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Start of synthesis of chlorophyll in a plant seedling is stimulated by

1. Gibberellins
2. Indole acetic acid
3. kinin
4. Light

Correct answer: Light

Solution

Light stimulates chlorophyll synthesis in seedlings by promoting de-etiolation and activating the pathways needed for chloroplast development. In darkness, seedlings remain etiolated and chlorophyll production is suppressed.

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