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

Cyanobacteria, or blue-green algae, are photosynthetic microorganisms capable of oxygenic photosynthesis. Their ability to fix atmospheric nitrogen is crucial for agriculture, as it improves soil fertility.

The following organisms were evaluated to determine which are cyanobacteria:

• (A) Nucleopolyhedrovirus: This is a virus that infects insects and is not a cyanobacterium.
• (B) Anabaena: This is a cyanobacterium found in aquatic and soil environments, recognized for its nitrogen-fixing capability.
• (C) Nostoc: A cyanobacterium that forms symbiotic relationships with plants and participates in nitrogen fixation.
• (D) Oscillatoria: A filamentous cyanobacterium inhabiting freshwater and marine ecosystems, characterized by its oscillatory movement.

The organisms identified as cyanobacteria are:

(B)	Anabaena
(C)	Nostoc
(D)	Oscillatoria

The correct identification includes: (B), (C), and (D) only.