Question # 1

Lavering is the characteristic of.

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Tundra

Desert

Grass land

Talga

Which of the following is NOT recycled in ecosystem?

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Carbon

Sulphur

Energy

Water

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

Air is being polluted rapidly due to

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Industrialization

Automobiles

Sewage

Both a & b

The total energy from the sun is happened by the producers in an ecosystem is about?

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20 %

10 %

5 %

1 %

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

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cyprus

Siberia

Morocco

Nepal

Cacti and Euphorbia are the desert plants which store water in their.

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Fleshy leaves

Freshy stems

Freshy roots

Freshy buds

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

Fresh water ecosystem covers less than.

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1%

3%

5%

7%

Coniferous forest located at high attitude are called.

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Boreal

Alpine

Talga

Prailes

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

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Forest

Savanna

Grass land

Desert

A change in the community structure of an ecosystem over a period of time is:

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Ecological niche

Ecological mutation

Succession

Genetic Drift

Oxone molecule is made up by binding of three atoms of

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Nitrogen

Oxygen

Hydrogen

Carbon

a succulent plant has water stored in tissue.

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Cacti

Moss

Yarrow

Spruce

The earth surface covered with water is

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35%

11%

21%

33%

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

As CFC_s rise to the atmosphere ultraviolet rays release

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Fluorine

Chlorine

Carbon

Hydrogen

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