1. The main nitrogen reservoir in the
biosphere is
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a) rock
b) ocean
c) organism
d) atmosphere
2. The sedimentary cycle is
a)oxygen
b)nitrogen
c)carbon
d)phosphorus
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
a)HPO3-
b)P2
c) PO42-
d) AIPO3
5. The largest
reservoir of phosphorus in the biosphere is the
a)atmosphere
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?
a)phosphorus
b)nitrogen
c)sulphur
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
- MCQ on Biogeochemical cycle
- Diagram Quiz on Nitrogen cycle
- MCQ on Nitrogen cycle
- Difference between Energy flow and Nutrient cycling
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