Question

Which of the following are Cyanobacteria?
(A) Nucleopolyhedrovirus
(B) Anabaena
(C) Nostoc
(D) Oscillatoria
Choose the correct answer from the options given below:

• A. (A), (B), and (D) only
• B. (A), (B), and (C) only
• C. (B), (C), and (D)
• D. (B), (C), and (D) only

Answer 1

The Correct Option is D

The correct answer is (4) (B), (C) and (D) only.

Cyanobacteria (also known as blue-green algae) are a group of photosynthetic bacteria that are found in various aquatic and terrestrial habitats. They are capable of producing their own food through photosynthesis and are known for their role in nitrogen fixation.

(B) Anabaena: Anabaena is a cyanobacterium known for its ability to fix nitrogen. It forms filaments and is often found in freshwater environments.

(C) Nostoc: Nostoc is another cyanobacterium that forms gelatinous colonies and is involved in nitrogen fixation.

(D) Oscillatoria: Oscillatoria is a type of cyanobacterium that forms long, filamentous chains. It is known for its oscillatory movement in water.

(A) Nucleopolyhedroviral is not a cyanobacterium; it is a virus that infects insects, particularly caterpillars.

Thus, the correct answer is (4) (B), (C) and (D) only, as all three of these are cyanobacteria.

Answer 2

Anabaena, Nostoc, and Oscillatoria are examples of Cyanobacteria, which are photosynthetic bacteria found in various aquatic and terrestrial habitats. Nucleopolyhe- drovirus, on the other hand, is not a cyanobacterium but a virus.