MCQs For NCERT Class 12 Biology Chapter 16 Environmental Issues

Please refer to the MCQ Questions for Class 12 Biology Chapter 16 Environmental Issues with Answers. The following Environmental Issues Class 12 Biology MCQ Questions has been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Biology with Answers for all chapters in your NCERT Class 12 Biology book.

Environmental Issues Class 12 MCQ Questions with Answers

See below Environmental Issues Class 12 Biology MCQ Questions, solve the questions and compare your answers with the solutions provided below. 

Question. Which is the cause of damage to relative biological effectiveness?
(a) High temperature
(b) Pollution
(c) Radiation
(d) Low temperature

Question. Which of the following is a secondary pollutant?
(a) PAN
(b) Aerosol
(c) CO
(d) CO₂ 

Question. Which of the following is a secondary pollutant?
(a) CO
(b) CO₂
(c) SO₂
(d) O₃ 

Question. A renewable exhaustible natural resource is
(a) coal
(b) petroleum
(c) minerals
(d) forest. 

Question. Petroleum is a
(a) synthetic product
(b) renewable resource
(c) nonrenewable resource
(d) inconvenient resource. 

Question. Which one of the following statements is not valid for aerosols?
(a) They alter rainfall and monsoon patterns.
(b) They cause increased agricultural productivity.
(c) They have negative impact on agricultural land.
(d) They are harmful to human health

Question. Acid rain is caused by increase in the atmospheric concentration of
(a) CO₂ and CO
(b) O₃ and dust
(c) SO₂ and NO₂
(d) SO₃ and CO. 

Question. Which of the following are most suitable indicators of SO₂ pollution in the environment?
(a) Algae
(b) Fungi
(c) Lichens
(d) Conifers 

Question. A location with luxuriant growth of lichens on the trees indicates that the
(a) trees are very healthy
(b) trees are heavily infested
(c) location is highly polluted
(d) location is not polluted. 

Question. Minerals and metals are
(a) biodegradable resources
(b) renewable
(c) non-renewable
(d) renewable and non-renewable resources.

Question. Domestic waste constitutes
(a) non-biodegradable pollution
(b) biodegradable pollution
(c) effluents
(d) air pollution.

Question. Which one of the following is not correct with regard to the harmful effects of particulate matter ofthe size 2.5 micrometer or less?
(a) It can cause respiratory problems.
(b) It can directly enter into our circulatory system.
(c) It can cause inflammation and damage to the lungs.
(d) It can be inhaled into the lungs.

Question. dB is a standard abbreviation used for the quantitative expression of
(a) the density of bacteria in a medium
(b) a particular pollutant
(c) the dominant Bacillus in a culture
(d) a certain pesticide. 

Question. According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?
(a) 1.0 or less
(b) 5.2 – 2.5
(c) 2.5 or less
(d) 1.5 or less 

Question. In a coal fired power plant electrostatic precipitators are installed to control emission of
(a) NOX
(b) SPM
(c) CO
(d) SO₂. 

Question. A scrubber in the exhaust of a chemical industrial plant removes
(a) gases like sulphur dioxide
(b) particulate matter of the size 5 micrometer or above
(c) gases like ozone and methane
(d) particulate matter of the size 2.5 micrometer or less. 

Question. The Air Prevention and Control of Pollution Act came into force in
(a) 1985
(b) 1990
(c) 1975
(d) 1981

Question. Fluoride pollution mainly affects
(a) brain
(b) heart
(c) teeth
(d) kidney. 

Question. What is the intensity of sound in normal conversation?
(a) 10-20 dB
(b) 30-60 dB
(c) 70-90 dB
(d) 120-150 dB

Question. Which of the following is pollution related disorder?
(a) Silicosis
(b) Pneumonicosis
(c) Fluorosis
(d) Leprosis

Question. Which of the following is the use of lichens in case of pollution?
(a) They promote pollution.
(b) Lichens are not related with pollution.
(c) They treat the polluted water.
(d) They act as bioindicators of pollutions.

Question. Photochemical smog pollution does not contain
(a) PAN (peroxyacyl nitrate)
(b) ozone
(c) nitrogen dioxide
(d) carbon dioxide. 

Question. Lead concentration in blood is considered alarming if it is
(a) 20 mg / 100 mL
(b) 30 mg / 100 mL
(c) 4 – 6 mg / 100 mL
(d) 10 mg / 100 mL.

Question. How carbon monoxide, emitted by automobiles, prevents transport of oxygen in the body tissues?
(a) By forming a stable compound with haemoglobin
(b) By obstructing the reaction of oxygen with haemoglobin
(c) By changing oxygen into carbon dioxide
(d) By destroying the haemoglobin 

Question. The Taj Mahal is threatened due to the effect of
(a) oxygen
(b) hydrogen
(c) chlorine
(d) sulphur dioxide.

