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Johnson (1829) discovered (a) Hydrotropi...

Johnson (1829) discovered
(a) Hydrotropism
(b) Phototropism
(c) Geotropism
(d) Photonasty

A

Hydrotropism

B

Phototropism

C

Geotropism

D

Photonasty.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding what Johnson discovered in 1829, we need to analyze the options provided: 1. **Understanding the Options**: - (a) Hydrotropism: This refers to the growth or movement of a plant in response to water. - (b) Phototropism: This is the growth or movement of a plant in response to light. - (c) Geotropism: This is the growth or movement of a plant in response to gravity. - (d) Photonasty: This is a non-directional movement of a plant in response to light. 2. **Identifying Johnson's Discovery**: - According to the information provided, Johnson discovered hydrotropism in 1829. This means that he identified how plants respond to water stimuli. 3. **Clarifying Other Terms**: - Phototropism and geotropism were discovered by Charles Darwin. Phototropism involves the plant's response to light, while geotropism involves the plant's response to gravity. - Photonasty, which is a non-directional response to light, was discovered by Paul V. 4. **Conclusion**: - Based on the information, the correct answer to the question is (a) Hydrotropism. ### Final Answer: **(a) Hydrotropism**
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