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

How many organisms in the list given below are autotrophs?

1. Five
2. Six
3. Three
4. Four