Question # 1

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

Lavering is the characteristic of.

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Tundra

Desert

Grass land

Talga

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

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

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Littoral zone

Profundal zone

Limnetic zone

Deseret

What will be the age of willow tree 10 centimeter long and 70 centimeter in diameter

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40 years

50 years

60 years

70 years

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

Fresh water ecosystem covers less than.

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1%

3%

5%

7%

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

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cyprus

Siberia

Morocco

Nepal

Northern coniferous forest are called.

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Alpine

Boreal

Taiqa

Prairles

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

Ecosystem present on land or soil is called.

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Terrestrial

Atmosphere

Lithosphere

Both a and c

The earth surface covered with water is

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35%

11%

21%

33%

A pesticide is a chemical which destroys agricultural

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Pests

Competitors

Crops

Both a & b

In Sindh, the desert ecosystem is called.

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Thar

Sahara

Gobi

thal

Which of the following is NOT recycled in ecosystem?

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Carbon

Sulphur

Energy

Water

In spermatophytes important step in land adaptation is the evolution.

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Seed coat

Fruit

Pollen tube

Flower

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

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