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NEET • BIOLOGY • ENVIRONMENTAL ISSUES

Environmental issues practice · Medium

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Showing 31-60 of 116 questions

31 Medium

31 of 116

Understanding +4 | -1

One of the following acts as secondary pollutant

View answer and explanation

Correct option: D

\mathrm{HN}{\mathrm{O}_3}

Option D (

\mathrm{HN}{\mathrm{O}_3}

) is correct because nitric acid is formed in the atmosphere from primary pollutants like nitrogen oxides.

32 Medium

32 of 116

Remembering +4 | -1

Jhum cultivation refers to

View answer and explanation

Correct option: C

Tribal methods of shifting cultivation

Option C (Tribal methods of shifting cultivation) is correct because Jhum cultivation is a traditional agricultural practice used by some tribal communities involving clearing and cultivating land, then moving to a new area.

33 Medium

33 of 116

Remembering +4 | -1

Restoring a forest cover over an area where one existed earlier but was removed at some point of time in the past is called

View answer and explanation

Correct option: A

Reforestation

Option A (Reforestation) is correct because reforestation is the process of restoring forest cover in an area where it previously existed but was removed.

34 Medium

34 of 116

Remembering +4 | -1

\mathrm{S}{\mathrm{O}_2}

pollution is indicated by

View answer and explanation

Correct option: C

Usnea (lichens)

Option C (Usnea (lichens)) is correct because lichens, particularly Usnea, are highly sensitive to sulfur dioxide (SO2) pollution and their presence or absence indicates air quality.

35 Medium

35 of 116

Remembering +4 | -1

It is estimated that out of the total global warming, the relative contribution of

\mathrm{C}{\mathrm{O}_2}

\mathrm{C}{\mathrm{H}_4}

,CFCs and

{\mathrm{N}_2}\mathrm{O}

are found respectively as

View answer and explanation

Correct option: A

60%, 20%, 14% and 6%

Option A (60%, 20%, 14% and 6%) is correct because these percentages represent the approximate relative contributions of

CO_2

CH_4

, CFCs, and

N_2O

to global warming.

36 Medium

36 of 116

Remembering +4 | -1

Which of the following is non-biodegradable?

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Correct option: B

DDT

Option B (DDT) is correct because DDT is a persistent organic pollutant that does not readily break down in the environment, making it non-biodegradable.

37 Medium

37 of 116

Understanding +4 | -1

Consider the following statements about pollution
I. Pollution is an undesirable change in physical, chemical or biological characteristics of air, land, water or soil
II. The air act was amendid in 1987 to include noise as air pollutant
III. In order to control environmental pollution, the Government of India has passed the environment Protection Act, 1976 to protect and improve the quality of our environment
Which of the statements given above are correct?

View answer and explanation

Correct option: A

I and II

Option A (I and II) is correct because pollution is defined as undesirable changes and the Air Act was amended to include noise.

38 Medium

38 of 116

Understanding +4 | -1

Read the following statements carefully and select the correct ones
I. UV rays essential for the production as well as degradation of ozone gas
II. Ozone present in ionosphere acts as a shield absorbing UV radiation coming from the sun
III. One fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds and only half of the incoming solar radiation falls on the earth’s surface, heating it. Of this only a small portion is reflected back

View answer and explanation

Correct option: B

I and III

Option B (I and III) is correct. UV rays are involved in both the production and degradation of ozone, and the statement about solar radiation reflection and absorption is also accurate.

39 Medium

39 of 116

Remembering +4 | -1

The ultraviolet radiations in the stratosphere are absorbed by

View answer and explanation

Correct option: A

{\mathrm{O}_3}

Option A (

{\mathrm{O}_3}

) is correct because ozone (

O_3

) in the stratosphere absorbs the majority of the ultraviolet (UV) radiation from the sun, protecting life on Earth.

40 Medium

40 of 116

Understanding +4 | -1

Which of the following are the main harmful effects of deforestation? I. Increase in carbon dioxide concentration in atmosphere II. Loss of biodiversity due to habitat destruction III. Disturbance in hydrologic cycle IV. Desertification Which of the statements given above are correct?

