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.

Sexual reproduction in Ulothrix is isogamous type. Only similar type of gametes called isogametes are produced.

Correct Option: A

Sexual reproduction in Ulothrix is isogamous type. Only similar type of gametes called isogametes are produced.

Phycoerythrins are accessory photosynthetic pigments along with phycocyanins. Haematochrome is a pigment in the blood. Brown algae is brown due to fucoxanthin.

Correct Option: C

Phycoerythrins are accessory photosynthetic pigments along with phycocyanins. Haematochrome is a pigment in the blood. Brown algae is brown due to fucoxanthin.

Blue green algae or cyanobacteria are prokaryotes. Prokaryotes lack a well defined nucleus surrounded by nuclear membrane. Eukaryotes have well organised nucleus. Rhodophyceae & Chlorophyceae are members of algae which come under eukaryotes.

Correct Option: B

Blue green algae or cyanobacteria are prokaryotes. Prokaryotes lack a well defined nucleus surrounded by nuclear membrane. Eukaryotes have well organised nucleus. Rhodophyceae & Chlorophyceae are members of algae which come under eukaryotes.

Chlorella can be grown to provide human food rich in protein, lipid, carbohydrates, vitamins and minerals. Chlorella has been researched as a potential source of food and energy, because its efficiency of photosynthesis can reach 8%, which is comparable with other highly efficient crops such as sugar cane. It is high in protein and other essential nutrients. When dried, it has about 45 percent protein, 20 percent fat, 20 percent carbohydrate, 5% fiber, and 10 percent minerals and vitamins.

Correct Option: D

Chlorella can be grown to provide human food rich in protein, lipid, carbohydrates, vitamins and minerals. Chlorella has been researched as a potential source of food and energy, because its efficiency of photosynthesis can reach 8%, which is comparable with other highly efficient crops such as sugar cane. It is high in protein and other essential nutrients. When dried, it has about 45 percent protein, 20 percent fat, 20 percent carbohydrate, 5% fiber, and 10 percent minerals and vitamins.