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

To answer the question about why cyanophyceae (cyanobacteria) is included in prokaryotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Prokaryotes**:
- Prokaryotes are defined as organisms that lack a distinct nucleus and membrane-bound organelles. This is a fundamental characteristic that distinguishes them from eukaryotes.

2. **Identify Characteristics of Cyanophyceae**:
- Cyanophyceae, commonly known as cyanobacteria or blue-green algae, are photosynthetic bacteria. They are classified under prokaryotes due to their cellular structure.

3. **Evaluate the Options Given**:
- The options provided in the question are:
- Presence of mucilage sheath
- Absence of nuclear membrane
- Presence of sexuality
- Absence of flagellation

4. **Analyze Each Option**:
- **Presence of mucilage sheath**: This is not a defining characteristic of prokaryotes.
- **Absence of nuclear membrane**: This is a key characteristic of prokaryotes, as they do not have a well-defined nucleus or nuclear membrane.
- **Presence of sexuality**: This does not relate to the classification of prokaryotes.
- **Absence of flagellation**: Some prokaryotes do have flagella, so this is not a defining feature.

5. **Select the Correct Answer**:
- Based on the analysis, the most appropriate reason for including cyanophyceae in prokaryotes is the **absence of nuclear membrane**. This aligns with the fundamental definition of prokaryotes.

### Final Answer:
One of the reasons to include cyanophyceae (cyanobacteria) in prokaryotes is the **absence of nuclear membrane**.

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