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A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. (a) What aspect of photosynthesis was being investigated ? (b) Is there any control in this experiment ? If so, state it. (c) Why was the plant kept in the dark before the experiment ? (d) Describe step by step, how the candidate proceeded to test leaf for the presence of starch. |
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Answer» A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. (a) What aspect of photosynthesis was being investigated ? (b) Is there any control in this experiment ? If so, state it. (c) Why was the plant kept in the dark before the experiment ? (d) Describe step by step, how the candidate proceeded to test leaf for the presence of starch. |
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