(i) Green algae occur in fresh water, brackish water, salt water.

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

(iii) 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 alga 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 + agar.

(vii) 2 – 8, equal and apical flagella in green algae. 

(a) All are correct

(b) All are false

(c) (i) and (vi) are correct

(d) (ii), (iii) and (v) are correct