Multiple choice

Which of the following is used as a good biofertiliser in rice fields?

  1. Azolla

  2. Moss

  3. Green legume

  4. Cow dung

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Azolla is used as a good biofertiliser in rice fields. Azolla is a floating pteridophyte, which contains an endosymbiont, the nitrogen-fixing cyanobacterium Anabaena azollae (Nostocaceae family).