Pyrenoids are characteristically foundin algae. A pyrenoid consists of :-

Options

A. Core of starch surrounded by protein
B. Core of protein surrounded by starch
C. Core fatty acids covered by starch
D. Nucleic acid and protein

Answer

To answer the question regarding what a pyrenoid consists of, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Pyrenoids**:
- Pyrenoids are specialized structures found in the chloroplasts of algae and some land plants. They play a crucial role in the carbon concentrating mechanism.

2. **Composition of Pyrenoids**:
- Pyrenoids consist of a central core and a surrounding layer. The core is primarily made up of a specific substance, while the outer layer consists of another substance.

3. **Identifying the Core and Surrounding Layer**:
- The core of the pyrenoid is made of starch, which is a carbohydrate. This starch is essential for the storage of energy and plays a role in the fixation of carbon dioxide.

4. **Surrounding Layer**:
- Surrounding the starch core is a layer of protein. This protein is crucial for the functioning of the pyrenoid and assists in the carbon fixation process.

5. **Conclusion**:
- Based on the above understanding, we can conclude that a pyrenoid consists of a core of starch surrounded by protein.

### Final Answer:
A pyrenoid consists of a core of starch surrounded by protein.