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Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination3 Marks
Question
How do tropisms differ from nasties (or nastic movements)?
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Answer

Tropisms:
  1. These movements are always in the direction of the stimulus.
  2. These movements are slow.
  3. These movements are exhibited by all parts of a plant. For example, movement of shoot towards the light and not towards.
Nasties:
  1. These movements are neither away nor towards the stimulus.
  2. These movements are fast.
  3. These movements are exhibited by the flat organs (like leaves and petals of flowers) of a plant. For example, the bending and dropping of leaves in ‘Touch-me-not’ plant.

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