CBSE Questions for Class 12 Medical Biology Environmental Issues Quiz 14 - MCQExams.com

Chief air pollutant which is likely to deplete ozone layer is ________.
  • Sulphur dioxide
  • Carbon dioxide
  • Carbon monoxide
  • Nitrogen oxides and fluorocarbons
In coming years, skin related disorders will become more common due to ________.
  • Excessive use of detergents
  • Water pollution
  • Air pollution
  • Depletion of ozone layer
Depletion of ozone layer is due to _______.
  • Oxides of nitrogen
  • Oxides of carbon
  • Oxides of sulphur
  • None of the above
Peeling of ozone umbrella is due to
  • CFCs
  • PAN
  • $$CO_2$$
  • Coal burning
Natural sink of stratospheric ozone is?
  • Sulphuric dioxide
  • Sulphur fluxes of oceans
  • Freons
  • HCFCs
Chlorofluorocarbon releases ______ which is harmful to ozone.
  • Fluorine
  • Chlorine
  • Nitrogen peroxide
  • Sulphur dioxide
DDT concentration recorded in human body has been
  • $$0.3-0.7$$ ppm
  • $$1.3-3.1$$ ppm
  • $$13-31$$ ppm
  • $$30-70$$ ppm
Ozone hole is caused by
  • Acetylene
  • Ethylene
  • Chlorofluorocarbons
  • Methane
Phosphate pollution is caused by _______.
  • Weathering of phosphate rocks only
  • Agriculture fertilizers
  • Phosphate rocks and sewage
  • Sewage and agricultural fertilizers
Result of ozone hole is
  • Green house effect
  • Global warming
  • Acid rain
  • UV radiations reach the earth
Chlorofluorocarbons are not being used in refrigerators because they
  • Increase temperature
  • Cause allergic reactions
  • Deplete ozone
  • Both A and B
Drinking mineral water/aerated drink with low levels $$(\sim 0.02$$ ppm) of pesticide for long period would
  • Cause cancer of intestine
  • Pesticide accumulation in the body
  • Cause leukaemia
  • Produce immunity against mosquito
Role of CFC present in atmosphere is
  • Reduction in ozone
  • Ozone formation
  • Formation of leghaemoglobin
  • Enhance chlorophyll formation
BOD is measure of.
  • Industrial waste being poured in water body
  • Extent of pollution with organic compounds
  • CO combined with haemoglobin
  • $$O_2$$ required by green plants during night
Ozone hole causes
  • Global warming
  • Reduction in the rate of photosynthesis
  • More ultraviolet rays come to earth
  • All of the above
Chlorofluorocarbons are responsible for
  • Acid rain
  • Ozone layer depletion
  • Global warming
  • Thermal inversion
A hyper metal accumulator is
  • Daucos carota

