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Outer wall (exine) of pollen grain is fo...

Outer wall (exine) of pollen grain is formed of

A

Cellulose

B

Pecto-cellulose

C

Lignin

D

Sporopollenin

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Pollen Grain Structure**: Pollen grains have two main layers: the outer layer called the exine and the inner layer known as the intine. 2. **Identifying the Composition of Exine**: The exine is the outer wall of the pollen grain. It is known for its durability and resistance to environmental factors. 3. **Key Component of Exine**: The exine is primarily made up of a complex substance called sporopollenin. This substance is unique to pollen grains and is responsible for their strength and resistance to decay. 4. **Comparing with Intine**: In contrast, the inner layer (intine) is made up of cellulose and pectin, which are more common plant cell wall components. 5. **Conclusion**: Therefore, the outer wall (exine) of the pollen grain is formed of sporopollenin. **Final Answer**: The outer wall (exine) of the pollen grain is formed of sporopollenin. ---
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(i) Draw a diagram of a section of a megasporangium of a flowering plant and label funiculus, micropyle, nucellus and embryo sac in it. (ii) Name the organic material exine of the pollen grain is made up of. How is this material advantageous to the pollen grain?

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(a) Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain ? (b) Still it is observed that it does not form a continuous layer around the pollen grain. Give reason. (c) How are 'pollen banks' useful ?

The exine of a pollen grain is composed of one of the most resistant biological matieral by which pollen grains are able to withstand extremes of temperature and dessication and cannot be degraded by any enzyme is