MCQ Chapter 16 Environmental Issues Class 12 Biology

Please refer to Environmental Issues MCQ Questions Class 12 Biology below. These MCQ questions for Class 12 Biology with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Environmental Issues will help you to prepare for the exams and get more marks.

Environmental Issues MCQ Questions Class 12 Biology

Please see solved MCQ Questions for Environmental Issues in Class 12 Biology. All questions and answers have been prepared by expert faculty of standard 12 based on the latest examination guidelines.

MCQ Questions Class 12 Biology Environmental Issues

Question- After the conventional sedimentation, filtering and chlorine, lots of dangerous pollutants still remain. To combat this, the biologists developed a series of six connected marshes where appropriate plants, algae, fungi and bacteria were seeded into this area, which
(A) Neutr se the pollutants
(B) Absorb the pollutants
(C) Assimilate the pollutants
(a) All are correct
(b) All are wrong
(c) All are correct except B
(d) All are correct except C

Question- Increasing skin cancer and high mutation rate are the result of
(a) Ozone depletion
(b) Acid rain
(c) CO pollution
(d) CO₂ pollution

Question- Of the following, pick out the constituents of a photochemical smog
A. Ozone B. Nitrogen oxides C. PAN D. H2SO4 E. DDT
F. BHC G. CO₂
(a) A, B, C
(b) A, B, C, G
(c) B, C, D, G
(d) A, B, C, E, F, G

Question- ___ are used in electrostatic precipitators.
(a) Catalysts
(b) Absorbers
(c) Electrodes
(d) Chemicals

Question- Algal bloom is caused by
(a) Availability of excess nutrients
(b) Lack of nutrients
(c) Increase in non-biodegradable pollutants
(d) Decreased BOD

Question- Which of the following is not an environmental problem ?
(a) Wastage of water
(b) Conservation of water
(c) Deforestation
(d) Land erosion

Question- Green muffler is used against which type of pollution?
(a) air
(b) soil
(c) water
(d) Meter

Question- Read the following statements given here below and select the right answer
(A) Kyota protocol, 1997 conference obtained commitments from different countries for reducing overall green house gas emission at level 5% below 1990 by 2008 – 2012
(B) Montreal protocol was signed in 1987
(C) Montreal protocol became effective in 1989
(D) Montreal protocol was signed to control the emission of ozone depleting substances.
(a) All are correct
(b) All are wrong
(c) All are correct except A
(d) All are correct except C

Question- What are organisms that can tolerate high degre es of pollution called as?
(a) Indicator species
(b) Extreme species
(c) Stenohy ne species
(d) Osmoconfirmers

Question- Which of the following is/are correct regarding Montreal Protocol?
(i) Persistent organic pollutants,
(ii) Global warming and climate change.
(iii) To control the emission of ozone depleting substances. ‘
(iv) Biosafety of genetically modified organisms.
(a) (ii) & (iii)
(b) (iii) only
(c) (iii) & (iv)
(d) (i) & (iii)

Question- When and where the Ozone hole was discovered?
(a) 1985, Antarctica
(b) 1985, Arctic
(c) 1987, Arctic
(d) 1987, Antarctica

Question- In treatment of waste water, biological treatment is –
(a) Secondary treatment
(b) Primary treatment
(c) Tertiary treatment
(d) Reverse osmosis stage

Question- Minamata disease is caused by contamination of
(a) Hg
(b) Pb
(c) Cd
(d) As

Question- The phenomenon by which certain pollutants (e.g. DOT) accumulate in body tissue in increasing concentration is called
(a) Biological magnification
(b) Biological reduction
(c) Bio-precipitation
(d) Bio-degradation

Question- In Effluent Treatment Plants (ETPs), at which stage microorganism treatment is provided?
(a) Primary
(b) Secondary
(c) Tertiary
(d) Microorganisms are not used in ETPs

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- The process of nutrient enrichment of water is called as _________.
(a) Eutrophication
(b) Stratification
(c) Atrophication
(d) Biomagnification

Question- In India, the Air (Prevention and Control of Pollution) Act came into force in 1981 but was amended in 1987 to include
(a) thermal pollution
(b) radioactive pollution
(c) noise pollution
(d) ozone pollution

Question- Which of the following pair(s) is / are correctly matched?
A. fossil fuel burning – CO₂ release
B. nuclear plant- Radioactive wastes
C. CO₂ – Green house effect
D. Montreal protocol – Control O3 depletion
(a) A, B
(b) A,B,C
(c) A, D
(d) A, B, C, D

Question- The effect of todays radioactive fall out will be harmful to children of future generation than to children because
(a) infants are more susceptible to radiations
(b) susceptibility to radiation increase with age
(c) mutated genes are frequently recessive
(d) contamination of milk supply is not cumulative

Question- Pick out the correct choice from the following
(a) As BOD increases, DO increases
(b) As BOD increases, DO decreases
(c) It depends on the water body and the surrounding environment
(d) No such relation exists between BOD & DO

Question- There working, ‘Eco San’ toilets in any areas of-
(a) Kerala
(b) Bihar
(c) Assam
(d) Mumbai

Question- Thickness of ozone is measured in
(a) Decibel
(b) Dozen
(c) water
(d) noise

Question- Which of the following is correct about “El Nino effect”?
(a) temperature rise leads to odd climatic changes
(b) cutting down the use of fossil fuels
(c) planting trees
(d) slowing down the growth of human population

