the correct answer to these questions from the codes, (a), (6), (c) and (d) as given below:, (a) Both ‘A’ and ‘R’ are true and ‘PR’ is correct explanation of the Assertion., (6) Both ‘A’ and ‘R’ are true but ‘RP’ is not correct explanation of the Assertion., (c) ‘A’ is true but ‘R’ is false., (d) ‘A’ is false but ‘R’ is true., 1. Assertion: Multicellular organisms need special organs for exchange of gases between, their body and environment., Reason: They need more O,, therefore need special organs like lungs., 2. Assertion: Carbon and energy requirements of autotrophs are full filled by, photosynthesis., Reason: Autotrophs do not prepare their own food., 3. Assertion: Raw materials needed for photosynthesis are carbon dioxide, water and, minerals., Reason: Nutrients provide energy to an organism., 4. Assertion: Digestion breaks large complex molecules to simple smaller molecules which, can be easily absorbed., Reason: Digestion is necessary for the absorption of all molecules.
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5. Assertion: The release of energy in aerobic process is much more than in anaerobic, process., Reason: Each glucose molecule produces 2 molecules of ATP and 38 molecules of, ATP in aerobic and anaerobic respiration, respectively.