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Correct option: D

I, II, III and IV

The correct answer is D (I, II, III and IV) because all the listed effects are harmful consequences of deforestation.

41 Medium

41 of 116

Understanding +4 | -1

The atmosphere around earth is warmed because

View answer and explanation

Correct option: B

Molecules in the atmosphere are warmed by radiation from earth and retain that heat

Option B (Molecules in the atmosphere are warmed by radiation from earth and retain that heat) is correct because greenhouse gases in the atmosphere absorb and re-emit infrared radiation from the Earth's surface, trapping heat and warming the planet.

42 Medium

42 of 116

Remembering +4 | -1

Which one of following is not an air pollutant?

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Correct option: B

phosphates

Option B (phosphates) is correct because phosphates are water pollutants, not air pollutants.

43 Medium

43 of 116

Remembering +4 | -1

What device is fitted to automobiles for reducing the emission of poisonous gases like

\mathrm{N}{\mathrm{O}_2}

and CO?

View answer and explanation

Correct option: A

Catalytic converters

Option A (Catalytic converters) is correct because catalytic converters are designed to reduce the emission of poisonous gases like nitrogen oxides and carbon monoxide from automobiles.

44 Medium

44 of 116

Understanding +4 | -1

High level radioactive waste can be managed in which of the following ways?

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Correct option: D

Dumping in sealed containers

Option D (Dumping in sealed containers) is correct because it is a safe and effective method for managing high-level radioactive waste.

45 Medium

45 of 116

Analyzing +4 | -1

Assertion: Through the use of catalytic
converters, unburnt hydrocarbons are changed
into carbon monoxide which in turn is changed
into nitrogen oxides and water.

Reason: Motor vehicles equipped with catalytic
converters should use leaded petrol to protect
the catalyst from degradation.

View answer and explanation

Correct option: D

If both Assertion and Reason are false

Option D (If both Assertion and Reason are false) is correct because catalytic converters change unburnt hydrocarbons into carbon dioxide and water, and leaded petrol damages the catalyst.

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46 Medium

46 of 116

Understanding +4 | -1

Carbon dioxide is called green house gas because it is

View answer and explanation

Correct option: C

Transparent to sunlight but traps heat

Option C (Transparent to sunlight but traps heat) is correct because carbon dioxide allows sunlight to pass through but absorbs and re-emits infrared radiation (heat).

47 Medium

47 of 116

Remembering +4 | -1

Which one of the following pesticides is banned now-a-days?

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Correct option: A

DDT

Option A (DDT) is correct because DDT is a persistent pesticide that has been banned in many countries due to its harmful effects on the environment and human health.

48 Medium

48 of 116

Understanding +4 | -1

Addition of phosphate and nitrates/fertiliser into water and that water ultimately draining into lake firstly affects

View answer and explanation

Correct option: A

Growth of aquatic organisms in lake

Option A is correct because the initial effect of increased nutrients (phosphates and nitrates) is the stimulation of growth of aquatic organisms, particularly algae.

49 Medium

49 of 116

Understanding +4 | -1

DDT residues are rapidly passed through food chain causing biomagnifications because DDT is

View answer and explanation

Correct option: A

Lipo soluble

Option A (Lipo soluble) is correct because DDT is fat-soluble (liposoluble), which allows it to accumulate in the fatty tissues of organisms and biomagnify through the food chain.

50 Medium

50 of 116

Remembering +4 | -1

Amrita Devi Bishnoi wildlife protection award is for the individuals or communities from rural areas that have extraordinary courage in

View answer and explanation

Correct option: D

Protecting wildlife

Option D (Protecting wildlife) is the correct answer because the Amrita Devi Bishnoi award recognizes courage in wildlife conservation.

51 Medium

51 of 116

Remembering +4 | -1

In India, the Air Prevention and Control of pollution Act came into force in …A…, but was amended in …B… to include …C… as an air pollutant
Complete the given statement by choosing appropriate option for A-C

View answer and explanation

Correct option: B

A-1981, B-1987, C-noise

Option B (A-1981, B-1987, C-noise) is correct because the Air Prevention and Control of Pollution Act came into force in 1981 and was amended in 1987 to include noise as an air pollutant.