  • Nicotiana tabacum

  • Arabidopsis

  • Thlaspi goesingensis

A water body has high BOD indicating that water is
  • Being contaminated with sewage
  • Being aerated
  • Receiving minerals
  • Atrophic
Melanin protects us from
  • X-rays
  • Infra-red rays
  • Visible rays
  • UV rays
Antiknocking agent of unleaded petrol is
  • Dibromomethane
  • Methyl-ethyl ether
  • Propane
  • Methyl tert. butyl ether
Which one of the following will not control particulate pollutants?
  • Incinerator
  • Arrester
  • Scrubber
  • Filter
  • Electrostatic precipitator
Catalytic convertor brings about
  • Complete oxidation of hydrocarbons
  • Oxidation of carbon monoxide to carbon dioxide
  • Reduction of nitrogen oxide to nitrogen
  • All of the above
An ozone depleting chemical, which is used in fire- extinguishers is ________.
  • Nitrogen oxide
  • Methyl bromide
  • Halon
  • Chlorofluorocarbon
Catalytic converter used for controlling pollution is used in
  • Thermal plants
  • Chimneys
  • Brick kilns
  • Motor vehicles
Antinocking agent added to petrol is commonly
  • Tetramethyl or tetraethyl lead
  • Dibromoethane
  • Both A and B
  • Octane
Excess atmospheric $$CO_2$$ increases green house effect as $$CO_2$$
  • Is opaque to infra-red rays
  • Is not opaque to infra-red rays
  • Precipitates dust in the atmosphere
  • Reduces atmospheric pressure
The beaches in Kerala are radioactive due to
  • Uranium - 238
  • Radon - 222
  • Radium - 224
  • Thorium 232
Eutrophication of water bodies leading to killing of fishes in mainly due to
  • Non-availability of oxygen
  • Non-availability of light
  • Non-availability of food
  • Non-availability of essential minerals
Which of the following is correct?
  • Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
  • Cyanobacteria, Anabaena and Nostoc are mobilizers of phosphates and plant nutrition in soil.
  • At present it is not possible to grow maize without chemical fertilizers.
  • Excessive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
Which is the correct ascending arrangement of BOD of sewage(S) distillery effluent(DE), paper mill effluent(PE) and sugar mill effluent(SE)?
  • SE$$<$$PE$$<$$S$$<$$DE
  • PE$$<$$S$$<$$SE$$<$$DE
  • S$$<$$DE$$<$$PE$$<$$SE
  • SE$$<$$S<$$PE$$<$$DE
Which is not a proper strategy to reduce global warming?
  • Developing substitutes of chlorofluorocarbons.
  • Increasing use of air conditioners, refrigeration units and production of plastic foams and propellants in aerosol spray cans.
  • Minimising use of nitrogen fertilizers in agriculture for reducing nitrogen oxide emission.
  • Increase vegetation cover, particularly forest, for photosynthetic utilisation of $$CO_2$$.
  • Reducing green house gas emission by limiting use of fossil fuels.
Polychlorinated biphenyls are chemicals useful as
  • Fire-resistants
  • Fertilisers
  • Pesticides
  • Germicides
The biggest cause of reactor mishap is
  • Radioactivity in coolant
  • Meltdown of reactor core
  • Crumbling of concrete covering
  • Sinking of ground
Exposure of UV radiations causes
  • Damage to eye sight
  • Sunburn
  • Skin cancer
  • All of the above
Chernobyl is known for its
  • Reactor mishap
  • Acid rain
  • Water-logging
  • Salinisation of soil
Which metal causes harmful effect?
  • Lead
  • Cobalt
  • Uranium
  • All of the above
An efficient device to eliminate particulate matter from industrial emission is
  • Pyrolysis
  • Cyclone separators
  • Incineration
  • Electrostatic precipitators
  • Trajectory separators
Snow blindness is cause due to
  • Ozone hole
  • Nuclear winter
  • Acid rain
  • Green house effect
Which one of the following is correct?
  • Catalytic converter can precipitate particular matter of less than $$2.5$$ $$\mu$$m.
  • Histones are acidic and form core of DNA packing.
  • Template with $$5'\rightarrow 3'$$ polarity shows continuous DNA replication.
  • Lactobacillus is not present in dough used for idli preparation.
In human body, chlorinated hydrocarbons accumulate in
  • Bones
  • Brain
  • Fatty tissue
  • Skin
A large quantity of urban sewage is drained to a nearby river. Which among the given conditions would happen after mixing of sewage into the river?
(i) BOD of receiving water body increases.
(ii) DO of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures.
(iv) It will lead to nutrient enrichment of receiving water body.
  • i, ii and iii
  • i, ii and iv
  • ii and iii
  • iii and iv
Gaseous pollutants are controlled through
  • Adsorption
  • ESP
  • Arrestors
  • Pyrolysis
  • Incineration
Relation between DO and BOD is that they
  • Are directly proportional
  • Are inversely proportional
  • Are not related
  • Always remain equal to each other
Arrange according to ascending order of BOD.
(a) Highly polluted pond water
(b) Unpolluted pond water
(c) Distilled water
  • b-c-a
  • c-b-a
  • c-a-b
  • a-c-b
Identify the wrong statement with reference to UV rays.
  • UV-A is more harmful to animals than UV-B.
  • UV radiation falls in the range between 100-300 nm wavelength.
  • UV radiation is classified into three categories.
  • UV radiation kills microorganisms.
Which of the following statement/s is/are correct with regard to ozone depletion:
The ozone hole is measured in terms of ozone concentrations, which is expressed in Dobson units.
The major cause for ozone depletion is the presence of CFCs in the stratosphere - CFCs are entirely man-made and not found naturally.
  • Only 1
  • Only 2
  • Both A and B
  • None of the above
Which among the following pairs is incorrectly matched?
Protocol/Convention : Issue
  • Montreal Protocol: On substances that deplete ozone layer
  • Cartagena Protocol: Safe transfer, handling, and use of living modified organisms
  • Nagoya Protocol: Access and benefit sharing of genetic resources
  • Bonn Convention: Reduction of greenhouse gases in time bound manner
Which of the following produces maximum sound pollution?
  • Top music
  • Heavy truck
  • Jet flight
  • Car honking 
Storm is caused by the _______________.
  • Depletion of ozone layer
  • Presence of high humidity in the atmosphere
  • Rapid accumulation of $$CO_2$$ in the atmosphere
  • Rapid build-up of products of photochemical oxidation of pollutants in the atmosphere
A river/ lake with an inflow of domestic sewage rich in organic waste may result in
  • Death of fish due to lack of oxygen
  • Drying of the river/lake very soon due to algal bloom
  • Increase population of aquatic food web organisms
  • An increased production of fish due to biodegradable nutrients
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Medical Biology Quiz Questions and Answers