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NEET • BIOLOGY • ENVIRONMENTAL ISSUES

Environmental issues practice · Hard

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Showing 1-30 of 47 questions

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1 Hard
1 of 47
Understanding +4 | -1
Assertion: Water pollutants are measured by BOD.

Reason: If BOD is more, the water is polluted.
View answer and explanation
Correct option: A
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Option A (If both Assertion and Reason are correct and Reason is the correct explanation of Assertion) is correct because BOD directly indicates the level of organic pollution in water.
2 Hard
2 of 47
Understanding +4 | -1
Assertion: Between hypolimnion and epilimnion thermocline exists.

Reason: Between the two layers, Thermocline acts as a barrier.
View answer and explanation
Correct option: A
If both assertion and reason are true and reason is the correct explanation of assertion
Option A (If both assertion and reason are true and reason is the correct explanation of assertion) is correct because the thermocline acts as a barrier between hypolimnion and epilimnion.
3 Hard
3 of 47
Remembering +4 | -1
Which of the following level of sound may damage ear drum and can impair the hearing ability permanently?
View answer and explanation
Correct option: D
150 dB
Option D (150 dB) is correct because sound levels at or above 150 dB can cause immediate and permanent damage to the ear drum and hearing ability.
4 Hard
4 of 47
Understanding +4 | -1
Assertion : Methylmercury is a highly persistent
kind of pollutant that accumulates in food chains.

Reason : Mercury pollution is responsible for
Minamata disease.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
Option B (Both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because both statements are factually accurate, but Minamata disease doesn't explain why methylmercury accumulates in food chains.
5 Hard
5 of 47
Understanding +4 | -1
Deforestation does not lead to
View answer and explanation
Correct option: A
Quick nutrient cycling
Option A (Quick nutrient cycling) is correct because deforestation disrupts nutrient cycling, slowing it down rather than speeding it up.
6 Hard
6 of 47
Understanding +4 | -1
Which of the following is the incorrect statement:
View answer and explanation
Correct option: C
Radiation, that is given off by nuclear waste is extremely beneficial to organisms
Option C is the incorrect statement because radiation from nuclear waste is harmful, not beneficial, to organisms.
7 Hard
7 of 47
Understanding +4 | -1
Assertion : Persons exposed to Chernobyl
disaster suffered with leukaemia.

Reason : Exposure of human body to radiation
causes leukaemia.
View answer and explanation
Correct option: A
If both Assertion and Reason are true and
Reason is the correct explanation of Assertion
Option A is correct because the Chernobyl disaster is known to have caused leukaemia in exposed individuals, and radiation exposure is a known cause of leukaemia.
8 Hard
8 of 47
Remembering +4 | -1
Which of the following minimum percentage of impurities by domestic sewage make the water unfit for human use?
View answer and explanation
Correct option: C
0.1
Option C (0.1) is correct because even a small percentage (0.1%) of impurities from domestic sewage can render water unfit for human use due to the presence of pathogens and pollutants.
9 Hard
9 of 47
Remembering +4 | -1
The scrubber is used mainly to remove which of the following gases from the exhaust after spraying water/lime?
View answer and explanation
Correct option: B
SO2S{O_2}
Option B (SO2S{O_2}) is correct because scrubbers are primarily used to remove sulphur dioxide (SO2S{O_2}) from exhaust gases by spraying water or lime.
10 Hard
10 of 47
Remembering +4 | -1
Which of the following is not a major contributor to the greenhouse effect?
View answer and explanation
Correct option: B
Carbon monoxide
Option B (Carbon monoxide) is correct because carbon monoxide is not a major contributor to the greenhouse effect compared to carbon dioxide, CFCs, and methane.
11 Hard
11 of 47
Remembering +4 | -1
Which one is associated with reducing the emission of CFCsCFCs?
View answer and explanation
Correct option: A
Montreal protocol
Option A (Montreal protocol) 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 like CFCs.
12 Hard
12 of 47
Remembering +4 | -1
Which of the following statements is wrong in the case of Bhopal tragedy?
View answer and explanation
Correct option: C
Radioactive fall out engulfed Bhopal
Option C (Radioactive fall out engulfed Bhopal) is correct because the Bhopal tragedy involved a gas leak, not a radioactive event.
13 Hard
13 of 47
Remembering +4 | -1
Three Mile Island in Dauphin county, Pennsylvania, USA is known for
View answer and explanation
Correct option: B
Its meltdown of nuclear reactor causing massive radiation leakage
Option B (Its meltdown of nuclear reactor causing massive radiation leakage) is correct because Three Mile Island is infamous for its nuclear accident.
14 Hard
14 of 47
Understanding +4 | -1
Assertion :α,β\alpha ,\beta and γ\gamma rays are emitted by
disintegration of atomic nuclei of radioactive
elements.

Reason : Nuclear fall out is shown by radioactive
elements.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because both statements are factually correct, but the reason does not explain the assertion.
15 Hard
15 of 47
Remembering +4 | -1
Which one of the following plants is used in
paint and varnish industry?
View answer and explanation
Correct option: C
Pinus roxburghii
Option C (Pinus roxburghii) is correct because it is a source of resin used in the paint and varnish industry.

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16 Hard
16 of 47
Understanding +4 | -1
Assertion: Deforestation sequesters CO2CO_2 from atmosphere.

