Ques. 1AIPMT 2010 (Mains)
Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D. [figure]
- array|l|l|l|l| A & B & C & D \ Nitrification & Ammonification & Animals & Plants \ array
- array|l|l|l|l| A & B & C & D \ Denitrification & Ammonification & Plants & Animals \ array
- array|l|l|l|l| A & B & C & D \ Nitrification & Denitrification & Animals & Plants \ array
- array|l|l|l|l| A & B & C & D \ Denitrification & Nitrification & Plants & Animals \ array
Answer
(2) array|l|l|l|l| A & B & C & D \ Denitrification & Ammonification & Plants & Animals \ array
Solution
As per NCERT (nitrogen cycle):
A: nitrate of the soil is reduced back to atmospheric N2 by denitrification (e.g. Pseudomonas, Thiobacillus).
B: the organic nitrogen of decaying biomass is converted to ammonia by ammonification.
C: plants take up nitrate from the soil pool (uptake).
D: plants are eaten by animals; both plants and animals finally form the decaying biomass.
A = Denitrification, B = Ammonification, C = Plants, D = Animals
Answer: (2)
Out of syllabus