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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Botany
Chapter
Mineral Nutrition

NTA Abhyas 2020 · Botany · Mineral Nutrition

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

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

The freshwater fern Azolla harbors Anabaena (a blue-green alga) in its leaf cavities. Chlorella is simply a green alga. Nostoc and Tolypothrix are a free-living cyanobacterium involved in N_{2} fixation .
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