Reason: Global warming is beneficial for plants and human health.
View answer and explanation
Correct option: D
If both the Assertion and Reason are incorrect.
Option D (If both the Assertion and Reason are incorrect) is correct because deforestation releases CO2CO_2 and global warming is harmful.
17 Hard
17 of 47
Remembering +4 | -1
The following plants are associated with human
health care and Bio- diesel production respectively.
View answer and explanation
Correct option: D
Digitalis and Jatropa
The correct answer is D (Digitalis and Jatropa) because Digitalis is associated with human health care (cardiac glycosides), and Jatropa is used for biodiesel production.
18 Hard
18 of 47
Understanding +4 | -1
Select the correct arrangement according of the types of ultraviolet radiations according to the intensity of their effect on human skin.
View answer and explanation
Correct option: B
UV−B>UV−C>UV−AUV\mathrm{ - }B > UV\mathrm{ - }C > UV\mathrm{ - }A
Option C (UV−C>UV−B>UV−AUV\mathrm{ - }C > UV\mathrm{ - }B > UV\mathrm{ - }A) is incorrect. The correct option is UV−B>UV−C>UV−AUV\mathrm{ - }B > UV\mathrm{ - }C > UV\mathrm{ - }A. UV-B has the most intense effect on human skin, followed by UV-C and then UV-A.
19 Hard
19 of 47
Remembering +4 | -1
What it is called when thousands of aquatic species are killed over a wide range in sea.
View answer and explanation
Correct option: B
El Nino effect
Option B (El Nino effect) is correct because El Nino is associated with widespread aquatic species mortality.
20 Hard
20 of 47
Understanding +4 | -1
There are several ways of looking at living thing, one which is at the molecular level and analytical level with regard to life could vary nearly come to:
View answer and explanation
Correct option: B
Matter energy interaction
Option B (Matter energy interaction) is correct because life at the molecular and analytical level involves interactions between matter and energy.
21 Hard
21 of 47
Remembering +4 | -1
In the last decades, most serious nuclear reactor accident created MIC gas tragedy in
View answer and explanation
Correct option: B
Ukraine (1986) and Bhopal (1984)
Option B (Ukraine (1986) and Bhopal (1984)) is correct because the Chernobyl disaster in Ukraine occurred in 1986, and the Bhopal gas tragedy in India occurred in 1984.
22 Hard
22 of 47
Understanding +4 | -1
Which one of the following statement is true?
View answer and explanation
Correct option: A
The greater the BOD of waste water, more is its polluting potential.
Option A (The greater the BOD of waste water, more is its polluting potential) is correct because a higher BOD indicates a greater amount of organic matter that needs to be decomposed, consuming more oxygen and thus causing more pollution.
23 Hard
23 of 47
Understanding +4 | -1
DDT causes egg shell thinning in birds because it inhibits
View answer and explanation
Correct option: B
Calcium ATPase
Option B (Calcium ATPase) is correct because DDT inhibits Calcium ATPase, which is crucial for calcium transport needed for eggshell formation.
24 Hard
24 of 47
Remembering +4 | -1
Which of the following is dissolved in water to make Bordeaux mixture?
View answer and explanation
Correct option: B
Copper sulphate
Option B (Copper sulphate) is correct because Bordeaux mixture, a fungicide, is made by dissolving copper sulphate and lime in water.
25 Hard
25 of 47
Remembering +4 | -1
Euro II norms stipulate that sulphur be controller at ______ ppm in diesel and ________ ppm in petrol.
View answer and explanation
Correct option: A
350; 150
Option A (350; 150) is correct because Euro II norms stipulate that sulphur be controlled at 350 ppm in diesel and 150 ppm in petrol.
26 Hard
26 of 47
Remembering +4 | -1
Which one of the following combinations is incorrect?
View answer and explanation
Correct option: A
Rio convention Air pollution
The correct answer is A (Rio convention Air pollution) because the Rio Convention is broader than just air pollution; it encompasses sustainable development and biodiversity.
27 Hard
27 of 47
Understanding +4 | -1
Assertion : Water pollution is caused by 2, 4-D
and pesticides.

Reason : 2, 4-D acts as a strong weedicide in
high concentrations.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both statements are true, the weedicide property of 2,4-D doesn't directly explain why it causes water pollution.
28 Hard
28 of 47
Remembering +4 | -1
Green muffler scheme has launched to reduce
View answer and explanation
Correct option: A
Noise pollution
Option A (Noise pollution) is correct because the Green Muffler scheme is specifically designed to reduce noise pollution by planting trees.
29 Hard
29 of 47
Understanding +4 | -1
A lake affected by high levels of artificial eutrophication will have
View answer and explanation
Correct option: A
High nutrient levels, large phytoplankton populations, and low oxygen levels at depth.
Option A (High nutrient levels, large phytoplankton populations, and low oxygen levels at depth) is correct because eutrophication leads to increased nutrients, algal blooms, and subsequent oxygen depletion as the algae decompose.
30 Hard
30 of 47
Remembering +4 | -1
Polluted water can be purified by using
View answer and explanation
Correct option: A
Microorganisms
Option A (Microorganisms) is correct because microorganisms are used in bioremediation processes to break down pollutants in water.
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 47 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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