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Roots can grow towards water and in the direction of gravity. What feature of plants does this show?

Answer and explanation

Correct answer: They show growth response to directional stimuli

The governing concept is tropism, a directional growth response to an external stimulus. Water provides hydrotropic stimulation and gravity provides geotropic stimulation. Roots grow toward water and generally downward in response to gravity, showing that plant growth can be coordinated without a nervous system. Photosynthesis, nerves and blood circulation do not explain this directional growth. Therefore option A correctly identifies the feature.

Related tags

Control CoordinationTropismHydrotropismGeotropismControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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