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Why can the stem and root respond differently in phototropism?

Answer and explanation

Correct answer: Because their growth and sensitivity to the stimulus differ

The governing concept is that different plant organs can have different sensitivity and growth responses to the same stimulus. A shoot commonly shows positive phototropism and bends toward light, whereas a root commonly shows negative phototropism and grows away from light; gravity also influences the root strongly. Therefore option A is correct. The other options wrongly attribute the difference to brains, blood, or the origin of light.

Related tags

PhototropismRootStemControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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