Question # 1

The decline in thickness of the ozone layer is caused by increasing level of

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Chlorofluorocarbon

Nitrogen

Chlorine

Carbon dioxide

The zone, rich in life, in a fresh water lake is called.

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Littoral zone

Profundal zone

Limnetic zone

Deseret

Clearance of vast areas of forest for lumber planting subsistence crops or grazing cattle is called as

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Deforestation

A-forestation

Forestation

Both a & b

Temperate deciduous forest are located in Pakistan at.

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Chilas

Mian wali

Shogran

Sindh

At the time of independence in 1947 the population of pakistan was

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10 m

20 m

25.7 m

32.5 m

In succesion lithoseres takes place on:

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Sand

Water

Forest floor

Bare rocks

A natural process in which surface soil is removed by the action of water or wind is

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Corrosion

Attrition

Erosion

Weathering

Here, light is insufficient to support photosynthesis.

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Littoral zone

Profundal zone

Limetic zone

Photoplankton zone

Modern man is called

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Homo erectus

Homo habilis

Homo sapiens

Homo neanderthalensis

The best way to increase food production from ecosystem view point is:

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To increase cultivable land by clearing forest

Use of excessive fertilizers

Use of high quality pesticides

Use of genetically improved varieties of seeds

Air is being polluted rapidly due to

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Industrialization

Automobiles

Sewage

Both a & b

Perhaps the most fragile of all the biomes, because of its short growing season is.

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Tundra

Desert

Grass land

Temperate deciduous forest

A pesticide is a chemical which destroys agricultural

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Pests

Competitors

Crops

Both a & b

The arctic tundra stretches acroos Northern North America, Northern Europe and.

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cyprus

Siberia

Morocco

Nepal

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

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Acid rain

Basic rain

Heavy rain

Drizzling

Which statement defines the net primary production in an ecosystem over a given time period?

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The total amount of organic matter in the plants in excess of that used in respiration

The total amount of organic matter used in respiration by all the organisms present

The total amount of photosynthesis product from all plants

The total amount of organic matter in all organisms present

Chilas has major terrestrial ecosystem.

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Deciduous forest

Alpine Forest

Grass land

Tundra

Water used for industrial purposes is about

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9%

90%

70%

50%

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