I. Green algae occur in fresh water, brackish water salt water.

II. Habitat of Brown algae-fresh water (rare), brackish water, salt water

Ill. Some red algae are found in fresh water, mostly occur in salt water, 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 water-surface and also at great depths in oceans where

light penetration is little.

VI. Cell wall of red algae consists of cellulose + polysulphate easters.

VII. 2 - 8, equal and apical flagella in green algae