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

Question # 1

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 # 2

--------occupy the b ase of pyramid.

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Producers

Primary canivores

Herbivores

Top carnivores

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Question # 3

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

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Solid pollutant

Air pollutant

Water pollutant

Acid Rain

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Question # 4

------------- 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 # 5

Which is the solution of environmental problems.

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Reducing pollution

Plantation

Protection of endangered

All these

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Question # 6

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 # 7

------------- 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 # 8

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 # 9

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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Question # 10

Energy of ............ is trapped as chemicla energy by producers.

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Moon

Atom

Sun

Earth

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