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When asked to set up an experiment to show that ‘light is necessary for photosynthesis’, a student ran to the school garden and set up the experiment by using a plant growing in the school garden.

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When asked to set up an experiment to show that ‘light is necessary for photosynthesis’, a student ran to the school garden and set up the experiment by using a plant growing in the school garden. The experiment failed. His classmates made the following suggestions to get success in the experiment.

Student A: Safranin should be used instead of iodine

Student B: The leaf should not be boiled in alcohol to remove chlorophyll before testing for starch

Student C: Transparent paper should be used instead of black paper strip.

Student D: The leaf should be destarched before starting the experiment

The correct suggestion is given by

(1) student A

(2) student B

(3) student C

(4) student D

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Correct answer: (4) student D

Explanation:

The correct suggestion was given by student D. The leaf should be destarched before performing the experiment. The leafs need to be destarched so that we can check during the experiment that starch synthesis occurs or not in the region covered with black strip.

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