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NEET • BIOLOGY • ENVIRONMENTAL ISSUES
Environmental issues practice · Medium
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Showing 1-30 of 116 questions
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Medium
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Understanding
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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.
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Medium
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Remembering
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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.
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Medium
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Analyzing
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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.
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Medium
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Remembering
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Which of the following is not used for disinfection of drinking water?
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Correct option: A
Phenyl
Option A (Phenyl) is correct because phenyl is an antiseptic and disinfectant used for surfaces, not for drinking water disinfection.
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Medium
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Understanding
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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.
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Medium
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Remembering
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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.
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Medium
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Remembering
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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
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Correct option: C
Activated sludge treatment
Option C (Activated sludge treatment) is correct because it involves recycling decomposer bacteria to enhance waste decomposition.
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Medium
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Remembering
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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.
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Remembering
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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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Medium
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Understanding
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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.
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Medium
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Remembering
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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.
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Medium
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Analyzing
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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.
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Medium
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Understanding
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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?
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Correct option: D
Both (1) and (3)
Option D (Both (1) and (3)) is correct because nutrient enrichment leads to algal blooms and eutrophication.
14
Medium
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Understanding
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Undesirable changes in soil profile, affecting its productivity is called
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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.
15
Medium
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Analyzing
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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.
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Medium
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Understanding
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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.
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Medium
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Remembering
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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.
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Medium
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Understanding
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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.
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Medium
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Understanding
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Study the following statements regarding Ecosave toilet and select the incorrect ones
View answer and explanation
Correct option: D
Enhance the need for chemical fertilisers
Option D (Enhance the need for chemical fertilisers) is correct because Ecosan toilets are designed to reduce the need for chemical fertilizers by recycling human excreta into natural fertilizers.
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Medium
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Understanding
+4 | -1
Catalytic converters are fitted into automobiles to reduce the emission of harmful gases. Catalytic converters changes unburnt hydrocarbons into
View answer and explanation
Correct option: A
Carbon dioxide and water
Option A (Carbon dioxide and water) is correct because catalytic converters oxidize unburnt hydrocarbons into carbon dioxide and water.
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Medium
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Understanding
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Desertification has become a major problem due to
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because decreased natural resources, increased urbanization, and increased population all contribute to desertification.
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Medium
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Remembering
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Three mile island and chernobyl disasters are associated with accidental leakage of
View answer and explanation
Correct option: A
Radioactive wastes
Option A (Radioactive wastes) is correct because both Three Mile Island and Chernobyl were nuclear disasters involving the release of radioactive materials.
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Medium
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Remembering
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What did Chernobyl, Three Mile Island, the Love Canal and Bhopal, India all have in common?
View answer and explanation
Correct option: A
They were all radioactive disasters
The correct answer is not listed among the options. Chernobyl, Three Mile Island, and Bhopal were all industrial disasters, but Chernobyl and Three Mile Island were nuclear accidents, Love Canal was a chemical waste disaster, and Bhopal was a gas leak disaster. Therefore, none of the provided options accurately describe what all four had in common.
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Medium
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Remembering
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BOD is concerned with
View answer and explanation
Correct option: C
Microbes and organic matter
Option C (Microbes and organic matter) is correct because BOD (Biochemical Oxygen Demand) measures the amount of oxygen consumed by microbes while decomposing organic matter in water.
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Medium
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Understanding
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Why CNG is considered as good fuel over diesel/petrol?
I. CNG burns most efficiently without leaving any unburnt remnant behind
II. CNG is cheaper than petrol or diesel
III. CNG cannot be siphoned off by thieves and adulterated like petrol or diesel
Which of the statements given above are correct?
I. CNG burns most efficiently without leaving any unburnt remnant behind
II. CNG is cheaper than petrol or diesel
III. CNG cannot be siphoned off by thieves and adulterated like petrol or diesel
Which of the statements given above are correct?
View answer and explanation
Correct option: D
I, II and III
Option D (I, II and III) is correct because all three statements accurately describe the advantages of CNG as a fuel.
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Medium
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Remembering
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Chipko movement was started in Garhwal, Himalayas in
View answer and explanation
Correct option: C
1974 by Shri Sunder Lal Bahuguna
The correct answer is C (1974 by Shri Sunder Lal Bahuguna) because the Chipko movement started in 1974 in Garhwal, Himalayas, led by Sunder Lal Bahuguna.
27
Medium
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Remembering
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Montreal protocol, which calls for appropriate action to protect the ozone layer from human activities was passed in the year
View answer and explanation
Correct option: B
1987
Option B (1987) is correct because the Montreal Protocol, which aims to protect the ozone layer, was passed in 1987.
28
Medium
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Remembering
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Peeling of ozone umbrella, which protects us from UV rays, is caused by
View answer and explanation
Correct option: A
CFCs
Option A (CFCs) is correct because Chlorofluorocarbons (CFCs) are the primary cause of ozone layer depletion, leading to a reduction in the ozone umbrella's ability to protect us from UV rays.
29
Medium
29 of 116
Remembering
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Gaseous pollutants can be controlled by
View answer and explanation
Correct option: D
Incineration
Option D (Incineration) is correct because incineration is a combustion process that can convert gaseous pollutants into less harmful substances.
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Medium
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Remembering
+4 | -1
Ecological sanitation is a sustainable system for handling human excreta, using dry composting toilets. Such ‘Ecosave’ toilets are working in
View answer and explanation
Correct option: C
Kerala and Sri Lanka
Option C (Kerala and Sri Lanka) is correct because ecological sanitation systems using dry composting toilets have been successfully implemented in Kerala, India, and Sri Lanka.
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 116 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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