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1. Question marks are mentioned with each Question.
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1
____________________ is the process of conversion of ammonia into nitrites and nitrates.
Nitrification
Ammonification
Denitrification
None of these.
2
_______________________ is the process of conversion of nitrate salts to free nitrogen.
Nitrogenation
3
Plant produce oxygen during _____________ and utilize oxygen during _______________.
Photosynthesis, Photosynthesis
Photosynthesis, Respiration
Respiration, Photosynthesis
Respiration, Respiration
4
Nitrogen present in the atmosphere cannot be absorbed directly by most ___________________.
Plants
Animals
Both (a) and (b) are correct.
5
The amounts of various chemical materials cycling through the living and nonliving components ________________.
Are different
Almost constant
Are always varies.
6
Denitrification is the process of conversion of ___________________ to free nitrogen.
Carbon salts
Sodium salts
Nitrate salts
All of these
7
Which of the following are correct :
(a) Nitrification is the process of conversion of ammonia into nitrates.
(b) Nitrification is the process of conversion of ammonia into nitrites.
Only (a) is correct.
Only (b) is correct.
8
(a) Various human activities such as the excessive use of fossil fuels, mining and overuse of pesticides disturb the nutrient cycles.
(b) In order to maintain a balance in the biosphere, its components must be used judiciously.
9
(a) Oxygen gets removed from the air during respiration and burning.
(b) The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by photosynthesis in plants.
Only (b) is correct
10
(a) The elements which are essential for life are known as biogenic nutrients.
(b) Biogenic nutrients are absorbed by plants from the soil, water and air.
(c) Biogenic nutrients enter the living world at the producer level and get transferred to other trophic levels.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
All of these.