Select the incorrect statement.

Options

A. cyanobacteria contain gas filled vacuoles and lacks sap vacuoles
B. BGA contains chl a and phycobilins as characteristic photosynthetic pigments.
C. cyanobacteria cells have colourless peripheral protoplasm and coloured centroplasm containing chromatin material.
D. cyanobacteria shows comphementary chromatic adaption.

Answer

To solve the question of selecting the incorrect statement about cyanobacteria, we will analyze each statement provided:

1. **Statement 1**: "Cyanobacteria contain gas filled vacuoles and lack sap vacuole."
- **Analysis**: This statement is true. Cyanobacteria indeed have gas-filled vacuoles that help them maintain buoyancy and lack traditional sap vacuoles.

2. **Statement 2**: "BGA contain chlorophyll-A and phycobilins which act as characteristic photosynthetic pigments."
- **Analysis**: This statement is also true. Blue-Green Algae (BGA), which are synonymous with cyanobacteria, contain chlorophyll-a and phycobilins, which are essential for their photosynthetic processes.

3. **Statement 3**: "Cyanobacteria cells have colorless peripheral protoplasm which is wrong and colored centroplasm containing chromatin material."
- **Analysis**: This statement is incorrect. Cyanobacteria do not have a colorless peripheral protoplasm and a colored centroplasm. Instead, they have a structure that includes chromoplasm (colored) and centroplasm (which is typically colorless). Therefore, the description in this statement is misleading and incorrect.

4. **Statement 4**: "Cyanobacteria show complementary chromatin region that is complementary chromatin adaptation."
- **Analysis**: This statement is true. Cyanobacteria exhibit complementary chromatin regions which are adaptations that help them in their metabolic processes.

**Conclusion**: The incorrect statement is **Statement 3**: "Cyanobacteria cells have colorless peripheral protoplasm which is wrong and colored centroplasm containing chromatin material."