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NEET Practice Questions (MCQs) with Answers & Solutions

Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

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Which plant is known as ‘Terror of Bengal’?

Chara

Wolffia

Hydrilla

Eichhornia

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Which is worldâ€™s most problematic aquatic weed?

A. Chara B. Wulffia C. Hydrilla D. Eichhornia

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Which compound used in refrigerator is a source of chlorine

A. Freon B. HFC C. BHC D. None

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What is biological magnification of DDT in large size fish eating birds?

A. 25ppb B. 25ppm C. 2.5ppm D. 0.25ppm

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By which method large number of particles of pollutants are separated?

A. Cyclone collector B. Porous filter C. Electrostatic precipitator D. By using solvent

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The population of eagles and hawks is declining because of,

Food scarcity

game lovers

Harmful effects of pesticides

Very few dead animals are found in fields

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Explanation

Using of pesticides causes thinning of egg shells of birds which leads to decline in population of birds

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BOD of a river was found to be very low, this means the water

A. Was clean B. Was polluted C. Contains algae D. Contains other dissolved minerals

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More pollution loads in lake, no self purification because.

There is no O₂to sustain microbial activity

No sunlight available

Microbes die

Pollutants settles down at the bottom

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Warmth on the surface of the earth is due to

A. Solar radiation B. Greenhouse effect C. Geothermal energy D. all of these

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Thinning of eggshell and their premature breaking is due to

A. Eutrophication B. Globalwarming C. Green house effect D. Biological magnification

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