Exine and intine are the parts of

Options

A. Embryo sac
B. Pollen grain
C. Stigma
D. Seed

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the parts known as Exine and Intine. We need to identify which structure they belong to.

2. **Identifying the Options**: The options provided are:
- a) Embryo sac
- b) Pollen grain
- c) Stigma
- d) Seed

3. **Analyzing the Terms**:
- Exine and Intine are terms related to the structure of pollen grains.
- Exine refers to the outer layer of the pollen grain wall, while Intine refers to the inner layer.

4. **Confirming the Structure**:
- Pollen grains are microscopic structures that contain both Exine and Intine as their layers.
- The Exine is made of a tough material that helps protect the pollen grain, while the Intine is composed of cellulose and pectin.

5. **Conclusion**: Based on the definitions and the structure of pollen grains, the correct answer is that Exine and Intine are parts of the **pollen grain**.

**Final Answer**: Exine and Intine are parts of **pollen grain**.

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