52 Medium

52 of 116

Understanding +4 | -1

Which of the following are correctly matched?
I. Arsenic poisoning - Black foot disease
II. Secondary effluent
treatment - Biological process
III. Pyrolysis - Solid soil waste disposal
IV. Tubifex - Water pollution indicator
V. Biomagnification - Degradable pollutants

View answer and explanation

Correct option: D

I,II,III and IV

Option D (I,II,III and IV) is correct because Arsenic poisoning causes black foot disease, Secondary effluent treatment is a biological process, Pyrolysis is a method for solid waste disposal, and Tubifex worms are indicators of water pollution.

53 Medium

53 of 116

Understanding +4 | -1

Which of the following is absent in polluted water?

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Correct option: C

Larva of stone fly

Option C (Larva of stone fly) is correct because stonefly larvae are highly sensitive to pollution and are typically absent in polluted water due to their need for high oxygen levels.

54 Medium

54 of 116

Analyzing +4 | -1

Assertion : Global warming (Green house
effect) occurs due to penetrability of low
wavelength radiation through ozone layer.

Reason : CFC is green house gas which results
in impenetrability of long wave length radiation
through

C{O_2}

of the atmosphere.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and
Reason is the correct explanation of Assertion

Option D (If both Assertion and Reason are false) is correct because global warming is due to the trapping of long-wavelength radiation, and CFCs do not cause impenetrability of long-wavelength radiation through CO2.

55 Medium

55 of 116

Analyzing +4 | -1

A: CNG burns more efficiently than diesel.

R: CNG is cheaper than petrol or diesel.

View answer and explanation

Correct option: B

Assertion & Reason are true but the reason is not the correct explanation of the assertion

Option B (Assertion & Reason are true but the reason is not the correct explanation of the assertion) is correct because CNG burns more efficiently, and CNG is cheaper, but the cheapness doesn't cause the efficiency.

56 Medium

56 of 116

Understanding +4 | -1

The possible beneficial aspect of grazing animals is the

View answer and explanation

Correct option: D

Addition of their excreta into the soil

Option D (Addition of their excreta into the soil) is correct because animal excreta acts as a natural fertilizer, enriching the soil.

57 Medium

57 of 116

Remembering +4 | -1

Which of the following methods are useful for solid waste disposal?
I. Open burning
II. Sanitary landfills
III. Rag-pickers and kabadiwallahs
IV. Natural breakdown
V. Recycling
VI. Incineration
Choose the correct option

View answer and explanation

Correct option: D

I, II, III, IV, V and VI

Option D (I, II, III, IV, V and VI) is correct because all listed methods (open burning, sanitary landfills, rag-pickers, natural breakdown, recycling, and incineration) are used for solid waste disposal, although some are more environmentally sound than others.

58 Medium

58 of 116

Remembering +4 | -1

Without greenhouse effect the average temperature at surface of earth would have been:-

View answer and explanation

Correct option: A

- 18^\circ \,C

Option A (-18° C) is correct because without the greenhouse effect, the Earth's average surface temperature would be significantly lower, estimated to be around -18°C.

59 Medium

59 of 116

Understanding +4 | -1

Given below a set of health problems
I. lack of sleep
II. high blood pressure
III. stress
IV. complete or partial hearing
V. anxiety
Which of the health problems given above are caused by noise pollution?

View answer and explanation

Correct option: D

I, II, III, IV and V

Option D (I, II, III, IV and V) is correct because noise pollution can cause all the listed health problems.

60 Medium

60 of 116

Remembering +4 | -1

Which one of the following statement is wrong in case Bhopal gas tragedy?

View answer and explanation

Correct option: B

Radioactive fall out engulfed Bhopal

Option B (Radioactive fall out engulfed Bhopal) is correct because the Bhopal gas tragedy involved methyl isocyanate, not radioactive materials.

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