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4. Explain that sunlight is essential for photosynthesis.

4. Explain that sunlight is essential for photosynthesis.

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 26625 Points
10 months ago
Ans: Take a potted plant having green leaves. Place it in a dark room for a day or two so that all the starch present in leaves is used by the plant. Now cover a portion of leaf with black paper and keep the plant in the sun for a day. Pluck the leaf, remove the black paper and test it for the starch. We see that only that part of the leaf becomes blue-black which was open to sun. The covered part does not become blue-black. This shows that no starch is formed because it gets no sunlight.

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