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NEET 2004
Exam
NEET
Year
2004
Subject
Botany
Chapter
Mineral Nutrition

NEET 2004 · Botany · Mineral Nutrition

A free living nitrogen-fixing cyanobacterium which can also form...

A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is:

Options

  1. ATolypothrix
  2. BChlorella
  3. CNostoc
  4. DAnabaena.

Correct answer

D. Anabaena.

Step-by-step solution

Azolla (water fern) and the blue-green alga Anabaena azollae maintain a symbiotic relationship where the alga provides nitrogen to the fern, and the fern provides a habitat for the alga. Related Theory Frankia show nitrogen fixation in both symbiotic association with actinorhizal plants, Casuarina and free-living aerobic conditions, while most Rhizobia fixes nitrogen in symbiotic form only.
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