The cyanobacteria are also referred to as:

1. Protists

2. golden algae

3. Slime moulds

4. Blue-green algae

How many organisms in the list given below are autotrophs?
Lactobacillus,  Nostoc,  Chara,  Nitrosomonas,  Nitrobacter,  Streptomyces, Sacharomyces, Trypanosoma, Porphyra,  Wolfia
1.  Five
2.  Six
3. Three
4.  Four