In pollen grains where sporopollenin is absent called germ pore.

Answer

### Step-by-Step Solution:

1. **Understanding Pollen Grains**: Pollen grains are the male gametes produced in flowering plants. They are crucial for the process of fertilization.

2. **Structure of Pollen Grains**: Pollen grains consist of two main layers:
- **Exine**: This is the outer layer, which is tough and made of a substance called sporopollenin.
- **Intine**: This is the inner layer, which is continuous and does not have any pores or apertures.

3. **Role of Sporopollenin**: Sporopollenin is known for its resistance to various environmental factors such as high temperatures, acids, and enzymes. This makes it an important component for the preservation of pollen grains, allowing them to be fossilized.

4. **Germ Pores**: The exine layer, while tough, has specific areas where sporopollenin is absent. These areas are referred to as **germ pores**. Germ pores are crucial because they are the points from which the pollen tube will emerge during fertilization.

5. **Evaluating the Statement**: The statement in the question claims that "in pollen grains where sporopollenin is absent, it is called a germ pore." This is indeed correct as germ pores are defined by the absence of sporopollenin.

6. **Conclusion**: Therefore, the statement is true.

### Final Answer:
The statement is true.

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