Expansion of a leaf is an example of

Options

A. Nutation
B. Nastic movement
C. Ephemeral movement
D. Paratonic movement.

Answer

To determine the correct answer to the question "Expansion of a leaf is an example of," we can analyze the options provided:

1. **Nutation**: This refers to a bending movement of a plant, typically involving the tip of a plant organ moving in a circular or spiral pattern. It is not specifically related to the expansion of a leaf.

2. **Gnostic Movement**: This type of movement occurs in response to a specific stimulus. An example is the movement of a sensitive plant when touched, where the plant moves away from the point of contact. This is not related to the expansion of a leaf.

3. **Ephemeral Movement**: Also known as directional growth, this refers to growth that occurs in a particular direction but is not specifically about leaf expansion.

4. **Paratonic Movement**: This is the growth of a plant in response to an external stimulus, such as light (phototropism), where the plant grows towards the light source.

After analyzing these options, we can conclude that the expansion of a leaf is best described as a **nutation** movement, as it involves bending and growth patterns.

### Final Answer:
The expansion of a leaf is an example of **Nutation**.

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