Which of the following is incorrect about Cyanobacteria?

Options

A. They lack heteroysts
B. They often form blooms in polluted water bodies
C. They have chlorophyll 'a' similar to green plants
D. They are photoautotrophs

Answer

**Step-by-Step Solution:**

1. **Understanding Cyanobacteria**: Begin by recognizing that Cyanobacteria are often referred to as blue-green algae and belong to the kingdom Monera. They are a type of bacteria that can perform photosynthesis.

2. **Characteristics of Cyanobacteria**: Identify key characteristics of Cyanobacteria:
- They contain chlorophyll and can perform photosynthesis.
- They can fix nitrogen, which is essential for creating organic substances.
- They often form blooms in polluted water bodies.

3. **Identifying Heterocysts**: Learn about heterocysts, which are specialized cells found in some Cyanobacteria. Their primary function is nitrogen fixation, which is crucial for the growth of these organisms.

4. **Evaluating Statements**: Review the provided statements about Cyanobacteria:
- A. "Delac Heterocyst" (This statement is incorrect as it seems to be a misrepresentation or typo).
- B. "They often form blooms in polluted water bodies." (This is correct).
- C. "They have chlorophyll A similar to green plants." (This is correct).
- D. "They have photoautotrophs." (This is also correct).

5. **Conclusion**: Since the question asks for the incorrect statement about Cyanobacteria, the answer is A, which is incorrect due to its unclear wording or misrepresentation.

**Final Answer**: The incorrect statement about Cyanobacteria is A. "Delac Heterocyst".

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