What is the term used for a plant body that lacks tissues and organs?

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

Ulothrix occurs in

The algae used in space research is

$A$: Pyrenoids may or may not be surrounded by a sheath of starch plates in algae.
$R$: In higher plants,these are replaced by amyloplasts.

State the location and composition of pyrenoids.