1. A
   Heterotrophs do not synthesise their own food
2. B
   Heterotrophs synthesise their own food
3. C
   Heterotrophs are capable of converting carbon dioxide and water into carbohydrates
4. D
   Heterotrophs utilise solar energy for photosynthesis

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1. A
   Blood transports only oxygen and not carbon dioxide.
2. B
   Human heart has five chambers.
3. C
   Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.
4. D
   Valves ensure that the blood does not flow backwards.

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1. A
   (ii) and (iv)
2. B
   (i) and (ii)
3. C
   (i) only
4. D
   (ii) only

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1. A
   It is a growth related movement.
2. B
   It does not depend on the direction of stimulus received.
3. C
   It is due to stimulus of touch and temperature.
4. D
   It is independent of any stimulus.

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1. A
   The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.
2. B
   The small intestine is the site of complete digestion of food.
3. C
   The small intestine receives secretions from liver and pancreas.
4. D
   The length of the small intestine in animals differs as it depends on the type of food they eat.

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1. A
   Energy is essential for life processes
2. B
   Movement of molecules does not take place among cells
3. C
   Organisms grow with time
4. D
   Organisms must repair and maintain their structure

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1. A
   (ii) and (iv)
2. B
   (ii) and (iii)
3. C
   (i) and (iv)
4. D
   (i) and (iii)

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1. A
   Glucose →(cytoplasm) Pyruvate →(mitochondria) Lactic acid
2. B
   Glucose →(cytoplasm) Pyruvate →(mitochondria) Ethanol + Carbon dioxide
3. C
   Glucose →(cytoplasm) Pyruvate →(cytoplasm) Lactic acid
4. D
   Glucose →(cytoplasm) Pyruvate →(cytoplasm) Ethanol + Carbon dioxide

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1. A
   It is stored in the leaves of plants during daytime.
2. B
   Plants do not respire during daytime.
3. C
   It is not produced during daytime.
4. D
   Major amount of carbon dioxide produced is used up for photosynthesis during daytime.

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1. A
   (i) and (ii)
2. B
   (iii) and (iv)
3. C
   (ii) and (iv)
4. D
   (ii) and (iii)

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1. A
   translocation and movement of soluble products of photosynthesis in phloem.
2. B
   transpiration and temperature regulation.
3. C
   translocation and absorption of water and minerals from soil by roots.
4. D
   transpiration and photosynthesis.

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1. A
   Estrogen
2. B
   GnRH
3. C
   Insulin
4. D
   Adrenaline

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1. A
   ADP
2. B
   Pyruvic acid
3. C
   AMP
4. D
   ATP

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1. A
   RBC
2. B
   Plasma
3. C
   Platelets
4. D
   WBC

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1. A
   Jejunum
2. B
   Rectum
3. C
   Duodenum
4. D
   Ileum

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1. A
   Ureter
2. B
   Urethra
3. C
   Urinary bladder
4. D
   Nephron

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1. A
   Transpiration
2. B
   Circulation
3. C
   Photosynthesis
4. D
   Osmoregulation

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1. A
   mitochondria
2. B
   chloroplast
3. C
   cytoplasm
4. D
   nucleus

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1. A
   Oxygen of the flask.
2. B
   Moisture of the flask.
3. C
   Air of the flask.
4. D
   Carbon dioxide of the flask released by the seeds.

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1. A
   Pisces only
2. B
   Amphibians only
3. C
   Pisces and amphibians
4. D
   Amphibians and reptiles only

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1. A
   iodine
2. B
   colchicine
3. C
   safranin
4. D
   acetocarmine

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1. A
   Paramecium, Amoeba, Cuscuta
2. B
   Mushroom, Green plants, Amoeba
3. C
   Cuscuta, Lice, Tapeworm
4. D
   Yeast, Mushroom, Bread mould

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1. A
   alveoli of lungs
2. B
   throat and larynx
3. C
   alveoli and throat
4. D
   trachea and larynx

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1. A
   Oxidation of carbon to carbon dioxide
2. B
   Absorption of light energy by chlorophyll
3. C
   Conversion of light energy to chemical energy
4. D
   Reduction of carbon dioxide to carbohydrates

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1. A
   KOH solution
2. B
   Alcohol
3. C
   Iodine solution
4. D
   Lime water

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