Shape and number of chloroplast in different members of algae is different
Chlamydomonas – cup shaped, 1/cell
Zygnema – Stellate, 2/cell
Spirogyra – Spiral, 1/ cell
Ulothrix – Collar shaped, 1/cell

Correct Option: B

Shape and number of chloroplast in different members of algae is different
Chlamydomonas – cup shaped, 1/cell
Zygnema – Stellate, 2/cell
Spirogyra – Spiral, 1/ cell
Ulothrix – Collar shaped, 1/cell

Plant body of Ulothrix and Spirogyra is gametophyte (haploid), they produce zoogametes(n) which fuse to form zygospore (2n) diploid, which is a resting spore. Under favourable condition zygospore undergoes reductional division or meiosis to produce zoospores which give rise to new plant.

Correct Option: C

Plant body of Ulothrix and Spirogyra is gametophyte (haploid), they produce zoogametes(n) which fuse to form zygospore (2n) diploid, which is a resting spore. Under favourable condition zygospore undergoes reductional division or meiosis to produce zoospores which give rise to new plant.

Spirogyra is a member of green algae which cannot fix atmospheric nitrogen. Only Nostoc and Anabaena (Blue green algae) and Azotobacter (bacteria) can fix nitrogen.

Correct Option: C

Spirogyra is a member of green algae which cannot fix atmospheric nitrogen. Only Nostoc and Anabaena (Blue green algae) and Azotobacter (bacteria) can fix nitrogen.

In chlorophyceae, sexual reproduction takes place by all the three processes
1. Isogamy – Fusion of morphologically and physiologically similar gametes.
2. Anisogamy – Morphologically similar but physiologically dissimilar gametes.
3. Oogamy – Fusing gametes are dissimilar in all respect.

Correct Option: B

In chlorophyceae, sexual reproduction takes place by all the three processes
1. Isogamy – Fusion of morphologically and physiologically similar gametes.
2. Anisogamy – Morphologically similar but physiologically dissimilar gametes.
3. Oogamy – Fusing gametes are dissimilar in all respect.

The Agar is obtained from several members of red algae such as Gracilaria, Gelidium, Chondrus etc. Agar gels are extensively used for growing microorganisms.

Correct Option: A

The Agar is obtained from several members of red algae such as Gracilaria, Gelidium, Chondrus etc. Agar gels are extensively used for growing microorganisms.