CBSE Class 12 Biology Environmental Issues MCQs

Refer to CBSE Class 12 Biology Environmental Issues MCQs provided below. CBSE Class 12 Biology MCQs with answers available in Pdf for free download. The MCQ Questions for Class 12 Biology with answers have been prepared as per the latest syllabus, CBSE books and examination pattern suggested in Class 12 by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 16 Environmental Issues are an important part of exams for Class 12 Biology and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 12 Biology and also download more latest study material for all subjects

MCQ for Class 12 Biology Chapter 16 Environmental Issues

Class 12 Biology students should refer to the following multiple-choice questions with answers for Chapter 16 Environmental Issues in Class 12. These MCQ questions with answers for Class 12 Biology will come in exams and help you to score good marks

Chapter 16 Environmental Issues MCQ Questions Class 12 Biology with Answers

Question : Pollution causes undesirable changes in which the following characteristics of air, water, land or soil ?

a) Physical  
b) Chemical
c) Biological
d) All of these

Answer : D

Question : To improve the quality of environment (air, water and soil) the Govt. of India passed the ‘Environment (Protection) Act’ in year

a) 1981
b) 1986
c) 1987
d) 1974

Answer : B 

Question : Which one of the following is a most efficient device to eliminate particulate matters from the industrial emissions ?

a) Cyclonic separators
b) Trajectory separators
c) Incineration
d) Electrostatic precipitator

Answer : D

Question : The scrubber is used mainly to remove which of the following gas/es from the exhaust after spraying water/ lime ?

a) CO2          
b) SO2
c) O2 and N2 
d) CO and CO2

Answer : B 

Question : Which of the two expensive metals are used as catalysts by catalytic converters and are fitted into automobiles for reducing emission of poisonous gases ?

a) Platinum - palladium, rhodium
b) Cadmium, rhodium
c) Copper, cadmium
d) Lead, mercury

Answer : A 

Question : Which of the following level of sound may damage ear drum and can impair the hearing ability permanently ?

a) 80 dB  
b) 100 dB
c) 120 dB
d) 150 dB

Answer : D

Question : Euro II norms stipulate that sulphur be controlled at _______ ppm in diesel and _______ ppm in petrol.

a) 350; 150
b) 150; 350
c) 350; 250
d) 150; 250

Answer : A 

Question : All automobiles and fuel -petrol and diesel were to have met the Euro III emission specifications in some cities from 1 April 2005 and have to meet the Euro-IV norms by

a) 1 April 2008
b) 1 April 2009
c) 1 April 2010
d) 1 April 2012

Answer : C 

Question : Which of the following minimum percentage of impurities by domestic sewage make the water unfit for human use ?

a) 1  
b) 5
c) 0.1
d) 0.5

Answer : C

Question : The amount of organic matter in sewage water can be estimated by

a) measuring oxygen demand
b) weight of micro-organisms
c) salt analysis
d) calorimetery

Answer : A

Question :  Non-biodegradable pollutants are created by

a) humans

b) natural disasters

c) excessive use of resources

d) nature

Answer :  humans

Question :  According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of diameter

a) 2.50 micrometers

b) 5.00 micrometers

c) 10.00 micrometers

d) 7.5 micrometers

Answer :  2.50 micrometers

Question :  The material generally used for sound proofing of rooms like a recording studio and auditorium, etc. is:

a) styro foam

b) wood

c) coir

d) cotton

Answer :  styro foam

Question :  Compressed Natural Gas (CNG) is

a) methane

b) ethane

c) butane

d) propane

Answer :  methane

Question :  World’s most problematic aquatic weed is

a) Eichornia

b) Wolffia

c) Azolla

d) Trapa

Answer :  Eichornia

Question :  Which of the following causes biomagnification?

a) Both

b) Mercury

c) DDT

d) None of these

Answer :  Both

Question :  The expanded form of DDT is

a) dichloro diphenyl trichloroethane

b) dichloro diethyl trichloroethane

c) dichloro dipyrydyl trichloroethane

d) dichloro diphenyl tetrachloroacetate

Answer :  dichloro diphenyl trichloroethane

Question :  Which of the following material takes the longest time for biodegradation?

a) Bone

b) Jute

c) Paper

d) Cotton

Answer :  Bone

Question :  Which one of the following is a wrong statement?

