Oogamous

(1) Non-motile male gamete

(2) Large male gamete

(3) Non-motile female gamete

(4) Small female gamete

(1) Eudorina

(2) Volvox

(3) Fucus

(4) Spirogyra

(1) Spirogyra

(2) Ulothrix

(3) Eudorina

(4) Volvox

(1) Ulothrix

(2) Eudorina

(3) Volvox

(4) Fucus

(1) Ulothrix

(2) Eudorina

(3) Spirogyra

(4) Fucus

(1) Because at least half of the total carbon dioxide fixation on Earth is carried out by algae through photosynthesis.

(2) Algae being photosynthetic can increase the level of dissolved oxygen in their immediate environment

(3) They are primary producers of energy rich compounds and form the basis of the food cycles of all aquatic animals

(4) All of the above

(1) Water soluble substance

(2) Water holding substance

(3) Hydrogen gas containing substance

(4) Oxygen gas containing substance

(1) Water holding substance

(2) Obtained from brown algae

(3) Non sulfated water holding substance

(4) All of these

(1) Water holding substance

(2) Obtained from red algae

(3) Sulfated water holding substance

(4) All of these

(1) Gelidium

(2) Gracilaria

(3) Volvox

(4) All of these