MCQ on Biogeochemical Cycle (Nutrient cycle)

1. The main nitrogen reservoir in the biosphere is  
a) rock
b) ocean
c) organism
d) atmosphere

2. The sedimentary cycle is

3. Which is the most common available form of S to plants
a) S
b) SO2
c) SO24+
d) H2S

4. Phosphorus cycle in the form of
c) PO42-
d) AIPO3
MCQ on Biogeochemical Cycle - MCQ on Nutrient cycle

5. The largest reservoir of phosphorus in the biosphere is the
b) rock
c) organism
d) ocean

6. Fixation occur with the help of
 a)symbiotic bacteria
b)with the help of nitrogenise enzyme
c)leguminous nodules
d)all of these

7. Among the following biogeochemical cycles which one does not have losses due to respiration?
d)all of these

8. The Phosphorus cycle is unusual in that it is entirely
a)within the aquatic ecosystem
b) within the terrestrial ecosystem
c) gaseous
d) sedimentary

9. Nitrogen is critical elements of the ecosystem because it is
a) labile
b) fixed by microbes
c) abundant in atmosphere
d) essential element

10. Which of the following atoms most often limits the primary productivity of an ecosystem?
a) Carbon
b) Nitrogen
c) Sulphur
d) Phosphorus
1. d) atmosphere
2. d)phosphorus
3. c) SO24+
4. c) PO42-
5. b) rock 
6. d)all of these
7. d)all of these
8.d) sedimentary
9.d) essential element
10. d) Phosphorus

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