Instead of using chemical fertilizers in a paddy field, a farmer thought of employing nitrogen fixation technique. Amongst the following which would be beneficial for his cause?

Glycine max - Rhizobium

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Cycas - Nostoc

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Casuarina - Frankia

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Azolla - Anabaena

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Solution

The correct option is D Azolla - Anabaena
Azolla is a pteridophyte, which contains as symbiont the nitrogen-fixing cyanobacterium Anabaena azollae. Widely cultivated in the Asian regions, Azolla is either incorporated into the soil before paddy transplanting or grown as a dual crop along with paddy. Anabaena helps in nitrogen fixation and in turn, helps in the growth of crop fields.
So, the correct option is 'Azolla - Anabaena'.

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Similar questions

Statement: Farmers must immediately switch over to organic fertilizers available instead of chemical fertilizers for better yield.

Assumptions:
I. All the farmers use only chemical fertilizers.
II. Organic fertilizers are readily available to the farmers.

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