1. A
   green in colour
2. B
   brown in colour
3. C
   colourless
4. D
   blue-black in colour

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1. A
   Chloroplasts in the guard cells
2. B
   Cell walls of the cells
3. C
   Cell membranes of the cells
4. D
   Nuclei in the guard cells

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1. A
   I, III, IV
2. B
   only II
3. C
   I, II, III, IV
4. D
   only IV

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1. A
   Only A and B portions remained colourless and the rest of the leaf turned blue-black
2. B
   Only B and C portions turned blue-black
3. C
   A, B and C portions remained colourless and the rest of the leaf turned blue-black
4. D
   Whole leaf turned blue-black

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1. A
   II
2. B
   III
3. C
   I
4. D
   IV

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1. A
   did not draw nuclei in guard cells and other cells
2. B
   did not label the stoma in its correct position
3. C
   should have drawn nuclei and chloroplasts in guard cells and nuclei in all epidermal cells
4. D
   forgot to draw nuclei in guard cells and also to label the diagram

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1. A
   IV
2. B
   III
3. C
   II
4. D
   I

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

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1. A
   III
2. B
   II
3. C
   IV
4. D
   I

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1. A
   Sunlight is essential for photosynthesis
2. B
   Sunlight is not essential for chlorophyll
3. C
   Sunlight is not essential for photosynthesis
4. D
   Sunlight is essential for chlorophyll

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1. A
   IV
2. B
   II
3. C
   III
4. D
   I

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1. A
   IV
2. B
   II
3. C
   III
4. D
   I

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1. A
   Water
2. B
   Lime water
3. C
   Hydrochloric acid
4. D
   Potassium hydroxide

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1. A
   absorb carbon dioxide so as to create a partial vacuum
2. B
   react with water to generate oxygen
3. C
   remove impurities present in the air in the flask
4. D
   create a dry atmosphere for wet germinating seeds

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1. A
   B
2. B
   C
3. C
   D
4. D
   A

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1. A
   I
2. B
   III
3. C
   IV
4. D
   II

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1. A
   no substance is kept in the flask to absorb the gas given out by the seeds
2. B
   germinating seeds have not been kept under water in the flask
3. C
   water is kept in the beaker instead of limewater
4. D
   the cork on the flask is made of rubber

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1. A
   take up CO₂ from the atmosphere
2. B
   take up O₂ from the water
3. C
   release CO₂ into the air in the flask
4. D
   release O₂ into the air

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1. A
   A
2. B
   C
3. C
   D
4. D
   B

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1. A
   D
2. B
   C
3. C
   A
4. D
   B

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1. A
   A
2. B
   B
3. C
   C
4. D
   D

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1. A
   Translocation: helps in transporting materials from one cell to another
2. B
   Excretion: helps in excreting out waste water from the plant
3. C
   Evaporation: maintains water contents in leaf cells
4. D
   Transpiration: creates a suction force which pulls water inside the plant

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1. A
   Both A and B
2. B
   C only
3. C
   B only
4. D
   A only

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1. A
   A, B and C
2. B
   B and C
3. C
   A and C
4. D
   A and B

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1. A
   Sodium bicarbonate
2. B
   Sodium carbonate
3. C
   Potassium sulphate
4. D
   Potassium hydroxide

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