Select incorret option w.r.t. BGA and bacteria

Options

A. Both are prokaryote
B. BGA is not motile in any stage of life but bacteria can be
C. Heterocyst are formed in few BGA for nitrogen fixation and it is not formed in bacteria
D. BGA and bacteria both can be autotrophic and heterotrophic

Answer

To solve the question regarding the incorrect option with respect to Blue Green Algae (BGA) and bacteria, we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Understanding BGA and Bacteria**:
- Blue Green Algae (BGA), also known as cyanobacteria, are photosynthetic prokaryotes. They can perform photosynthesis like plants.
- Bacteria are a diverse group of prokaryotic microorganisms, which can be either autotrophic (self-feeding) or heterotrophic (feeding on others).

2. **Analyzing the Options**:
- **Option 1**: "Both are prokaryotes."
- This statement is **true**. Both BGA and bacteria are classified as prokaryotes.

- **Option 2**: "Blue green algae is not motile in any stage of life, but bacteria can be."
- This statement is **true**. BGA typically do not have motility, while many bacteria can move using flagella.

- **Option 3**: "Heterocysts are formed in few BGA for nitrogen fixation and it is not formed in bacteria."
- This statement is **true**. Heterocysts are specialized cells in some BGA that fix nitrogen, and they are not found in bacteria.

- **Option 4**: "Blue green algae and bacteria both can be autotrophic and heterotrophic."
- This statement is **incorrect**. BGA are primarily autotrophic (photosynthetic), while many bacteria are heterotrophic. They cannot both be classified as such simultaneously.

3. **Conclusion**:
- The incorrect option regarding BGA and bacteria is **Option 4**.

### Final Answer:
The incorrect option with respect to BGA and bacteria is **Option 4**: "Blue green algae and bacteria both can be autotrophic and heterotrophic."

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