Azolla enriches rice fields with nitrogen due to its association with [Wardha 2001 ; Chd…

Biology · NEET · NTA ExamsBiological Classification

Azolla enriches rice fields with nitrogen due to its association with  [Wardha 2001; Chd. CET 2001; CBSE PMT (Pre.) 2012]
Or
A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is
  [NCERT Pg. No. 158][CBSE PMT 2004]
  1. Anabaena
  2. Nostoc
  3. Rhizobium
  4. Frankia

Answer

(A) Anabaena

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