a) Ozone in upper part of atmosphere is harmful to animals

b) Ozone in upper part of atmosphere is harmful to animals

c) Eutrophication is a natural phenomenon in freshwater bodies

d) Eutrophication is a natural phenomenon in freshwater bodies

Answer :  Ozone in upper part of atmosphere is harmful to animals

Question :  In an area where DDT had been used extensively, the population of birds declined significantly because

a) Many of the birds eggs laid, did not hatch,

b) Birds stopped laying eggs

c) Earthworms in the area got eradicated

d) Earthworms in the area got eradicated

Answer :  Many of the birds eggs laid, did not hatch,

Question : Lichens indicate SO2 pollution because they 
a) show association between algae and fungi
b) grow faster than others
c) are sensitive to SO2 
d) flourish in SO2 rich environment 
Answer: C
 
Question : Acid rains are produced by 
a) excess NO2 and SO2 from burning fossil fuels
b) excess production of NH3 by industry and coal gas
c) excess release of carbon monoxide by incomplete combustion
d) excess formation of CO2 by combustion and animal respiration 
Answer: A
 
Question : Green-house effect is warming due to 
a) infra-red rays reaching earth
b) moisture layer in atmosphere
c) increase in temperature due to increase in carbon dioxide concentration of atmosphere
d) ozone layer of atmosphere 
Answer: C
 
Question : Major aerosol pollutant in jet plane emission is 
a) sulphur dioxide
b) carbon monoxide
c) methane
d) chlorofluoro-carbons 
Answer: D
 
Question : Gas released during Bhopal tragedy was 
a) methyl isocyanate
b) potassium isothiocyanate
c) sodium isothiocyanate
d) ethyl isothiocyanate 
Answer: A
 
Question : Domestic waste constitutes 
a) non-biodegradable pollution
b) biodegradable pollution
c) effluents
d) air pollution 
Answer: B
 
Question : Which one is not a pollutant normally? 
a) Hydrocarbons
b) Carbon dioxide
c) Carbon monoxide
d) Sulphur dioxide 
Answer: B
 
Question : Most hazardous metal pollutant of automobile exhausts is 
a) mercury
b) cadmium
c) lead
d) copper 
Answer: C
 
Question : Ultraviolet radiations from sunlight cause a reaction which produces 
a) O3
b) SO2
c) CO
d) CH4 
Answer: A
 
Question : Drawback of DDT as pesticide is 
a) it becomes ineffective after some time
b) it is less effective than others
c) it is not easily/rapidly degraded in nature
d) its high cost 
Answer: C
 
Question : Highest DDT deposition shall occur in 
a) phytoplankton
b) sea gull/birds
c) crab
d) eel 
Answer: B
 
Question : Fish die in water bodies polluted by sewage due to 
a) pathogens
b) clogging of gills by silt
c) reduction in oxygen
d) fuel smell 
Answer: C
 
Question : Disease caused by eating fish found in water contaminated with industrial waste having mercury is 
a) Minamata disease
b) Blight’s disease
c) Hashimoto’s disease
d) Osteosclerosis 
Answer: A
 
Question : Sound becomes hazardous noise pollution at level
a) above 30 dB
b) above 80 dB
c) above 100 dB
d) above 120 dB 
Answer: B
 
Question : Atmosphere of big/metropolitan cities is polluted most by 
a) automobile exhausts
b) pesticide residue
c) household waste
d) radioactive fall-out 
Answer: A
 
Question : When huge amount of sewage is dumped into a river, its BOD will
a) increase
b) decrease
c) sharply decrease
d) remain unchanged 
Answer: A
 
Question : In Minamata Bay of Japan, the animals which remained free from Minamata disease, are 
a) pigs
b) rabbits
c) dogs
d) cats 
Answer: B
 
Question : The Taj Mahal is threatened due to the effect of 
a) oxygen
b) hydrogen
c) chlorine
d) sulphur dioxide 
Answer: D
 
Question : Sewage drained into water bodies kill fishes because 
a) excessive carbon dioxide is added to water
b) it gives off a bad smell
c) it removes the food eaten by fish
d) it increases competition with fishes for dissolved oxygen 
Answer: D
 
Question : The major contributor of green-house gases to the atmosphere is 
a) Russia
b) USA
c) Germany
d) Brazil 
Answer: B
 
Question : The worst environmental hazards were created by accidents in nuclear power plant and MIC gas tragedy respectively in
a) Russia in 1990 and Bhopal in 1986
b) Ukrain in 1988 and USA in 1984
c) Bhopal in 1984 and Russia in 1990
d) Ukrain in 1986 and Bhopal in 1984 
Answer: D
 
