Multiple choice

Azolla enriches rice fields with nitrogen due to its association with

  1. Anabaena

  2. Nostoc

  3. Rhizobium

  4. Frankia

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

Azolla is a water fern that has a symbiotic association with the nitrogen-fixing cyanobacterium Anabaena azollae, which enriches the rice fields with nitrogen.