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A stem grows upward and a root grows downward. What will their responses to gravity be called in the same plant?

Answer and explanation

Correct answer: Stem negative and root positive geotropism

The governing rule is that positive geotropism means growth in the direction of gravity, whereas negative geotropism means growth opposite to gravity. Gravity acts downward. The root grows downward and therefore shows positive geotropism; the stem grows upward and therefore shows negative geotropism. Hence option B is correct. The other choices either reverse the signs or name responses to light or chemicals.

Related tags

Control CoordinationGeotropismPlant ResponsesControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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