You may have carried out the experiment to look for starch formation in two leaves – a variegated leaf or a leaf that was partially covered with black paper, and exposed to light. On testing these leaves for the presence of starch it was clear that photosynthesis occurred only in the green parts of the leaves in the presence of light.
Assertion (A): Presence of light is essential for starch formation in leaves. Reason (R): Light triggers protein synthesis in guard cells.
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