Write the function of germ pores.

Explanation

### Step-by-Step Solution:

1. **Definition of Germ Pores**: Germ pores are specific areas on the outer layer of the pollen grain, known as the sporoderm, where the outer layer (exine) is discontinuous or absent.

2. **Structure of Pollen Grain**: The pollen grain consists of two layers:
- **Exine**: The outer layer made of a tough substance called sporopollenin.
- **Intine**: The inner layer made of cellulose and pectin, which is continuous.

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