Meiosis does not occur in

Options

A. bacteria
B. cyanobacteria
C. plant cell
D. both a and b

Answer

### Step-by-Step Solution:

1. **Understanding Meiosis**:
- Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the production of gametes (sex cells). It is essential for sexual reproduction in organisms.

2. **Identifying Organisms**:
- The question lists four options: bacteria, cyanobacteria, plant cells, and both A and B (bacteria and cyanobacteria). We need to determine where meiosis does not occur.

3. **Meiosis in Eukaryotes**:
- Meiosis occurs in eukaryotic organisms, which include plants, animals, and fungi. These organisms reproduce sexually and require meiosis to produce gametes.

4. **Meiosis in Prokaryotes**:
- Bacteria and cyanobacteria are prokaryotic organisms. Prokaryotes do not undergo meiosis because they reproduce asexually, primarily through a process called binary fission.

5. **Conclusion**:
- Since meiosis is not present in prokaryotes (which include both bacteria and cyanobacteria), the correct answer to the question is that meiosis does not occur in both A (bacteria) and B (cyanobacteria).

### Final Answer:
Meiosis does not occur in both A (bacteria) and B (cyanobacteria).

---