Question- In a aquatic food chain polluted by DDT, the tissue concentration of DOT would be highest in
(a) Aquatic weed
(b) Herbivorous fish
(c) Carnivores fish
(d) Bird feeding on fish

Question- By what degrees has the mean global temperature increased in the 20th century?
(a) 0.2%
(b) 0.4%
(c) 0.6%
(d) 0.8%

Question- The Earth Summit, 1992, was held at
(a) Rio de Janeiro
(b) Kyoto
(c) St. Petersburg
(d) Washington

Question- Which is a non-degradable pollutant?
(a) Smoke
(b) Polythene
(c) Copper scraps
(d) Iron scraps

Question- DOT causes-
(a) Air pollution
(b) Water pollution
(c) Soil pollution
(d) AII

Question- Column I                    Column II
I. Arsenic                       (A) Minamata disease
II. Nitrate                      (B) Itai-itai
III. Mercury                   (C) Blue-baby syndrome
IV. Cadmium                   (D) Skeletal fluorosis
V. Fluoride                       (E) Black-foot disease
The correct matching is –
(a) !- B.ll- A, III-D, IV-E.V-C
(b) l- D.ll- A.III-B, IV-C.V-E
(c) l- C,ll- B, III-D, IV-A.V-E
(d) l- E.ll- C, III-A,IV-B;V-D

Question- Biological oxygen demand of _____ is the least,
(a) sewage
(b) sea water
(c) pure water
(d) polluted water

Question- Pollution in big cities can be controlled to a large extent by –
A. Improving traffic condition and road. B. Road side plantation
C. Proper disposal of garbage and domestic as well as municipal wastes.
D. Cannot be controlled
(a) A, B
(b) A, B, C
(c) A, D
(d) A, B, C, D

Question- Which method is used for the removal of sulphur dioxide and ammonia from the polluted air?
(a) Wet scrubbers
(b) Absorption
(c) Gravitational method
(d) Electrostatic precipitator

Question-. DDTA.
is a non-degradable pollutant
B. shows biomagnification
C. is harmful to fishes and birds
D. is a pesticide
(a) Only D is correct
(b) Only B and G are correct
(c) None is correct
(d) All are correct

Question- Which of the following is a natural pollutant?
(a) Smog
(b) Volcanic gases
(c) Strong wind
(d) Gale

Question- BOD is ____ in polluted water and ____ in potable water.
(a) more, less
(b) less, medium
(c) medium, more
(d) less, more

Question- In India, Jhum cultivation is practiced mainly in
(a) North East states
(b) Gangetic plains
(c) Dobson
(d) Deccan plateau

Question- Volcano is ___ source of pollution.
(a) artificial
(b) natural
(c) both
(d) man-made

Question- Two lakes, A & B are identical in all aspects except that lake A has higher temperature. Which of the following is true?
(a) A has higher rate of Oxyaen dissolution
(b) B has higher rate of Oxygen dissolution
(c) Oxygen dissolution of both is the same
(d) Both have same BOD

Question- ____ is the first step of sewage treatment,
(a) Precipitation
(b) Chlorination
(c) Sedimentation
(d) Aeration

Question- Which of the following will be found in polluted water?
A. B. G. A B. Larvae of stonefly C. water hyacinth D. sewage fungi
(a) A,B
(b) A,B,C
(c) A, C, D
(d) A, B, C, D

Question- Primary pollutants used in the synthesis of photochemical smog are –
(a) Unsaturated HCs
(b) oxides of nitrogen
(c) Ozone
(d) Both a and b

Question- Identify the correct matches –
A. Environmental (protection) act, 1986 — Protection and qu ty improvement of air, water and soil.
B. Kyota protocol — To mitigate climate change, to reduce green house gases
C. Montreal protocol — ODS reduction
D. Chipko movement — Trees protection
(a) A, B
(b) A, B, C
(c) A, B, D
(d) A, B, C, D

Question- We and our surroundings together are called…
(a) environment
(b) atmosphere
(c) lithosphere
(d) hydrosphere

Question- Limit of BOD prescribed by Central Pollution control Board for the discharge of industrial and municipal waste water into natural surface water, is –
(a) < 30 ppm
(b) < 3.0 ppm
(c) < 10 ppm
(d) 100 ppm

Question- Choose the odd one out w.r.t. ozone depletion in the stratosphere
(a) UV rays have the ability to both degrade as well as form ozone layer
(b) UV rays are depleting the good ozone in the troposphere
(c) CFC’s are disturbing the balance of ozone equilibrium
(d) UV-B rays cause inflammation of cornea called snow blindness

Question-Which pollutants are responsible for bronchitis ?
(a) O₂,CO₂
(b) CO,C0₂
(c) SO₂,NO₂
(d) CI₂,H₂S

Question- Concentration of DOT for first trophic level (phytoplanktons) and top trophic level (fish eating birds) is respectively
in aquatic food chains if DOT is 0.003 ppb in water –
(a) 0.025ppm, 25ppm
(b) 0.003 ppm, 2 ppm
(c) 0.5ppm, 2 ppm
(d) 0.04 ppm, 2 ppm

Question- Due to eutrophication___.
(a) water gets less harmful
(b) BOD decreases
(c) algae are destroyed
(d) BOD increases

Question- Which method is used to control pollutants of particulate nature ?
(a) Combustion
(b) Absorption
(c) Electrostatic precipitators
(d) Oxidation pond