Neet Solved Paper 2013 Question 22
Question: The first stable product of fixation of atmospheric nitrogen in leguminous plants is
Options:
A) $ NO_2^{-} $
B) ammonia
C) $ NO_3^{-} $
D) glutamate
Show Answer
Answer:
Correct Answer: B
Solution:
The process of conversion of nitrogen (N2) to ammonia is termed as nitrogen fixation.
$ \underset{\text{(Nitrogen)}}{\mathop{{N_2}\to }}\ \underset{\text{(Dimide)}}{\mathop{{N_2}{H_2}}}\ \to \underset{\text{(Hydrazine)}}{\mathop{{N_2}{H_4}\to }}\ \underset{\text{(Ammonia)}}{\mathop{2N{H_3}}}, $ $ 2NH _3+3O _2\xrightarrow[{}]{{}}2NO_2^{-}+2{H^{+}}2H _2O $ $ 2NO _2+O _2\xrightarrow[{}]{{}}2NO_3^{-} $
In reductive animation ammonia reacts with $ \alpha\text{ -} $ ketoglutaric acid and forms glutamic acid
$ \alpha\text{ -} $ ketoglutaric acid $ +NH_4^{+}+NADPH $ $ \xrightarrow[Dehydrogenae]{Glutamate}Glutamat,\text{+},{H_2}O,\text{+},NADP $
