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Science 8th Class Urdu Medium Chapter 1 Online Test MCQs With Answers

Question # 1

Ozone is a layer of gases in ............. atmosphere of the Earth.

Choose an answer

Upper

Lower

Middle

Inner

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Question # 2

Half of the increase in atmospheric carbon dioxide concentrations in the last.............. years has occured since 1980

Choose an answer

100

200

300

400

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Question # 3

The organisms upon whihc a redator feeds are called.

Choose an answer

Prey

Carnivores

Herbivores

Producers

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Question # 4

The feeding level of an organism in an ecosystem is called.

Choose an answer

Food Web

Food chain

Trophical level

Secession level

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Question # 5

------------- through the food chain is one of the most important functionsof an ecosystem in maintaining balance of nature.

Choose an answer

Waisting of energy

Destroy fo energy

Transfer of energy

Produce of energy

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Question # 6

Which is the solution of environmental problems.

Choose an answer

Reducing pollution

Plantation

Protection of endangered

All these

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Question # 7

A symbiotic relationship in whihc both speciesl get benefit is called.

Choose an answer

Commensalism

Hebitate

Mutualism

Symbiosis

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Question # 8

Organism in ecologicla communits interact with one anothe rin....... major ways.

Choose an answer

Two

three

Four

Five

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Question # 9

All the food chains are joined together to form .....

Choose an answer

Food web

Ecologicla pyramid

Tropicla level

None of these

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Question # 10

The poisonous and harmsful substances which make the air unfavorable for life are called.

Choose an answer

Solid pollutant

Air pollutant

Water pollutant

Acid Rain

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