The outer layer of pollen is made up of :

Options

A. Pollenin
B. Sporopollenin
C. Pectin
D. Cellulose

Answer

**Step-by-Step Solution:**

1. **Understanding Pollen Structure**: Pollen grains have two main layers: the outer layer called the exine and the inner layer known as the intine.

2. **Identifying the Outer Layer**: The outer layer (exine) is crucial for the protection and integrity of the pollen grain.

3. **Composition of the Exine**: The exine is primarily made up of a substance known as sporopollenin. This is a complex polymer that is resistant to degradation.

4. **Properties of Sporopollenin**: Sporopollenin is a cross-linked polymer composed of carbon, hydrogen, and oxygen. Its structure provides strength and protection to the pollen grains, making them resilient against environmental stresses.

5. **Conclusion**: Given the properties and composition of the outer layer of pollen, the correct answer to the question is that the outer layer of pollen is made up of sporopollenin.

**Final Answer**: The outer layer of pollen is made up of **Sporopollenin**.

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