Germ pores in the polllen grains are regions

Options

A. That can withstand high temperature, strong acids and alkalies
B. Through which sperms are released into the female gametophyte
C. Which are made of lignin and suberin
D. Which lack sporopollenin.

Answer

To answer the question about germ pores in pollen grains, we can follow these steps:

### 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 called the intine.
- The exine is the tough outer wall, while the intine is more delicate and lies beneath the exine.

2. **Identifying Germ Pores**:
- Germ pores are specific areas on the pollen grain where the exine is absent.
- These pores allow for the emergence of the pollen tube, which is crucial for fertilization.

3. **Evaluating the Options**:
- **Option A**: Germ pores can withstand high temperature, strong acids, and alkalis.
- This is incorrect because these properties are characteristic of the exine, not the germ pores.
- **Option B**: Germ pores are the structures through which sperms are released into the female gametophyte.
- This is also incorrect; the pollen tube, which emerges from the pollen grain, is responsible for delivering sperm to the female gametophyte.
- **Option C**: Germ pores are made up of lignin and suberin.
- This is incorrect because lignin and suberin are components of the intine, not the germ pores.
- **Option D**: Germ pores lack sporopollenin.
- This is correct because sporopollenin is a component of the exine, and germ pores are the areas where the exine is absent.

4. **Conclusion**:
- Based on the evaluation of the options, the correct answer is **Option D**: Germ pores lack sporopollenin.