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NEET • BIOLOGY • ENVIRONMENTAL ISSUES
Environmental issues practice · Mixed difficulty
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Showing 1-30 of 245 questions
1
Medium
1 of 245
Understanding
+4 | -1
Supreme court of India has ordered the Delhi government to take measures to improve the quality of air. The government started to use _________________ in public fleet.
View answer and explanation
Correct option: A
Of CNG, instead of diesel
Option A (Of CNG, instead of diesel) is correct because CNG is a cleaner fuel than diesel.
2
Medium
2 of 245
Remembering
+4 | -1
The unfavorable alteration of environment due to human activities is termed as
View answer and explanation
Correct option: D
Pollution
Option D (Pollution) is correct because it directly refers to the unfavorable alteration of the environment due to human activities.
3
Easy
3 of 245
Remembering
+4 | -1
The polluting strength of sewage is usually characterized by its
View answer and explanation
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.
4
Medium
4 of 245
Analyzing
+4 | -1
A lake near a village suffered heavy mortality of fishes with in a few days. Consider the following reasons for this.
(i) Lost of urea and phosphate fertilizer were used in the crops in the vicinity
(ii) The area was sprayed with DDT by an aircraft
(iii) The lake water turned green and stinky
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
(i) Lost of urea and phosphate fertilizer were used in the crops in the vicinity
(ii) The area was sprayed with DDT by an aircraft
(iii) The lake water turned green and stinky
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
View answer and explanation
Correct option: A
(i) and (iii)
Option A ((i) and (iii)) is correct because fertilizer runoff and green, stinky water are indicative of eutrophication leading to fish mortality.
5
Medium
5 of 245
Remembering
+4 | -1
Which of the following is not used for disinfection of drinking water?
View answer and explanation
Correct option: A
Phenyl
Option A (Phenyl) is correct because phenyl is an antiseptic and disinfectant used for surfaces, not for drinking water disinfection.
6
Easy
6 of 245
Remembering
+4 | -1
World most problematic aquatic weed is
View answer and explanation
Correct option: C
Eichhornia
Option C (Eichhornia) is correct because Eichhornia (water hyacinth) is a highly invasive aquatic weed causing significant problems.
7
Hard
7 of 245
Understanding
+4 | -1
Assertion: Water pollutants are measured by BOD.
Reason: If BOD is more, the water is polluted.
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.
8
Medium
8 of 245
Understanding
+4 | -1
Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may
View answer and explanation
Correct option: D
Lead to accumulation of pesticide residues in body fat
Option D is correct because pesticides, being fat-soluble, tend to accumulate in body fat over time, especially with continuous exposure.
9
Medium
9 of 245
Remembering
+4 | -1
What is the major cause of desertification?
View answer and explanation
Correct option: A
Urbanization
Option A (Urbanization) is correct because urbanization leads to habitat destruction and land degradation, contributing to desertification.
10
Easy
10 of 245
Remembering
+4 | -1
Deforestation refers to
View answer and explanation
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.
11
Easy
11 of 245
Remembering
+4 | -1
Ozone () 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.
12
Easy
12 of 245
Remembering
+4 | -1
Minamata disease is caused due to presence of ………….. in water.
View answer and explanation
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.
13
Medium
13 of 245
Remembering
+4 | -1
A sewage treatment process, in which a portion of the decomposer bacteria present in the waste is recycled into the beginning of the process, is called
View answer and explanation
Correct option: C
Activated sludge treatment
Option C (Activated sludge treatment) is correct because it involves recycling decomposer bacteria to enhance waste decomposition.
14
Medium
14 of 245
Remembering
+4 | -1
Which of the following is a prime health risks associated with greater UV radiation through the atmosphere due to depletion of stratospheric ozone?
View answer and explanation
Correct option: D
Increased skin cancer
Option D (Increased skin cancer) is correct because greater UV radiation reaching the Earth's surface due to ozone depletion significantly increases the risk of skin cancer.
