MCQ
Johnson $(1829)$ discovered :
- ✓Hydrotropism
- BPhototropism
- CGeotropism
- DPhotonasty
✓
Answer
Correct option: A.
Hydrotropism
Hydrotropism is the response of the plant towards the water stimulus.
It was first demonstrated by Johnson in $1829.$ During the course of his experiments, he found that when the air into the roots of seedlings penetrated, the roots continued to grow downwards.
Hydrotropism can be positive as in case of growth of roots towards the water and also negative which is shown by shoot growing away from the water source.
It was first demonstrated by Johnson in $1829.$ During the course of his experiments, he found that when the air into the roots of seedlings penetrated, the roots continued to grow downwards.
Hydrotropism can be positive as in case of growth of roots towards the water and also negative which is shown by shoot growing away from the water source.
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