Isogamous means

1. Both the gametes are equally motile

2. Both the gametes are unequal in terms of motility

3. Both the gametes are similar in size

4. All of these

(1) Gametes dissimilar in size

(2) Gametes are similar in size but not in motility

(3) Gametes are similar in motility but not in size

(4) Gametes are similar in size and motility

(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