The cell wall of algae is made up of $.......$.

Which one of the following shows similarity with blue-green algae on the basis of photosynthetic pigments?

Which of the following is known as pond silk?

Select the incorrect statement regarding algae.

Provide the answers for the following analogy-based questions:
$(i)$ Flagellated : Zoospore :: Non-flagellated : ........
$(ii)$ Volvox : Colonial :: Spirogyra : .....

Which of the following algae forms a motile colony?