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Q.

Nitrogen fixation in root nodules of Alnus is brought about by:

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a

Frankia

b

Azorhizobium

c

Bradyrhizobium

d

Clostridium

answer is A.

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Detailed Solution

Concept: Nitrogen is known as the vital element. The atmosphere is the greatest reservoir of nitrogen so it's present within the air within the abundant form.The molecular nitrogen found in the air cannot be used directly by plants; instead, it must first be transformed into compounds. The symbiotic biological process that takes place on the roots of leguminous plants includes Rhizobium species.
However, non-leguminous plants like Alnus are required to produce nodules and other structures, such as compound nitrogen. The actinomycete Frankia is the most well-known example of an organism involved in nodule formation.
Hence, option 1 is the correct answer.

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Nitrogen fixation in root nodules of Alnus is brought about by: