Pigment-containing membranous extensions in some cyanobacteria are

Options

A. Penumatophers
B. Chromatophores
C. Heterocysts
D. Basal bodies

Answer

**Step-by-Step Solution:**

1. **Understanding Cyanobacteria**: Begin by recognizing that cyanobacteria are a type of bacteria capable of photosynthesis, similar to plants. They contain pigments that are essential for the process of photosynthesis.

2. **Identifying Membranous Extensions**: The question asks about pigment-containing membranous extensions in cyanobacteria. This suggests we need to identify a specific structure within these bacteria that contains pigments.

3. **Evaluating Options**:
- **Pneumatophores**: These are specialized structures found in some plants that facilitate gas exchange. Since they are not found in cyanobacteria, this option is incorrect.
- **Chromatophores**: These are indeed pigment-containing membranes found in cyanobacteria. They play a crucial role in photosynthesis by containing chlorophyll and other pigments.
- **Heterocysts**: These are specialized cells in some cyanobacteria that are involved in nitrogen fixation, not pigment storage. Thus, this option is also incorrect.
- **Basal Bodies**: These structures are associated with the movement of flagella in cells and do not contain pigments. Therefore, this option is incorrect as well.

4. **Conclusion**: After evaluating all the options, the correct answer is **chromatophores**, as they are the pigment-containing membranous extensions in cyanobacteria.

**Final Answer**: Chromatophores

---