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NEET • BIOLOGY • ENVIRONMENTAL ISSUES

Environmental issues practice · Easy

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Showing 1-30 of 82 questions

1 Easy

1 of 82

Remembering +4 | -1

The polluting strength of sewage is usually characterized by its

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Correct option: C

BOD

Option C (BOD) is correct because Biochemical Oxygen Demand (BOD) is a measure of the organic matter in sewage, indicating its polluting strength.

2 Easy

2 of 82

Remembering +4 | -1

World most problematic aquatic weed is

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Correct option: C

Eichhornia

Option C (Eichhornia) is correct because Eichhornia (water hyacinth) is a highly invasive aquatic weed causing significant problems.

3 Easy

3 of 82

Remembering +4 | -1

Deforestation refers to

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Correct option: C

Disappearance of forests

Option C (Disappearance of forests) is correct because deforestation directly leads to the loss and disappearance of forest areas.

4 Easy

4 of 82

Remembering +4 | -1

Ozone (

{\mathrm{O}_3}

) depletion is due to

View answer and explanation

Correct option: C

CFCs

Option C (CFCs) is correct because Chlorofluorocarbons are the primary cause of ozone layer depletion.

5 Easy

5 of 82

Remembering +4 | -1

Minamata disease is caused due to presence of ………….. in water.

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Correct option: D

Mercury

Option D (Mercury) is correct because Minamata disease is a neurological disorder caused by mercury poisoning, often through the consumption of contaminated fish.

6 Easy

6 of 82

Remembering +4 | -1

Which one of the following is not a bioindicator of water pollution?

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Correct option: C

Stone flies

Option C is correct because stoneflies are sensitive to pollution and are indicators of good water quality, not pollution.

7 Easy

7 of 82

Understanding +4 | -1

Deforestation brings about

View answer and explanation

Correct option: D

Soil erosion

The correct answer is D (Soil erosion) because deforestation removes the protective tree cover, leading to increased soil erosion.

8 Easy

8 of 82

Remembering +4 | -1

Ozone depletion is occurring widely in

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Correct option: B

Stratosphere

Option B (Stratosphere) is correct because the ozone layer, which is being depleted, is located in the stratosphere.

9 Easy

9 of 82

Remembering +4 | -1

Which one of the following is a most efficient device to eliminate particulate matters from the industrial emissions?

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Correct option: D

Electrostatic precipitator

Option D (Electrostatic precipitator) is correct because electrostatic precipitators are highly efficient in removing particulate matter from industrial emissions.

10 Easy

10 of 82

Remembering +4 | -1

Montreal Protocol was signed in

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Correct option: B

1987

Option B (1987) is correct because the Montreal Protocol was signed in 1987 to address ozone depletion.

11 Easy

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Fluoride pollution mainly affects

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Correct option: A

Teeth

Option A (Teeth) is correct because fluoride pollution primarily affects teeth, causing dental fluorosis.

12 Easy

12 of 82

Remembering +4 | -1

Which treaty is related to the control of the emission of ozone-depleting substances (ODS)?

View answer and explanation

Correct option: A

Montreal Protocol (Canada) in 1987 and effective in 1989

Option A (Montreal Protocol (Canada) in 1987 and effective in 1989) is correct because the Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances.

13 Easy

13 of 82

Remembering +4 | -1

Organic farming is the technique of raising crops through the use of

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Correct option: D

All of these

Option D is correct because organic farming relies on natural methods like manure and biofertilizers, and often utilizes resistant crop varieties to minimize synthetic inputs.

14 Easy

14 of 82

Understanding +4 | -1

Assertion: The concentration of methane in the atmosphere has more than doubled in the last 250 years.

Reason: Wetlands and rice fields are the major sources of methane.

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Option A (If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion) is correct because both the assertion that methane concentration has more than doubled and the reason that wetlands and rice fields are major sources of methane are true, and the reason explains the assertion.

15 Easy

15 of 82

Remembering +4 | -1

Solid waste can be

View answer and explanation

Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because solid waste can be classified as either biodegradable or non-biodegradable.

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16 Easy

16 of 82

Remembering +4 | -1

Good ozone is formed in

View answer and explanation

Correct option: C

Stratosphere

Option C (Stratosphere) is correct because 'good' ozone, which protects us from harmful UV radiation, is primarily found in the stratosphere.

