The glycocalyx of fibers on some bacteria is made up of:

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.

Some microorganisms grow and multiply at temperatures of $100-105^{\circ}C$. They are included in:

Which of the following are found in extreme saline conditions?

Which of the following organisms derives energy for $N_2$ fixation through photosynthesis?

Identify the correct option for the given figure.