$A.$ Algae are known as primitive plants.
$R.$ The body structure of algae is simple.

Which of the following algae forms a motile colony?

$(i)$ Green algae occur in fresh water,brackish water,and salt water.
$(ii)$ Habitat of Brown algae: fresh water (rare),brackish water,and salt water.
$(iii)$ Some red algae are found in fresh water,mostly occur in salt water,and some are in brackish water.
$(iv)$ Most of the red algae are multicellular.
$(v)$ Red algae may occur in both well-lighted regions close to the water surface and also at great depths in oceans where light penetration is little.
$(vi)$ The cell wall of red algae consists of cellulose $+$ agar.
$(vii)$ $2-8$,equal and apical flagella in green algae.

Agar-agar is obtained from

The plant body having holdfast,stipe and frond is a characteristic of

What type of life cycle is observed in most algae?