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Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination5 Marks
Question
Plants show tropism in response to stimuli’. Comment.
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Answer

Plants respond to different stimuli usually by showing growth repsonses. this phenomena of responding is usually named as tropism. it could either be positive or negative.
  • Phototropism: the growth response of a plant in response to light direction. Different parts of a plant exhibit different reactions to light. Stems exhibit positive phototropism while most roots exhibit negative phototropism.
  • Chemotropism: the growth response of a plant to a particular chemical. Roots grow toward useful minerals in the soil but away from acids.
  • Geotropism: the growth response of a plant in response to gravity. Roots exhibit positive geotropism while stems and leaves exhibit negative geotropism.
  • Thigmotropism: the growth response of a plant to physical contact (touch). Plants that cling to physical structures such as walls exhibit positive thigmotropism.
  • Hydrotropism: the growth response of a plant to water. Roots exhibit positive hydrotropism.

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