Question

Which of the following has the larvicidal properties?

• A. Azolla
• B. Anabaena
• C. Nostoc
• D. None of the above

Answer 1

The correct option is A Azolla

A. Azolla

Reason: Azolla are a group of aquatic ferns belonging to the family salviniaceae. It contains an endosymbiont the nitrogen-fixing cyanobacterium anabaena azolla. They are potent wormicide and larvicide and it is commonly used by farmers in their crop fields to protect their crops from such damaging agents. Azolla plants grow as a thick mat on the surface of the water, making it more difficult for the larvae to reach the surface to breathe.