Occurrence of more than one type of leaves on the same plant is

Options

A. Vernation
B. Venation
C. Aestivation
D. Heterophylly

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the phenomenon where a single plant exhibits more than one type of leaf. This is a specific botanical term that describes this occurrence.

2. **Analyzing the Options**: The options provided are:
- A. Varnation
- B. Varnation (repeated)
- C. Estivation
- D. Heterophylly

3. **Evaluating Each Option**:
- **Option A (Varnation)**: This term refers to the arrangement of young leaves or leaf scales before they open. It does not relate to having multiple types of leaves on the same plant. Therefore, this option is incorrect.

- **Option B (Varnation)**: This is the same as Option A and has the same meaning. Thus, it is also incorrect.

- **Option C (Estivation)**: This term refers to the arrangement of flower parts before they open. It is not related to the leaves of the plant. Hence, this option is also incorrect.

- **Option D (Heterophylly)**: This term specifically refers to the occurrence of different types of leaves on the same plant. It is commonly observed in aquatic plants where the leaves above water differ from those submerged. This option is correct.

4. **Conclusion**: After evaluating all the options, the correct answer to the question is **D. Heterophylly**.