#16 Biology Class XII- Environmental Issues (NEET, MHTCET) MCQ
1) 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.
Answer
(c) increases when sewage gets mixed with river water
2) Montreal Protocol aims at
(a) biodiversity conservation
(b) control of water pollution
(c) control of CO2 emission
(d) reduction of ozone depleting substances
Answer
(d) reduction of ozone depleting substances
3) The two gases making highest relative contribution to greenhouse gases are
(a) CO2 and CH4
(b) CH4 and N2O
(c) CFCs and N2O
(d) CO2 and N2O
Answer
(a) CO2 and CH4
4) Eutrophication is often seen in
(a) deserts
(b) fresh water lakes
(c) ocean
(d) mountains
Answer
(b) fresh water lakes
5) “Good ozone” is found in the
(a) mesosphere
(b) troposphere
(c) stratosphere
(d) ionosphere
Answer
(c) stratosphere
6) In an area where DDT had been used extensively 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 laid eggs, did not hatch
Answer
(d) many of the birds laid eggs, did not hatch
7) Non-biodegradable pollutants are created by [NCERT Exemplar]
(a) nature
(b) excessive use of resources
(c) humans
(d) natural disasters
Answer
(c) humans
8) Compressed Natural Gas (CNG) is [NCERT Exemplar]
(a) propane
(b) methane
(c) ethane
(d) butane
Answer
(b) methane
9) World’s most problematic aquatic weed is [NCERT Exemplar]
(a) Azolla
(b) Wolffia
(c) Eichhornia
(d) Trapa
Answer
(c) Eichhornia
10) Which of the following exhibits biomagnification? [NCERT Exemplar]
(a) SO2
(b) Mercury
(c) DDT
(d) Both (b) and (c)
Answer
(d) Both (b) and (c)
11) Match the items given in Column I with those in Column II and select the correct option given below:
Column I Column II
A. Eutrophication (i) UV-B radiation
B. Sanitary landfills (ii) Deforestation
C. Snow blindness (iii) Nutrient enrichment
D. Jhum cultivation (iv) Waste diposal
(a) A-(iii), B-(iv), C-(i), D-(ii)
(b) A-(i), B-(iii), C-(iv), D-(ii)
(c) A-(ii), B-(i), C-(iii), D-(iv)
(d) A-(i), B-(ii), C-(iv), D-(iii)
Answer
(a) A-(iii), B-(iv), C-(i), D-(ii)
12) The expanded form of DDT is [NCERT Exemplar]
(a) dichloro diphenyl trichloroethane
(b) dichloro diethyl trichloroethane
(c) dichloro dipyrydyl trichloroethane
(d) dichloro diphenyl tetrachloroacetate
Answer
(a) dichloro diphenyl trichloroethane
13) Which of the following material takes the longest time for biodegradation? [NCERT Exemplar]
(a) Cotton
(b) Paper
(c) Bone
(d) Jute
Answer
(c) Bone
14) Choose the incorrect statement. [NCERT Exemplar]
(a) The Montreal protocol is associated with the control of emission of ozone depleting substances
(b) Methane and carbon dioxide are green house gases
(c) Dobson units are used to measure oxygen content of air
(d) Use of incinerators is crucial to disposal of hospital wastes
Answer
(c) Dobson units are used to measure oxygen content of air
15) Among the following which one causes maximum indoor chemical pollution? [NCERT Exemplar]
(a) Burning coal
(b) Burning cooking gas
(c) Burning mosquito coil
(d) Room spray
Answer
(a) Burning coal
16) The green scum seen in the fresh water bodies is: [NCERT Exemplar]
(a) blue green algae
(b) red algae
(c) green algae
(d) both (a) and (c)
Answer
(d) both (a) and (c)
17) The major source of noise pollution world wide is due to [NCERT Exemplar]
(a) office equipment
(b) transport system
(c) sugar, textile and paper industries
(d) oil refineries and thermal power plants.
Answer
(b) transport system
18) Match the following and choose the correct option. [NCERT Exemplar]
Column I Column II
A. Environment Protection Act (i) 1974
B. Air Prevention & Control of Pollution Act (ii) 1987
C. Water Act (iii) 1986
D. Amendment of Air Act to include noise (iv) 1981
as an air pollutant
The correct matches is
(a) A-(iii), B-(iv), C-(i), D-(ii)
(b) A-(i), B-(iii), C-(ii), D-(iv)
(c) A-(iv), B-(i), C-(ii), D-(iii)
(d) A-(iii), B-(iv), C-(ii), D-(i)
Answer
(a) A-(iii), B-(iv), C-(i), D-(ii)
19) Increased rate of skin cancer and mutation might be because of
(a) increase in CO2 concentration
(b) increase in CO concentration
(c) ozone layer depletion
(d) acid rain
Answer
(c) ozone layer depletion
20) Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into [NCERT Exemplar]
(a) carbon dioxide and water
(b) carbon monoxide
(c) methane
(d) carbon dioxide and methane
Answer
(a) carbon dioxide and water
21) Why is it necessary to remove sulphur from petroleum products? [NCERT Exemplar]
(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
(a) To reduce the emission of sulphur dioxide in exhaust fumes
22) Which one of the following impurities is easiest to remove from wastewater? [NCERT Exemplar]
(a) Bacteria
(b) Colloids
(c) Dissolved solids
(d) Suspended solids
Answer
(d) Suspended solids
23) Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of [NCERT Exemplar]
(a) carbon
(b) sulphur
(c) calcium
(d) phosphorus
Answer
(d) phosphorus
24) Algal blooms impart a distinct colour to water due to [NCERT Exemplar]
(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
(a) their pigments
25) Match the items in column I and column II and choose the correct option. [NCERT Exemplar]
Column I Column II
A. UV (i) Biomagnification
B. Biodegradable Organic matter (ii) Eutrophication
C. DDT (iii) Snow blindness
D. Phosphates (iv) BOD
The correct match is:
(a) A-(ii), B-(i), C-(iv), D-(iii)
(b) A-(iii), B-(ii), C-(iv), D-(i)
(c) A-(iii), B-(iv), C-(i), D-(ii)
(d) A-(iii), B-(i), C-(iv), D-(ii)
Answer
(c) A-(iii), B-(iv), C-(i), D-(ii)
26) 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? [NCERT Exemplar]
(a) CO2
(b) Methyl Isocyanate
(c) CFC
(d) Methyl Cyanate
Answer
(b) Methyl Isocyanate
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