17 Easy

17 of 82

Remembering +4 | -1

The major goal of the green revolution was to

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Correct option: C

Increase agricultural production

Option C (Increase agricultural production) is correct because the Green Revolution's primary aim was to boost crop yields.

18 Easy

18 of 82

Remembering +4 | -1

Which one of the following is a major pollutant of automobile gases?

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Correct option: A

Carbon monoxide

Option A (Carbon monoxide) is correct because carbon monoxide is a major pollutant released by automobiles due to incomplete combustion of fuel.

19 Easy

19 of 82

Remembering +4 | -1

The cause of decline in the population of reptiles and birds is

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Correct option: A

DDT

Option A (DDT) is correct because DDT caused eggshell thinning in birds and reptiles, leading to population decline.

20 Easy

20 of 82

Remembering +4 | -1

Eutrophication is excessive growth of algae, plants and animals in water-bodies due to nutrient enrichment particularly with

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Correct option: A

Nitrogen and phosphorus

Option A (Nitrogen and phosphorus) is correct because eutrophication is primarily caused by excessive nitrogen and phosphorus.

21 Easy

21 of 82

Remembering +4 | -1

Which of the following are the example of industrial solid wastes?

View answer and explanation

Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because scraps and fly ash are both common byproducts of industrial processes and are considered industrial solid wastes.

22 Easy

22 of 82

Understanding +4 | -1

Which one of the following is a wrong statement?

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Correct option: D

Ozone in upper part of atmosphere is harmful to animals

Option D (Ozone in upper part of atmosphere is harmful to animals) is correct because ozone in the stratosphere is beneficial as it absorbs harmful UV radiation, protecting animals and other life forms.

23 Easy

23 of 82

Remembering +4 | -1

Cutting of trees in a forest is called

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Correct option: C

Deforestation

Option C (Deforestation) is correct because deforestation is defined as the cutting down or clearing of trees in a forest.

24 Easy

24 of 82

Understanding +4 | -1

Peroxy Acetyl Nitrate, a class of hazardous air pollutants, stems from
I.

{\mathrm{O}_2}

II.

\mathrm{S}{\mathrm{O}_\mathrm{x}}

III.

N{O_X}

IV. HC

View answer and explanation

Correct option: D

II and IV

Option C (III and IV) is correct because Peroxy Acetyl Nitrate (PAN) is formed from the reaction of nitrogen oxides (NOx) and hydrocarbons (HC) in the presence of sunlight.

25 Easy

25 of 82

Remembering +4 | -1

In scrubber, the exhaust is passed through a

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Correct option: C

Both (1) and (2)

Option A (Spray of water) is the most appropriate answer because scrubbers primarily use water to remove pollutants from exhaust gases.

26 Easy

26 of 82

Remembering +4 | -1

The Montreal protocol refers to

View answer and explanation

Correct option: C

Substances that deplete the ozone layer

Option C (Substances that deplete the ozone layer) is correct because the Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances.

27 Easy

27 of 82

Understanding +4 | -1

Given below are two statements
Statement I: Slash and burn agriculture commonly called as jhum cultivation in north - eastern states of India.
Statement II: Reforestation is the process of restoring a forest that once existed but was removed at some point of time in the past.
Choose the correct answer from the option given below:

View answer and explanation

Correct option: D

Both Statement I and Statement II are correct

The correct answer is D (Both Statement I and Statement II are correct) because both statements accurately describe slash-and-burn agriculture and reforestation.

28 Easy

28 of 82

Remembering +4 | -1

Ozone saves the biosphere by absorbing the high energy radiation called

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Correct option: B

Ultraviolet rays (UV)

Option B (Ultraviolet rays (UV)) is correct because ozone absorbs harmful ultraviolet radiation from the sun, protecting the biosphere.

29 Easy

29 of 82

Remembering +4 | -1

Catalytic converter in vehicle is used for controlling

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Correct option: A

Air pollution

Option A (Air pollution) is correct because catalytic converters are designed to reduce harmful emissions from vehicles, which contribute to air pollution.

30 Easy

30 of 82

Remembering +4 | -1

The ozone layer is found in

View answer and explanation

Correct option: C

Stratosphere

Option C (Stratosphere) is correct because the ozone layer, which absorbs harmful UV radiation, is primarily located in the stratosphere.

Revision notes and key takeaways

Review ENVIRONMENTAL ISSUES in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 82 single-correct-answer MCQs on ENVIRONMENTAL ISSUES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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