Tendrils exhibit/twining of tendrils is due to

Options

A. thigmotropism
B. seismonasty
C. heliotropism
D. diageotropism

Answer

### Step-by-Step Solution:

1. **Understanding Tendrils**:
- Tendrils are specialized plant structures that help in climbing and support. They are typically found in climbing plants like peas and grapes.

2. **Observation of Tendril Behavior**:
- When a pea plant grows, it often encounters a support structure (like a stick). The tendrils of the plant will seek out this support.

3. **Movement of Tendrils**:
- The movement of tendrils towards the support is a response to touch. When the tendril comes into contact with the stick, it wraps around it.

4. **Type of Movement**:
- This movement is classified as a type of tropism, specifically **thigmotropism**. Thigmotropism refers to the directional growth of a plant in response to touch stimuli.

5. **Conclusion**:
- Therefore, the twining of tendrils is due to thigmotropism, which is the plant's response to unilateral touch stimuli.

### Final Answer:
The twining of tendrils is due to **thigmotropism**.

---