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A change in the community structure of an ecosystem over a period of time is:
In oceans especially in tropical regions temperature of surface water is about
Modern man is called
A form of air pollution in which airbone acids produced by electric utility plants and other sources fall to Earth in distant regions is
The decline in thickness of the ozone layer is caused by increasing level of
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
All a,b and c
Only 30% of the earth is dry land the remainder being covered with
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:
Rain that falls on high areas such as mountains possesses large amount of garvitational
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
Both a & b
The total energy from the sun is happened by the producers in an ecosystem is about?