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Why are phototropism, hydrotropism, and geotropism placed in the same category?

Answer and explanation

Correct answer: Because all are direction-based growth responses

The governing concept is tropism, a directional growth response of a plant part to an external stimulus. Phototropism is growth in response to light, hydrotropism to water, and geotropism or gravitropism to gravity. Since the direction of stimulus influences the direction of growth in each case, option A is correct. They are not human reflexes, do not depend on blood circulation, and are not produced by muscles.

Related tags

TropismPhototropismHydrotropismGeotropismControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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