The leaves which fall down very soon after their formation are

Options

A. Deciduous
B. Caducous
C. Ramal
D. Cauline.

Answer

### Step-by-Step Text Solution:

1. **Understanding the Question**: The question asks about the type of leaves that fall off very soon after their formation.

2. **Identifying Leaf Types**: There are different categories of leaves based on their duration on the plant:
- **Evergreen Leaves**: These leaves remain on the plant throughout all seasons and do not shed off.
- **Deciduous Leaves**: These leaves shed off at one time, typically in response to seasonal changes, and the plant may be leafless for a period.
- **Caducous Leaves**: These leaves fall off shortly after they are formed, usually as new buds develop.
- **Rammel Leaves**: These are leaves found on lateral branches and are not specifically related to the duration of leaf retention.
- **Collyne Leaves**: These leaves are found directly on the nodes of the stem and do not pertain to the shedding of leaves.

3. **Analyzing the Options**:
- **Deciduous Leaves**: Incorrect, as they shed all at once, not shortly after formation.
- **Caducous Leaves**: Correct, as they fall off soon after formation.
- **Rammel Leaves**: Incorrect, as they are not related to the shedding of leaves based on duration.
- **Collyne Leaves**: Incorrect, as they are not related to the shedding of leaves based on duration.

4. **Conclusion**: The correct answer to the question is **Caducous Leaves**, as they are the type of leaves that fall off very soon after their formation.