Cyanobacteria are used in agricultural fields for crop improvement because they cause

N_{2}

fixation

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Solution

The correct option is A $N_{2}$ fixation
Because of their activity of fixing atmospheric nitrogen and make it available to plants(as plants cannot directly use nitrogen). This improves the yield of the crop and also reduces the cost of nitrogen fertilizers. Eg Anabena, Nostoc.
So the correct option is "N2 fixation".

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What is the principle underlying the use of cyanobacteria in agricultural fields for crop improvement?

In crop improvement haploids are important because they

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2. Applied biotechnology is used in agriculture field to improve yield and variety

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