Question : If the forest cover is reduced to half, what is most likely to happen on a long term basis?
a) Tribals living in these areas will starve to death
b) Cattle in these and adjoining areas will die due to lack of fodder
c) Large areas will become deserts 
d) Crop breeding programmes will suffer due to a reduced availability of variety of germplasm 
Answer: C
 
Question : The most common indicator organism which represents polluted water is 
a) Escherichia coli
b) Salmonella typhi
c) Vibrio cholerae
d) Entamoeba histolytica 
Answer: A
 
Question : Phosphate pollution is mainly caused by
a) phosphate rock only [1997]
b) agricultural fertilizers only
c) sewage and phosphate rocks
d) sewage and agricultural fertilizers 
Answer: D
 
Question : The CO2 content by volume, in the atmospheric air is about 
a) 0.0314%
b) 0.34%
c) 3.34%
d) 4% 
Answer: A
 
Question : Formation of ozone hole is maximum over
a) India
b) Antarctica 
c) Europe
d) Africa 
Answer: B
 
Question : In coming years, skin related disorders will be more common due to 
a) air pollution
b) use of detergents
c) water pollution
d) depletion of ozone layer 
Answer: D
 
Question : Which one of the following organism is used as indicator of water quality ? 
a) Beggiatoa
b) Chlorella
c) Azospirillum
d) Escherichia 
Answer: D
 
Question : Which important green-house gas, other than methane, is being produced from the agricultural fields? 
a) Arsine
b) Sulphur dioxide
c) Ammonia
d) Nitrous oxide 
Answer: D
 
Question : The supersonic jets cause pollution by the thinning of 
a) CO2 layer
b) SO2 layer
c) O2 layer
d) O3 layer 
Answer: D
 
Question : Warm ocean surge of the peru current recurring every 5 to 8 year or so in the East Pacific of South America is widely known as 
a) Magnox
b) Gull stream
c) El Nino
d) Aye aye 
Answer: C
 
Question : Carbon monoxide is a pollutant because
a) it reacts with O2
b) it inhibits glycolysis
c) it reacts with haemoglobin
d) it makes nervous system inactive 
Answer: C
 
Question : If there was no CO2 in the earth’s atmosphere the temperature of earth’s surface would be
a) same as present 
b) less than the present
c) higher than the present
d) dependent on the amount of oxygen in the atmosphere  
Answer: B
 
Question : 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 
a) cyclic treatment
b) primary treatment
c) activated sludge treatment
d) tertiary treatment 
Answer: C
 
Question : Which of the following is the use of lichens in case of pollution? 
a) Lichens are not related with pollution
b) They act as bioindicators of pollution
c) They treat the polluted water
d) They promote pollution  
Answer: B
 
Question : Which of the following is a secondary pollutant ? 
a) Aerosol
b) CO
c) PAN
d) CO2 
Answer: C
 
Question : Green-house effect refers to 
a) production of cereals
b) cooling of earth
c) trapping of UV rays
d) warming of earth 
Answer: D
 
Question : In 1984, Bhopal gas tragedy was caused due to the leakage of 
a) potassium isocyanate
b) sodium monoxide
c) sodium thiocyanate
d) methyl isocyanate 
Answer: D
 
Question : Which of the following is pollution related disorder ? 
a) Fluorosis
b) Leprosy
c) Pneumonicosis
d) Silicosis 
Answer: A
 
Question : Relative Biological Effectiveness [RBE] usually refers to the damages caused by 
a) low temperature
b) high temperature
c) radiation
d) pollution 
Answer: C
 
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 
Answer: B
 
Question : What is BOD? 
a) The amount of O2 utilized by organisms in water
b) The amount of O2 utilized by microorganisms for decomposition
c) The total amount of O2 present in water
d) All of the above 
Answer: B
 
Question : Which of the following is absent in polluted water ? 
a) Hydrilla
b) Water hyacinth
c) Larva of stone fly
d) Blue-green algae 
Answer: C
 
Question : Fluoride pollution mainly affects 
a) teeth
b) kidney
c) brain
d) heart 
Answer: A
 
Question : If by radiation all nitrogenase enzymes are inactivated, then there will be no 
a) fixation of nitrogen in legumes
b) fixation of atmospheric nitrogen
c) conversion from nitrate to nitrite in legumes
d) conversion from ammonium to nitrate in soil 
Answer: A
 
Question : Lead concentration in blood is considered alarming if it is 
a) 20mg/100mL
b) 30mg/100mL
c) 4-6mg/100mL
d) 10mg/100mL 
Answer: B
 
