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What is the most suitable reason for a negative starch test in a green plant kept in darkness?

Answer and explanation

Correct answer: The plant did not make food without light

The governing concept is that green plants synthesize glucose by photosynthesis using light energy, carbon dioxide, and water; excess glucose is commonly stored as starch. When a plant is kept in darkness, the light-dependent stage cannot provide the required energy, so new food and starch formation become very limited or stop. Therefore option A is the best reason. Roots, oxygen uptake, and the absurd claim about blood do not explain the starch test.

Related tags

Starch TestPhotosynthesisLightFood FormationLife ProcessesWorld Of LivingScienceClass 10 Mcq

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