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Biology 10 Chapter 16
Man and his environment - 5
1.
Carbon dioxide is released by producers through?
a) Carbon cycle
b) Photosynthesis
c) Biogeochemical
d) Respiration
2.
How CO2 release in atmosphere?
a) Baring of wood
b) Decomposition
c) Respiration
d) All above
3.
Nitrogen is mainly present as?
a) Protein
b) Nucleic acids
c) Free gaseous nitrogen
d) Nitrates
4.
Nitrogen is utilized by plants as?
a) Nitrates
b) Free nitrogen
c) Proteins
d) Nucleic acids
5.
Conversion of nitrogen gas into nitrates is?
a) Nitrogen conversion
b) Nitrate formation
c) Nitrification
d) Nitrogen fixation
6.
Thunderstorm and lightering convert gaseous nitrogen into?
a) Nitrites
b) Nitrates
c) Nitrogen carbides
d) Nitrates
7.
Nitrogen oxides dissolve in water to form?
a) i. Nitrous acid
b) iii. Both i & ii
c) iv. Nitrates
d) ii. Nitric acid
8.
Biological nitrogen fixation takes place through?
a) Algae
b) Plants
c) Cyasobacteria
d) Bacteria
9.
In industrial nitrogen fixation nitrogen is combined with?
a) Oxygen
b) Hydrogen
c) Water
d) Carbon
10.
Breakdown of proteins of dead organsons and nitrogenous wastes to ammonia, is?
a) Carbonification
b) Hydrogenation
c) Nitrification
d) Ammonification
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