The intine is made up of

Options

A. pectin
B. pecto-cellulose
C. callose
D. sporopollenin

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Pollen Grain**:
- The pollen grain consists of two main layers: the outer layer called the exine and the inner layer known as the intine.

2. **Identifying the Components of the Intine**:
- The intine is the inner layer of the pollen grain. It is crucial to understand what materials make up this layer.

3. **Composition of the Intine**:
- The intine is primarily made up of two substances: pectin and cellulose. These components provide structural support and play a role in the function of the pollen grain.

4. **Evaluating the Options**:
- If given multiple-choice options, we can analyze them:
- Option A: Pectin - This is partially correct since pectin is a component of intine.
- Option B: Pectocellulose - This is more precise as it includes both pectin and cellulose, which are the main components of the intine.
- Option C: Callus - This is incorrect as callus is not a component of intine.
- Option D: Sporopollenin - This is incorrect as sporopollenin is found in the exine, not the intine.

5. **Conclusion**:
- Based on the analysis, the most accurate answer regarding the composition of the intine is **Option B: Pectocellulose**.