Question. The toxic effect of carbon monoxide is due to its greater affinity for haemoglobin as compared to oxygen approximately by
(a) 200 times
(b) 1000 times
(c) 2 times
(d) 20 times. 

Question. Sounds above what level are considered hazardous noise pollution?
(a) Above 80 dB
(b) Above 30 dB
(c) Above 150 dB
(d) Above 120 dB 

Question. The supersonic jets cause pollution by the thinning of
(a) O₂ layer
(b) O₃ layer
(c) CO₂ layer
(d) SO₂ layer. 

Question. Carbon monoxide is a pollutant because
(a) reacts with haemoglobin
(b) makes nervous system inactive
(c) it reacts with O₂
(d) it inhibits glycolysis.

Question. Ultraviolet radiations from sunlight causes a reaction that produces
(a) fluorides
(b) carbon monoxide
(c) sulphur dioxide
(d) ozone. 

Question. Acid rain is due to increase in atmospheric concentration of
(a) ozone and dust
(b) CO₂ and CO
(c) SO₃ and CO
(d) SO₂ and NO₂.

Question. Major aerosol pollutant in jet plane emission is
(a) sulphur dioxide
(b) carbon monoxide
(c) methane
(d) fluorocarbon

Question. Acid rains are produced by
(a) excess NO₂ and SO₂ from burning fossil fuels
(b) excess production of NH₃ by industry and coalgas 
(c) excess release of carbon monoxide by incomplete combustion
(d) excess formation of CO₂ by combustion and animal respiration. 

Question. Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from
(a) domestic sewage
(b) dairy industry
(c) petroleum industry
(d) sugar industry.

Question. Most hazardous metal pollutant of automobile exhausts is
(a) mercury
(b) cadmium
(c) lead
(d) copper. 

Question. Which one is not a pollutant normally?
(a) Hydrocarbon
(b) Carbon dioxide
(c) Carbon monoxide
(d) Sulphur dioxide

Question. A lake which is rich in organic waste may result in
(a) increased population of aquatic organisms due to minerals
(b) drying of the lake due to algal bloom
(c) increased population of fish due to lots of nutrients
(d) mortality of fish due to lack of oxygen.

Question. Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of
(a) essential minerals
(b) oxygen
(c) food
(d) light.

Question. Increase in concentration of the toxicant at successive trophic levels is known as
(a) biotransformation
(b) biogeochemical cycling
(c) biomagnification
(d) biodeterioration. 

Question. High value of BOD (Biochemical Oxygen Demand) indicates that
(a) water is less polluted
(b) consumption of organic matter in the water is higher by the microbes
(c) water is pure
(d) water is highly polluted.

Question. Rachel Carson’s famous book “Silent Spring” is related to
(a) population explosion
(b) ecosystem management
(c) pesticide pollution
(d) noise pollution. 

Question. The highest DDT concentration in aquatic food chain shall occur in
(a) phytoplankton
(b) seagull
(c) crab
(d) eel. 

Question. A river with an inflow of domestic sewage rich in organic waste may result in
(a) an increased production of fish due to biodegradable nutrients
(b) death of fish due to lack of oxygen
(c) drying of the river very soon due to algal bloom
(d) increased population of aquatic food web organisms.

Question. Eutrophication is often seen in
(a) deserts
(b) fresh water lakes
(c) ocean
(d) mountains.

Question. When domestic sewage mixes with river water
(a) small animals like rats will die after drinking river water
(b) the increased microbial activity releases micronutrients such as iron
(c) the increased microbial activity uses up dissolved oxygen
(d) the river water is still suitable for drinking as impurities are only about 0.1%.

Question. Biochemical oxygen demand (BOD) in a river water
(a) has no relationship with concentration of oxygen in the water
(b) gives a measure of Salmonella in the water
(c) increases when sewage gets mixed with river water
(d) remains unchanged when algal bloom occurs. 

Question. DDT residues are rapidly passed through food chain causing biomagnification because DDT is
(a) moderately toxic
(b) non-toxic to aquatic animals
(c) water soluble
(d) lipo soluble.

Question. In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged n ascending order?
(a) SE < PE < S < DE
(b) PE < S < SE < DE
(c) S < DE < PE < SE
(d) SE < S < PE < DE

Question. In an area where DDT had been used extensively, the population of birds declined significantly because
(a) birds stopped laying eggs
(b) earthworms in the area got eradicated
(c) cobras were feeding exclusively on birds
(d) many of the birds eggs laid, did not hatch.

Question. Which one of the following is not a bioindicator of water pollution?
(a) Blood-worms
(b) Stone flies
(c) Sewage fungus
(d) Sludge-worms