Question # 1

As CFC_s rise to the atmosphere ultraviolet rays release

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Fluorine

Chlorine

Carbon

Hydrogen

Northern coniferous forest are called.

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Alpine

Boreal

Taiqa

Prairles

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

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10^oC

15^oC

25^oC

35^oC

Which of the following is the most fragile ecosystem.

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Grass land

Wood land

Tundra

Savanna

A pesticide is a chemical which destroys agricultural

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Pests

Competitors

Crops

Both a & b

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

a succulent plant has water stored in tissue.

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Cacti

Moss

Yarrow

Spruce

Water used for industrial purposes is about

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9%

90%

70%

50%

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

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Chlorofluorocarbon

Nitrogen

Chlorine

Carbon dioxide

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

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

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20 %

10 %

5 %

1 %

In spermatophytes important step in land adaptation is the evolution.

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Seed coat

Fruit

Pollen tube

Flower

The causes of green house effect are:

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Over urbanization

Deforestation

Industrialization

All of them

Desert ecosystem of Bhakkar and Mian wali is called.

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Thal

Thar

Cholistan

Rohi

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

The average rain fall in temperate deciduous forest is between

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600-1500 mm

650 -1500 mm

750-1500 mm

700 -1500 mm

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Biology FSC Part 2 Chapter 26 Online MCQ's Test MCQs With Answers

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