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BIOLOGY CH19 Plant Physiology — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9ScienceBIOLOGY CH19 Plant Physiology2 Marks
MCQ
While conducting experiments to study the effects of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X however bends ” away from stimulus A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to factors related with Earth. Keeping these points in mind, answer the following questions:
  • ✓
    What could be stimulus A ?
  • B
    Name the stimulus seen in B.
  • C
    What could be stimulus-C?
✓

Answer

Correct option: A.
What could be stimulus A ?
(a) Stimulus A – Water(b) Stimulus B – Gravity(c) Stimulus C – Light

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