In calotropis , the leaves show (X ) phyllotaxy while the petals show (Y) aestivation.

Options

A. (X) : opposite and (Y) : valvate
B. (X) : alternate and (Y) : valvate
C. (X) : opposite and (Y) : twisted
D. (X) : alternate and (Y) : twisted

Answer

To solve the question regarding the types of phyllotaxy and aestivation in Calotropis, we will break it down step by step.

### Step-by-Step Solution:

1. **Understanding Phyllotaxy**:
- Phyllotaxy refers to the arrangement of leaves on a plant stem. There are three main types of phyllotaxy: alternate, opposite, and whorled.

2. **Identifying the Type of Phyllotaxy in Calotropis**:
- In Calotropis, the leaves exhibit an **opposite phyllotaxy**. This means that from each node on the stem, two leaves arise directly opposite each other.

3. **Understanding Aestivation**:
- Aestivation refers to the arrangement of sepals and petals in a flower bud before it opens. There are several types of aestivation, including valvate, imbricate, and twisted.

4. **Identifying the Type of Aestivation in Calotropis**:
- In Calotropis, the petals show **valvate aestivation**. This means that the petals are arranged in such a way that they touch each other at the margins without overlapping.

5. **Final Answer**:
- Therefore, for the question, we conclude that in Calotropis, the leaves show **(X) opposite phyllotaxy** and the petals show **(Y) valvate aestivation**.

### Summary:
- X = Opposite Phyllotaxy
- Y = Valvate Aestivation