The aperture present in pollen grain is called germ pore where

Options

A. Exine is present
B. Both exine and intine are absent
C. Only exine is absent
D. Only intine is absent

Answer

To solve the question regarding the germ pore in pollen grains, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Pollen Grain Structure**:
- Pollen grains are spherical structures that consist of two main layers: the outer layer called the exine and the inner layer called the intine.

2. **Identifying the Germ Pore**:
- The germ pore is a specific aperture present in the exine of the pollen grain. It is the area where the exine is either thin or absent, allowing for the emergence of the pollen tube.

3. **Composition of Exine**:
- The exine is primarily made up of a highly resistant material called sporopollenin, which provides protection to the pollen grain.

4. **Role of Germ Pore**:
- The germ pore serves as the point from which the pollen tube will develop during the process of fertilization. This is crucial for the transfer of sperm cells to the ovule.

5. **Analyzing the Options**:
- When considering the options provided in the question, we need to determine which statement correctly describes the condition of the exine and intine at the germ pore.
- The germ pore is characterized by the absence or thinning of the exine, while the intine is still present.

6. **Conclusion**:
- Based on the analysis, the correct option is that "only exine is absent" at the germ pore, as the intine remains intact.

### Final Answer:
The aperture present in pollen grain is called the germ pore where **only exine is absent**.

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