15
Medium
15 of 245
Remembering
+4 | -1
The natural phenomenon of keeping earthworm due to presence of certain gases in the atmosphere is called
View answer and explanation
Correct option: C
Greenhouse effect
Option C (Greenhouse effect) is correct because the greenhouse effect is the natural process that warms the Earth due to the presence of certain gases in the atmosphere.
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16
Medium
16 of 245
Understanding
+4 | -1
Which one is incorrect for the effects of deforestation?
View answer and explanation
Correct option: C
It speeds up nutrient recycling
The correct answer is C (It speeds up nutrient recycling) because deforestation actually slows down nutrient recycling, not speeds it up.
17
Hard
17 of 245
Understanding
+4 | -1
Assertion: Between hypolimnion and epilimnion thermocline exists.
Reason: Between the two layers, Thermocline acts as a barrier.
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.
18
Medium
18 of 245
Remembering
+4 | -1
A disease caused by eating fish contaminated by industrial waste containing mercury compounds is known as
View answer and explanation
Correct option: B
Minamata disease
Option B (Minamata disease) is correct because it is caused by mercury poisoning from consuming contaminated fish.
19
Medium
19 of 245
Analyzing
+4 | -1
Identify a correct match from the following
View answer and explanation
Correct option: D
More than one option is correct
Option D (More than one option is correct) is the correct answer because options B and C are both correct matches.
20
Medium
20 of 245
Understanding
+4 | -1
Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic (free floating) algae which can accelerate which of the following phenomenon?
View answer and explanation
Correct option: D
Both (1) and (3)
Option D (Both (1) and (3)) is correct because nutrient enrichment leads to algal blooms and eutrophication.
21
Medium
21 of 245
Understanding
+4 | -1
Undesirable changes in soil profile, affecting its productivity is called
View answer and explanation
Correct option: C
Soil pollution
Option C (Soil pollution) is correct because undesirable changes in the soil profile that affect its productivity are defined as soil pollution.
22
Easy
22 of 245
Remembering
+4 | -1
Which one of the following is not a bioindicator of water pollution?
View answer and explanation
Correct option: C
Stone flies
Option C is correct because stoneflies are sensitive to pollution and are indicators of good water quality, not pollution.
23
Hard
23 of 245
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.
24
Easy
24 of 245
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.
25
Medium
25 of 245
Analyzing
+4 | -1
Assertion : Major cause of ozone depletion is
CFCs but other greenhouse gases also have a
negative effect on ozone layer.
Reason : Greenhouse gases increases the
temperature of troposphere but decreases the
temperature of stratosphere which facilitate the
ozone depletion.
CFCs but other greenhouse gases also have a
negative effect on ozone layer.
Reason : Greenhouse gases increases the
temperature of troposphere but decreases the
temperature of stratosphere which facilitate the
ozone depletion.
View answer and explanation
Correct option: A
If both Assertion and Reason are true and
Reason is the correct explanation of Assertion
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 CFCs are a major cause of ozone depletion, and greenhouse gases can indirectly contribute to it by cooling the stratosphere.
26
Medium
26 of 245
Understanding
+4 | -1
UV-rays are non-ionizing type and are lethal due to inactivation of
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because UV-rays can inactivate proteins, pigments, and nucleic acids.
27
Hard
27 of 245
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.
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
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.
28
Medium
28 of 245
Remembering
+4 | -1
According to the Central Pollution Control Board (CPCB), particles that are responsible for causing great harm to human health are of diameter
View answer and explanation
Correct option: A
2.50 micrometers
Option A (2.50 micrometers) is correct because the Central Pollution Control Board (CPCB) identifies particles with a diameter of 2.5 micrometers (PM2.5) as causing the greatest harm to human health.
29
Medium
29 of 245
Understanding
+4 | -1
Noise is
View answer and explanation
Correct option: C
Unwanted sound
Option C (Unwanted sound) is correct because noise is defined as any sound that is undesirable or disruptive.
30
Hard
30 of 245
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.
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 245 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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