The name cyanobacteria refers to

Blue-green algae belong to which of the following groups?

Select the incorrect statement for $Mycoplasma$:

In bacteria,the most resistant stage is

Which category includes the most abundant prokaryotes,which are useful in making curd from milk and in the production of antibiotics?

Choose the correct statements $(i - iv)$ regarding mycoplasma:
$(i)$ Mycoplasma has no cell wall.
$(ii)$ Mycoplasma is the smallest living organism known.
$(iii)$ Mycoplasma cannot survive without $O_2$.
$(iv)$ Mycoplasma are pathogenic in animals and plants.