Question : In 1984, the Bhopal gas tragedy took place because methyl isocyanate 
a) reacted with DDT
b) reacted with ammonia
c) reacted with CO2
d) reacted with water 
Answer: D
 
Question : Prolonged liberal irrigation of agricultural fields is likely to create the problem of 
a) acidity
b) aridity
c) metal toxicity 
d) salinity 
Answer: D
 
Question : Which of the following is not used for disinfection of drinking water? 
a) Phenyl
b) Chloramine
c) Chlorine
d) Ozone 
Answer: A
 
Question : Which one of the following pair is mismatched? 
a) Biomass burning — Release of CO2
b) Fossil fuel burning — Release of CO2
c) Nuclear power — Radioactive wastes
d) Solar energy — Green-house effect  
Answer: D

Question : Full form of B.O.D. is

a) Biological organism death
b) Biotic oxygen demand
c) Biochemical oxygen demand
d) Biological organisation day

Answer : C


Question : In B.O.D. test oxygen plays an important role to

a) destroy inorganic matter
b) destroy pollution
c) destroy waste organic matter
d) none of these

Answer : C

Question : Presence of large amount of nutrients in water also cause excess growth of planktonic (free-floating) algae, called ___________.

a) biomagnification
b) eutrophication
c) algal bloom
d) biofortification

Answer : C

Question : Which of the following species of plant is considered as the world’s most problematic aquatic weed ?

a) Lantana
b) Eichhornia
c) Parthenium (carrot grass)
d) Brown algae

Answer : C

Question : The waste water from Industries may contain toxic heavy metals having density of more than

a) 5 g / cm3
b) 10 g /cm3
c) 2 g /cm3
d) 15 g /cm3

Answer : B


Question : Concentration of DDT for first tropic level (phytoplanktons) and top trophic level (fish eating birds) is _____ respectively in aquatic food chains if DDT is 0.003 pb in water.

a) 0.025 ppm, 25 ppm
b) 0.003 ppm, 2 ppm
c) 0.5 ppm, 2 ppm      
d) 0.04 ppm, 2 ppm

Answer : A

Question : DDT causes egg shell thinning in birds because it inhibits

a) calmodulin             
b) calcium ATPase
c) magnesium ATPase
d) carbonic anhydrase

Answer : A

Question : Natural ageing of lake by biological enrichment of its water is called

a) biomagnification
b) eutrophication
c) biodegradation
d) water logging

Answer : B

Question : FOAM (Friends of the Arcata Marsh) is a group of citizens responsible for the integrated process of

a) reducing eutrophication
b) sewage and water treatment
c) radio- active waste treatment
d) minimizing global warming

Answer : B

Question : The ‘Polyblend’ is a/ an

a) recycled modified plastic waste used for laying the roads.
b) electronic waste buried in the landfills.
c) plastic film- waste to make disinfectants.
d) fine powder of plastic waste used to make the plastic bags

Answer : B  

Question :  Choose the incorrect statement

a) Dobson units are used to measure oxygen content

b) Use of incinerators is crucial to disposal of hospital wastes

c) Methane and carbon dioxide are green house gases

d) None of these

Answer :  Dobson units are used to measure oxygen content

Question :  Among the following which one causes more indoor chemical pollution?

a) burning mosquito coil

b) room spray

c) burning cooking gas

d) burning coal

Answer :  burning mosquito coil

Question :  The green scum seen in the fresh water bodies is

a) Both

b) blue green algae

c) green algae

d) None of these

Answer :  Both

Question :  The loudness of a sound that a person can withstand without discomfort is about

a) 80 dB.

b) 30 dB

c) 215 dB

d) 150 dB

Answer :  80 dB.

Question :  The major source of noise pollution, world wide is due to

a) transport system

b) sugar, textile and paper industries

c) oil refineries and thermal power plants

d) office equipment

Answer :  transport system

Question :

a) i-C, ii-D, iii-A, iv-B

b) i-D, ii-A, iii-B, iv-C

c) i-A, ii-C, iii-B, iv-D

d) I-C, ii-D, iii-B, iv-A

Answer :  i-C, ii-D, iii-A, iv-B

Question :  Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into:

a) carbon dioxide and water

b) carbon mono oxide

c) methane

d) carbon dioxide and methane

Answer :  carbon dioxide and water

Question :  Measuring Biochemical Oxygen Demand (BOD) is a method used for

a) Estimating the amount of organic matter in sewage water

b) Working out the efficiency of R.B.Cs. about their capacity to carry oxygen

c) Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale

d) None of these

Answer :  Estimating the amount of organic matter in sewage water

Question :  Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of

a) Calmodulin

b) Mg ATPase

c) Ca ATPase

d) None of these

Answer :  Calmodulin

Question :  Which of the following in sewage treatment removes suspended solids?

