One of the reasons to include cyanophyceae (cyanobacteria) in prokaryote is

Options

A. presence of mucilage sheath
B. absence of nuclear membrane
C. presence of sexuality
D. absence of flagellation

Answer

### Step-by-Step Solution:

1. **Understanding Cyanobacteria**:
- Cyanobacteria, also known as blue-green algae, are photosynthetic bacteria that are often found in aquatic environments.

2. **Classification of Organisms**:
- Organisms are classified into two main categories based on the presence or absence of a nuclear membrane: prokaryotes and eukaryotes. Prokaryotes lack a nuclear membrane, while eukaryotes have one.

3. **Characteristics of Prokaryotes**:
- Prokaryotes are characterized by:
- Absence of a nuclear membrane.
- Genetic material is present in the cytoplasm.
- Asexual reproduction (e.g., binary fission).
- Generally smaller and simpler cellular structure compared to eukaryotes.

4. **Absence of Nuclear Membrane in Cyanobacteria**:
- One of the key reasons to classify cyanobacteria as prokaryotes is that they do not possess a nuclear membrane. Their genetic material is located in the cytoplasm, which aligns with the definition of prokaryotes.

5. **Other Characteristics**:
- While cyanobacteria may have other features such as a mucilage sheath or lack of flagella, these are not definitive characteristics that separate them from eukaryotes. The absence of sexual reproduction and the presence of asexual reproduction (binary fission) further support their classification as prokaryotes.

6. **Conclusion**:
- Therefore, the primary reason to include cyanobacteria in the prokaryote category is the absence of a nuclear membrane, which is a defining characteristic of prokaryotic organisms.