Which of the following movements may be found in blue-green algae?

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.

Which of the following statements regarding cyanobacteria is incorrect?

In blue-green algae,photosynthesis occurs in .........

Branched chain lipids occur in the cell membranes of

Assertion: Chemosynthesis is an autotrophic nutrition.
Reason: Chemoautotrophs contain chlorophyll pigments.