Which of the following is incorrect about Cyanobacteria?

1. They are photoautotrophs.

2. They lack heterocysts.

3. They often form blooms in polluted water bodies.

4. They have chlorophyll similar to green plants.

The cyanobacteria are also referred to as:

1. Protists

2. golden algae

3. Slime molds

4. Blue-green algae