Which of the following is the correct pair?

Free living

N_{2}

fixing anaerobic bacteria– Azotobacter

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Symbiotic

N_{2}

fixing cyanobacteria in Azolla – Nostoc

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Mycorrhizal association with roots of Pinus – Facultative mutualism

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N_{2}

fixing bacteria in non-leguminous plants – Frankia in Alnus

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Solution

The correct option is D $N_{2}$ fixing bacteria in non-leguminous plants – Frankia in Alnus
Correct pair:
d) $N_{2}$ fixing bacteria in non- leguminous plants – Frankia in Alnus
(a) Free living $N_{2}$ fixing anaerobic bacteria–Rhodospirillum
(b) Symbiotic $N_{2}$ fixing cyanobacteria in Azolla–Anabaena
(c) Mycorrhizal association with roots of Pinus –symbiotic.

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