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Exine of pollen grain is made up of...

Exine of pollen grain is made up of

A

Pectocellulose

B

Lignocellulose

C

Sporopollenin

D

Pollen kit

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Pollen Grain Structure**: Pollen grains consist of two main layers - the outer layer known as the exine and the inner layer known as the intine. 2. **Identifying the Exine**: The exine is the outer layer of the pollen grain. It is important to note that the exine is not a continuous layer; it has areas of discontinuity. 3. **Germ Pore**: Between the discontinuities of the exine, there are openings called germ pores. These are crucial for the pollen tube to extend during fertilization. 4. **Composition of Exine**: The exine is primarily made up of a substance called sporopollenin. This is a complex biopolymer that is known for its durability and resistance to degradation. 5. **Conclusion**: Therefore, the exine of the pollen grain is made up of sporopollenin, which is recognized as one of the hardest substances known in biological materials. **Final Answer**: The exine of the pollen grain is made up of sporopollenin. ---
**Step-by-Step Solution:** 1. **Understanding Pollen Grain Structure**: Pollen grains consist of two main layers - the outer layer known as the exine and the inner layer known as the intine. 2. **Identifying the Exine**: The exine is the outer layer of the pollen grain. It is important to note that the exine is not a continuous layer; it has areas of discontinuity. 3. **Germ Pore**: Between the discontinuities of the exine, there are openings called germ pores. These are crucial for the pollen tube to extend during fertilization. ...
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Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

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