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181.

Which of the following microbes produces nitrogen-fixing nodules in non-leguminous plants?

182.

N₂ + 8e + 8H⁺ + 16ATP $\to$ 2NH₃ + H₂ + 16ADP + 16 Pi
The above equation refers to

Denitrification

Thiobacillus denitrificans cause denitrification i.e., conversion of oxides of nitrogen to free N₂.

184.

Which of the following is used as a best genetic vector in plants?