a) Primary treatment

b) Sludge treatment

c) Sludge treatment

d) None of these

Answer :  Primary treatment

Question :  Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into

a) carbon dioxide and water

b) carbon mono oxide

c) methane

d) carbon dioxide and methane

Answer :  carbon dioxide and water

Question :  Why is it necessary to remove sulphur from petroleum products?

a) To reduce the emission of sulphur dioxide in exhaust fumes

b) To increase efficiency of automobiles engines

c) To use sulphur removed from petroleum for commercial purposes

d) To increase the life span of engine silencers

Answer :  To reduce the emission of sulphur dioxide in exhaust fumes

Question :  Which one of the following impurities is easiest to remove from wastewater?

a) Suspended solids

b) Dissolved solids

c) Colloids

d) Bacteria

Answer :  Suspended solids

Question :  Which one of the following diseases is not due to contamination of water?

a) Hepatitis-B

b) Jaundice

c) Cholera

d) Typhoid

Answer :  Hepatitis-B

Question :  Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of

a) phosphorus

b) calcium

c) sulphur

d) carbon

Answer :  phosphorus

Question :  Algal blooms impart a distinct colour to water due to

a) their pigments

b) excretion of coloured substances

c) formation of coloured chemicals in water facilitated by physiological degradation of algae

d) absorption of light by algal cell wall

Answer :  their pigments

Question :

a) A iii, B iv, C i, D ii

b) A ii, B i, C iv, D iii

c) A iii, B ii, C iv, D i

d) A iii, B I, C iv, D i

Answer :  A iii, B iv, C i, D ii

Question :  In the textbook you came across Three Mile Island and Chernobyl disasters associated with accidental leakage of radioactive wastes. In India we had Bhopal gas tragedy. It is associated with which of the following?

a) Methyl Iso-Cyanate

b) Methy Cyanate

c) CFC’s

d) None of these

Answer :  Methyl Iso-Cyanate

Question :  Industrial melanism is an example of

a) Protective resemblance with the surrounding

b) Drug resistance

c) Defensive adaptation of skin against UV radiations

d) Darkening of skin due to industries

Answer :  Protective resemblance with the surrounding

Question :  Carbon dioxide is called green-house gas because it is

a) Transparent to sunlight but traps heat

b) Transparent to heat but traps sunlight

c) Transparent to heat but traps sunlight

d) None of these

Answer :  Transparent to sunlight but traps heat

 

Chapter 01 Reproduction in Organism
CBSE Class 12 Biology Reproduction in Organisms MCQs
Chapter 02 Sexual Reproduction in Flowering Plants
CBSE Class 12 Biology Sexual Reproduction in Flowering Plants MCQs
Chapter 03 Human Reproduction
CBSE Class 12 Biology Human Reproduction MCQs
Chapter 04 Reproductive Health
CBSE Class 12 Biology Reproductive Health MCQs
Chapter 05 Principles of Inheritance and Variation
CBSE Class 12 Biology Principles of Inheritance and Variation MCQs
Chapter 06 Molecular Basis of Inheritance
CBSE Class 12 Biology Molecular Basis of Inheritance MCQs
Chapter 07 Evolution
CBSE Class 12 Biology Evolution MCQs
Chapter 08 Human Health and Disease
CBSE Class 12 Biology Human Health and Disease MCQs
CBSE Class 12 Biology Respiration MCQs
Chapter 09 Strategies for Enhancement in Food Production
CBSE Class 12 Biology Strategies for Enhancement in Food Production MCQs
Chapter 10 Microbes in Human Welfare
CBSE Class 12 Biology Microbes in Human Welfare MCQs
Chapter 11 Biotechnology Principles and Processes
CBSE Class 12 Biology Biotechnology Principles and Processes MCQs
Chapter 12 Biotechnology and its Applications
CBSE Class 12 Biology Biotechnology and Its Applications MCQs
Chapter 13 Organisms and Populations
CBSE Class 12 Biology Organisms and Populations MCQs
Chapter 14 Ecosystem
CBSE Class 12 Biology Ecosystem MCQs
Chapter 15 Biodiversity and Conservation
CBSE Class 12 Biology Biodiversity and Conservation MCQs
Chapter 16 Environmental Issues
CBSE Class 12 Biology Environmental Issues MCQs

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