Germpores in pollen grains in spermatophytes are

Options

A. Thin area in intine
B. Thin area in exine
C. Thick area in exine
D. Site of pollen tube entry

Answer

### Step-by-Step Solution:

1. **Understanding Pollen Grains**:
- Pollen grains are the male gametophytes or microspores in spermatophytes (seed-bearing plants). They are microscopic structures that vary in shape and size.

2. **Structure of Pollen Grains**:
- Pollen grains consist of two layers:
- **Inner Layer**: Known as the entine.
- **Outer Layer**: Known as the exine, which is composed of a durable substance called sporopollenin.

3. **Germ Pores**:
- Germ pores are specific areas on the exine where the outer layer is thinner. These pores allow for the emergence of the pollen tube during germination.

4. **Function of Sporopollenin**:
- Sporopollenin serves to protect the pollen grains from environmental damage, preventing them from rupturing due to wind, water, or other external factors.

5. **Analyzing the Options**:
- **Option 1**: Thin area in entine - Incorrect, as germ pores are not found in the entine.
- **Option 2**: Thin area in exine - Correct, as germ pores are located in the exine where it is thinner.
- **Option 3**: Thick area in exine - Incorrect, as germ pores are not located in the thick areas of the exine.
- **Option 4**: Site of pollen tube entry - Incorrect, as germ pores are not specifically designated as the entry point for the pollen tube.

6. **Conclusion**:
- The correct answer is that germ pores in pollen grains of spermatophytes are found in the thin area of the exine.

### Final Answer:
Germ pores in pollen grains in spermatophytes are **thin areas in the exine**.

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