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An experiment using two leaves, a variegated leaf or a leaf that was covered with black paper and one that was exposed to light on testing these leaves for starch shows that photosynthesis occurs only in __A_ part of leaf in the presence of _B___.

A B
1. non-green sunlight
2. green green light only
3. non-green blue light only
4. green sunlight

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answer is D.

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Detailed Solution

Photosynthesis occurs in the green parts of leaves and in the presence of sunlight.

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