Give scientific terms for the following:
Two major wall layers of pollen grains collectively known as

Explanation

To answer the question regarding the scientific terms for the two major wall layers of pollen grains, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Identify the Structure of Pollen Grains**: Pollen grains are found in the pollen sac of the anther and have a double-layered wall structure.

2. **Define the Two Layers**:
- The **outer layer** of the pollen grain wall is called the **Exine**.
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