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1
In biochemical cycles, ‘geo’ refers to the __________________ of the earth.
Air
Water
Soil
All of these.
2
In biochemical cycles, Bio refers to _______________________.
Living organisms
Non living organisms
Organic waste
Inorganic waste
3
Nutrient elements are circulated continuously between the __________________ surroundings.
Living things
Non living things
Both (a) and (b) are correct.
None of these.
4
Biogenic nutrients are absorbed by plants from the _______________________.
5
________________ is converted to complex compounds in organisms.
Ammonia
Nitrogen dioxide
Nitrogen
6
The important biogeochemical cycles in nature are ___________________.
Carbon cycle
Nitrogen cycle
Oxygen cycle
All of these
7
____________________ are circulated continuously between the living world and its nonliving surroundings.
Nutrients
Waste products
8
Which of the following process is included in Water cycle ?
Evaporation and transpiration
Condensation
Precipitation
9
____________________ is the process of conversion of ammonia into nitrites and nitrates.
Nitrification
Ammonification
Denitrification
10
Which of the following are correct :
(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.
Only (a) is correct.
Only (b) is correct.
11
(a) Nitrification is the process of conversion of ammonia into nitrates.
(b) Nitrification is the process of conversion of ammonia into nitrites.
12
(a) In biogeochemical cycle, 'bio' refers to living organisms.
(b) In biogeochemical cycle, ‘geo’ to the air, water and soil of the earth.
13
(a) The fixation of nitrogen by some nitrogen-fixing bacteria is called biological nitrogen fixation.
(b) The process of converting free nitrogen of the atmosphere into compounds of nitrogen is called nitrogen fixation.
14
(a) Plant produce oxygen during Photosynthesis.
(b) Utilize oxygen during Respiration
(c) Oxygen is utilized during combustion.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
15
(a) The process of converting free nitrogen of the atmosphere into compounds of nitrogen is called nitrogen fixation.
(b) The nitrates get stored in the soil and the atmospheric nitrogen is fixed.
(c) Nitrogen present in the atmosphere cannot be absorbed directly by most plants and animals.