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

Question # 1

The energy of the Sun in traped as chemical energy by.

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Tertiary consumers

Primary consumers

Producers

Secondary consumers

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Question # 2

------------- gas is released when dead organisms are decomposed by the decomposers.

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Oxygen

Carbon dioxide

Nitrogen

Hydrogen

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Question # 3

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

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Upper

Lower

Middle

Inner

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Question # 4

Which is the solution of environmental problems.

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Reducing pollution

Plantation

Protection of endangered

All these

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Question # 5

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

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Food Web

Food chain

Trophical level

Secession level

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Question # 6

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

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Two

three

Four

Five

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Question # 7

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

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Waisting of energy

Destroy fo energy

Transfer of energy

Produce of energy

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Question # 8

A relationship where two species live togetehr closely is called.

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Mutualism

Commensalism

Symbiosis

Hebitate

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Question # 9

During the combustion of fossil fuel. Which gas is ener the atmosphere.

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Nitrogen

Oxygen

Carbon di oxide

Hydrogen

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Question # 10

Carbon cycle and ............. cycle are teh processes in whihc these minerals circulate between the organisms and the environment.

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Hydrogen

Iodine

Oxygen

Nitrogen

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Question # 11

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

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100

200

300

400

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