12th Class Biology MCQS Some Major Ecosystem

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A change in the community structure of an ecosystem over a period of time is:
Ecological niche
Ecological mutation
Genetic Drift
Succession

In oceans especially in tropical regions temperature of surface water is about
10oC
25oC
15oC
35oC

Modern man is called
Homo sapiens
Homo habilis
Homo erectus
Homo neanderthalensis

A form of air pollution in which airbone acids produced by electric utility plants and other sources fall to Earth in distant regions is
Drizzling
Heavy rain
Basic rain
Acid rain

The decline in thickness of the ozone layer is caused by increasing level of
Chlorine
Chlorofluorocarbon
Carbon dioxide
Nitrogen

What would be expected to happen if all the nitrogen-fixing organisms ceased to exist?
All organisms would die out
There would be no significant change in number of animals
The nitrogen level of the atmosphere would be increase
The total number of biomass would be reduced

The fossil fuels are
Coal
Oil
Gas
All a,b and c

Only 30% of the earth is dry land the remainder being covered with
Trees
Grass
Water
Air

The best way to increase food production from ecosystem view point is:
Use of genetically improved varieties of seeds
Use of excessive fertilizers
Use of high quality pesticides
To increase cultivable land by clearing forest

The study of hman populations and things that affect them is called:
Angiography
Mammography
Demography
Homography

Rain that falls on high areas such as mountains possesses large amount of garvitational
Kinetic energy
Heat energy
Electrical energy
Potential energy

Which statement defines the net primary production in an ecosystem over a given time period?
The total amount of organic matter in all organisms present
The total amount of organic matter in the plants in excess of that used in respiration
The total amount of photosynthesis product from all plants
The total amount of organic matter used in respiration by all the organisms present

A pesticide is a chemical which destroys agricultural
Pests
Both a & b
Crops
Competitors

The total energy from the sun is happened by the producers in an ecosystem is about?
10%
20%
1%
5%

Air is being polluted rapidly due to
Sewage
Automobiles
Industrialization
Both a & b

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