Question

Write an activity to prove that sunlight is necessary to form starch in green plant

Answer 1

Answer:

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Answer 2

Answer:

• Take a plant with destarched leaves(leaves free from starch-by keeping it in dark for 24-48 hours).
• Cover one of its leaves with black paper on which a design is cut.
• Place this plant in the Sun.

• After a few hours,test the leaf which is covered by the black paper for the presence of starch by using the Iodine solution.

It will be observed that only the parts of the leaf, which could get light through the cut out design as well as those that were left uncovered by the paper ,turn Blue-Black , showing the presence of starch and the parts which were covered turn Brown.

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Explanation: