Question # 1

What would be expected to happen if all the nitrogen-fixing organisms ceased to exist?

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There would be no significant change in number of animals

The total number of biomass would be reduced

All organisms would die out

The nitrogen level of the atmosphere would be increase

Water used for industrial purposes is about

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9%

90%

70%

50%

In which type of ecosystem in the smallest fraction of nutrients present in soil.

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Forest

Savanna

Grass land

Desert

The causes of green house effect are:

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Over urbanization

Deforestation

Industrialization

All of them

Air is being polluted rapidly due to

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Industrialization

Automobiles

Sewage

Both a & b

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

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cyprus

Siberia

Morocco

Nepal

Fresh water ecosystem covers less than.

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1%

3%

5%

7%

In oceans especially in tropical regions temperature of surface water is about

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10^oC

15^oC

25^oC

35^oC

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

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Chlorofluorocarbon

Nitrogen

Chlorine

Carbon dioxide

In succesion lithoseres takes place on:

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Sand

Water

Forest floor

Bare rocks

a succulent plant has water stored in tissue.

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Cacti

Moss

Yarrow

Spruce

The zoological name of leopard cat is.

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Fells domestica

Felis leo

Feilsbengalensis

Felisparodus

Coniferous forest located at high attitude are called.

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Boreal

Alpine

Talga

Prailes

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

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

Modern man is called

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Homo erectus

Homo habilis

Homo sapiens

Homo neanderthalensis

In aquatic ecosystem , near shore zone is called.

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Limnetic zone

Littoral zone

Profundal zone

Benthic zone

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