Processes involved in nitrogen cycle — task. Science State Board, Class 9.

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Choose the correct answer:

(Note : More than one answer can also be correct)

1. Why is nitrogen scarce even though it is abundantly present in atmosphere?

all of the above
atmospheric nitrogen cannot be converted by microorganisms
atmospheric nitrogen needs to be converted
plants and animals utilise nitrogen in form of amino acids

2. Example of symbiotic bacteria that fixes nitrogen includes __________.

rhizobium
azotobacter
pseudomonas
frankia

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