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Root growing towards water and a pollen tube growing towards an ovule are examples of what, respectively?

Answer and explanation

Correct answer: Hydrotropism and chemotropism

The governing concept is that tropisms are named according to the stimulus guiding growth. A root growing toward water shows hydrotropism, because water or moisture is the relevant stimulus. A pollen tube grows toward the ovule in response to chemical attractants released by the female reproductive structures, showing chemotropism. Thus option A is correct; the other choices assign unrelated stimuli to one or both examples.

Related tags

HydrotropismChemotropismPlant ResponseControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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