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NEET • BIOLOGY • ENVIRONMENTAL ISSUES
Environmental issues practice · Easy
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61
Easy
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Understanding
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Initially BOD of primary effluent in aeration tank increases in STPs because
View answer and explanation
Correct option: A
Vigorous growth of useful aerobic microbes occur
Option A (Vigorous growth of useful aerobic microbes occur) is correct because the initial increase in BOD in the aeration tank of STPs is due to the rapid growth of aerobic microbes consuming the organic matter.
62
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Remembering
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Algal blooms imparts a distinct colour to water due to
View answer and explanation
Correct option: A
Their pigments
Option A is correct because algal blooms impart color to water due to the presence of various pigments within the algal cells.
63
Easy
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Understanding
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Which statement represents the harmful effect of depletion of earth’s ozone layer?
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Correct option: C
Increased amount of ultraviolet radiation will reach earth’s surface
Option C (Increased amount of ultraviolet radiation will reach earth’s surface) is correct because ozone layer depletion allows more harmful UV radiation to penetrate the atmosphere and reach the Earth's surface.
64
Easy
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Understanding
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Examples of regional pollution are
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because both acid rain and smog are examples of pollution that affects a wide geographical area.
65
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Remembering
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Chipko movement (1974) is the world’s known eco development programme, started by Sunder Lal Bahuguna in Tehri Garhwal (Uttarakhand). It is associated with
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Correct option: A
Plant conservation
Option A (Plant conservation) is correct because the Chipko movement was primarily focused on protecting trees and forests.
66
Easy
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Understanding
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Loss of forest, urbanization, increasing pollution are all due to
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Correct option: C
Population explosion
The correct answer is C (Population explosion) because a rapidly growing population puts increased pressure on resources, leading to deforestation, urbanization, and pollution.
67
Easy
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Remembering
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The gradual continuous increase in average temperature of surface of the earth as a result of increase in concentration of and CFCs is termed as
View answer and explanation
Correct option: A
Global warming
Option A (Global warming) is correct because the gradual increase in Earth's average temperature due to increased and CFCs is defined as global warming.
68
Easy
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Understanding
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Consider the following statements
I. Algal blooms are formed by free floating algae
II. Algal bloom causes fish mortality and deterioration of water quality
III. Water hyacinth, the world’s most problematic aquatic weed is also called ‘Terror of Bengal’
Which of the statements given above are correct about algal blooms?
I. Algal blooms are formed by free floating algae
II. Algal bloom causes fish mortality and deterioration of water quality
III. Water hyacinth, the world’s most problematic aquatic weed is also called ‘Terror of Bengal’
Which of the statements given above are correct about algal blooms?
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 algal blooms and the invasive species, water hyacinth.
69
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Remembering
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Which of the following compounds are well known for biological magnification?
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Correct option: C
Both (1) and (2)
Option C is correct because both DDT and mercury are well-known for their ability to undergo biological magnification, increasing in concentration as they move up the food chain.
70
Easy
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Remembering
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Increase the atmospheric temperature due to is called
View answer and explanation
Correct option: B
Green house effect
Option B (Green house effect) is correct because the increase in atmospheric temperature due to is the greenhouse effect.
71
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Remembering
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Term used for accumulation of non-degradable pollutants in higher trophic level is
View answer and explanation
Correct option: A
Bio magnification
Option A (Bio magnification) is correct because biomagnification is the process where non-degradable pollutants accumulate in increasing concentrations at higher trophic levels.
72
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Understanding
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In electrostatic precipitator, electrode wires are provided with an electric current of several thousand volts, which produces a corona that release …A…
These electron attach to dust particle and given them a …B… charge within a very small fraction of a second. Here A and B refers to
These electron attach to dust particle and given them a …B… charge within a very small fraction of a second. Here A and B refers to
View answer and explanation
Correct option: C
A-electron; B-negative
Option C (A-electron; B-negative) is correct because electrostatic precipitators use electrons to negatively charge dust particles.
73
Easy
73 of 82
Remembering
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One of the main reasons of soil erosion in India is
View answer and explanation
Correct option: B
Deforestation
The correct answer is B (Deforestation) because removing trees leaves the soil exposed and vulnerable to erosion by wind and water.
74
Easy
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Remembering
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Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste water into natural surface water, is
View answer and explanation
Correct option: B
< 10 ppm
Option B (< 10 ppm) is correct because the CPCB prescribes a BOD limit of less than 10 ppm for discharge into natural surface water.
75
Easy
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Analyzing
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Assertion: Inhabitants close to very busy airports are likely to experience health hazards.
Reason: Sound level of jet aeroplanes usually exceeds 160 dB.
Reason: Sound level of jet aeroplanes usually exceeds 160 dB.
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 is correct because inhabitants near busy airports are indeed prone to health hazards due to noise pollution, and the sound level of jet aeroplanes often exceeds 160 dB, contributing to these hazards.
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76
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Understanding
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Consider the following statements
I. Noise causes psychological disorder in humans
II. Noise causes physiological disorder in humans
III. Noise measurable unit is dB but some times it is measured in Dobson unit
IV. 150 dB is tolerate for human
Which of the above statements are true?
I. Noise causes psychological disorder in humans
II. Noise causes physiological disorder in humans
III. Noise measurable unit is dB but some times it is measured in Dobson unit
IV. 150 dB is tolerate for human
Which of the above statements are true?
View answer and explanation
Correct option: B
I and II
Option B (I and II) is correct because noise pollution can cause both psychological and physiological disorders in humans. The other statements are incorrect.
77
Easy
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Remembering
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Green-house effect refers to
View answer and explanation
Correct option: D
Warming of earth
Option D (Warming of earth) is correct because the greenhouse effect results in the warming of the Earth's surface.
78
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Analyzing
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Which one is odd w.r.t primary pollutant?
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Correct option: C
Option C () is correct because it is a secondary pollutant, formed from primary pollutants, while the others are directly emitted.
79
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Understanding
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Ozone depletion in stratosphere shall result in
View answer and explanation
Correct option: D
Increased incidence of skin cancer
Option D (Increased incidence of skin cancer) is correct because ozone depletion in the stratosphere leads to higher levels of UV radiation reaching the Earth's surface, which increases the risk of skin cancer.
80
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Remembering
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Of the following four metropolitan Indian cities, where polluted air hangs above like a cloud is
View answer and explanation
Correct option: B
Delhi
Option B (Delhi) is correct because Delhi is known for its high levels of air pollution, often resulting in smog that hangs like a cloud.
81
Easy
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Remembering
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Identify the correctly matched pair.
View answer and explanation
Correct option: B
Kyoto protocol - Climate change
Option B (Kyoto protocol - Climate change) is correct because the Kyoto Protocol is an international agreement linked to the United Nations Framework Convention on Climate Change.
82
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Remembering
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In almost all Indian metropolitan cities like Delhi, the major atmospheric pollutant (s) is /are
View answer and explanation
Correct option: C
Carbon dioxide and carbon monoxide
Option C (Carbon dioxide and carbon monoxide) is correct because in many Indian metropolitan cities, the major atmospheric pollutants are carbon dioxide and carbon monoxide, primarily from vehicle emissions and industrial activities.
Revision notes and key takeaways
Review ENVIRONMENTAL ISSUES in your textbook or class notes, then use this set to check your understanding.
Showing 61-82 of 82 questions