Thigmotropism is best exhibited by

Options

A. Lamina
B. Tendrils
C. Root apex
D. Tendrils

Answer

**Step-by-Step Solution:**

1. **Understanding Thigmotropism**: Thigmotropism is a type of plant growth response to touch stimuli. It is characterized by the growth of a plant in response to physical contact with an object.

2. **Identifying Plant Parts Exhibiting Thigmotropism**: Thigmotropism is commonly observed in specific parts of plants, particularly in climbing plants or those that have tendrils. These tendrils are specialized structures that help the plant to cling and support itself as it grows.

3. **Evaluating the Options**: The question provides four options:
- (a) Lamina
- (b) Tendril
- (c) Root apex
- (d) Tendril (repeated)

4. **Analyzing Each Option**:
- **Lamina**: This is the leaf blade of a plant and does not exhibit thigmotropism.
- **Tendril**: Tendrils are specialized structures that respond to touch and exhibit thigmotropism. They wrap around objects for support.
- **Root Apex**: The root apex is involved in growth but does not exhibit thigmotropism.
- **Tendril (again)**: This option is the same as the second and is correct.

5. **Conclusion**: The best answer to the question "Thigmotropism is best exhibited by" is the tendril.

**Final Answer**: Tendril

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