Opening and closing of flowers represent a kind of

Options

A. Nastic movement
B. Tropic movement
C. Nutation movements
D. Autonomic movements

Answer

To determine what kind of movement the opening and closing of flowers represents, we can analyze the options provided: Gnostic movement, tropic movement, nutation movement, or autonomic movement.

### Step-by-Step Solution:

1. **Understanding Gnostic Movements**:
- Gnostic movements are non-directional movements caused by external stimuli. They do not depend on the direction of the stimulus.
- Examples include the movement of leaves and the opening and closing of flowers.

2. **Understanding Tropic Movements**:
- Tropic movements are directional movements caused by external stimuli. They depend on the direction from which the stimulus is applied.
- Examples include the bending of plants towards light (phototropism) or away from gravity (geotropism).

3. **Understanding Nutation Movements**:
- Nutation movements involve changes in growth patterns, typically characterized by cell elongation or morphological changes in response to stimuli.
- Examples include the bending of shoots or the formation of tendrils.

4. **Understanding Autonomic Movements**:
- Autonomic movements are not caused by external stimuli but rather by internal stimuli within the plant.
- These movements result in changes in morphology, such as uneven growth of roots or shoots.

5. **Analyzing the Question**:
- The question specifically asks about the opening and closing of flowers. Since this movement is not directional and is caused by external stimuli (like light or temperature changes), it fits the definition of Gnostic movements.

6. **Conclusion**:
- Therefore, the opening and closing of flowers represent a kind of **Gnostic movement**.

### Final Answer:
The opening and closing of flowers represent a kind of **Gnostic movement**.

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