Germ pore/germinal furrow present on the surface of pollen grain represents

Options

A. Area where exine is thin or absent
B. Specialised thickening of exine
C. Specialised thickening of intine
D. Area where tectum is absent.

Answer

To solve the question regarding the germ pore or germinal furrow present on the surface of a pollen grain, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Pollen Grain**:
- Pollen grains have a wall that consists of two layers: the outer layer called the exine and the inner layer called the intine.

2. **Composition of Exine**:
- The exine is primarily made up of a substance known as sporopollenin, which is one of the most resistant biological materials.

3. **Characteristics of Exine**:
- Initially, the exine is thin but becomes thicker as the pollen grain matures.

4. **Identification of Germ Pores**:
- The exine is not uniform; it can be discontinuous or ruptured in certain areas. These areas are referred to as germ pores or germinal furrows.

5. **Function of Germ Pores**:
- The germ pores are critical as they are the locations through which the pollen tube emerges during the process of germination on the stigma of a flower.

6. **Conclusion**:
- Based on the above information, the germ pore represents the area where the exine is thin or absent.

### Final Answer:
The germ pore/germinal furrow present on the surface of the pollen grain represents the area where the exine is thin or absent.