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Biology MCQs

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What is the term for the growth of plant roots downward in response to gravity?

  • A Phototropism
  • B Geotropism
  • C Hydrotropism
  • D Thigmotropism
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Correct Answer: Option B — Geotropism
Explanation: Geotropism is the directional growth response of plant roots toward the pull of gravity ensuring they penetrate the soil to anchor the plant and absorb water and nutrients.
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