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Biology M.C.Q (1 Marks)

Environmental Issues · Uttarakhand Board (UBSE) STD 12 Science (Uttarakhand - English Medium). 282 questions.

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M.C.Q (1 Marks)

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MCQ 11 Mark
What is $\text{BOD}?$
  • A
    The amount of $O_2$ utilized by organisms in water.
  • ✓
    The amount of $O_2$ utilized by microorganisms for decomposition.
  • C
    The total amount of $O_2$ present in water.
  • D
    All of the above.
Answer
Correct option: B.
The amount of $O_2$ utilized by microorganisms for decomposition.
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MCQ 21 Mark
Air pollution is maximum by:
  • ✓
    Automobile exhausts and chemicals from industries.
  • B
    Sewage and pesticides
  • C
    Detergents and pesticides
  • D
    Sewage and effluents
Answer
Correct option: A.
Automobile exhausts and chemicals from industries.
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MCQ 31 Mark
The green scum seen in the fresh water bodies is:
  • ✓
    Both.
  • B
    Blue green algae.
  • C
    Green algae.
  • D
    None of these.
Answer
Correct option: A.
Both.
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MCQ 41 Mark
Greenhouse effect refers to:
  • A
    Cooling of Earth
  • B
    Trapping of $\text{UV}$ rays
  • C
    Production of cereals
  • ✓
    Warming of Earth
Answer
Correct option: D.
Warming of Earth
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MCQ 51 Mark
Which of the following is absent in polluted water?
  • A
    Hydrilla.
  • B
    Water hyacinth.
  • ✓
    Larva of stone fly.
  • D
    Blue$-$green algae.
Answer
Correct option: C.
Larva of stone fly.
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MCQ 61 Mark
The day$-$to$-$day condition of the atmosphere at a place with respect to the $.........$ is called the weather at that place.
  • A
    Temperature
  • B
    Humidity, rainfall
  • C
    Wind$-$speed
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
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MCQ 71 Mark
The ‘Polyblend’ is $a/ an:$
  • ✓
    Electronic waste buried in the landfills.
  • B
    Recycled modified plastic waste used for laying the roads.
  • C
    Plastic film$-$waste to make disinfectants.
  • D
    Fine powder of plastic waste used to make the plastic bags.
Answer
Correct option: A.
Electronic waste buried in the landfills.
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MCQ 81 Mark
A water body has high $\text{BOD},$ indicating that water is:
  • ✓
    Being contaminated with sewage.
  • B
    Being aerated
  • C
    Receiving minerals
  • D
    Atrophic
Answer
Correct option: A.
Being contaminated with sewage.
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MCQ 91 Mark
Full form of $\text{CEPHRI}.$
  • A
    Centre for Environmental and Personal Health Research Institute.
  • B
    Central for Engineering and Public Health Report Institute.
  • ✓
    Central Environmental and Public Health Engineering Research Institute.
  • D
    None of these
Answer
Correct option: C.
Central Environmental and Public Health Engineering Research Institute.
An institution established in India, to center radioactive pollution $i.e.$ Central Environmental and Public Health engineering Institute.
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MCQ 101 Mark
Which one of the following is the correct percentage of $($the two out of four$)$ greenhouse gases that contribute to the total global warming?
  • A
    $N_2O \ 6\% , CO_2 \ 86\%$
  • B
    Methane $20\% , N_2O \ 18\%$
  • ✓
    $\text{CFC} \ 14\%,$ Methane $20\%$
  • D
    $CO_2 \ 40\%, \text{CFC} \ 30\%$
Answer
Correct option: C.
$\text{CFC} \ 14\%,$ Methane $20\%$
Greenhouse gasses generally traps the radiations of the earth which leads to increase in the temperature of the earth and global warming.
The greenhouse gasses includes water vapor, carbon dioxide, methane, nitrous oxide, and ozone. The concentration of ozone is $14\%$ and methane is $20\%.$
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MCQ 111 Mark
Which of the following does not affect ozone layer?
  • ✓
    $\mathrm{Cl}_2$
  • B
    $\mathrm{CH}_3 \mathrm{Cl}$
  • C
    $\text{NO}$
  • D
    $\mathrm{CFCl}_3$
Answer
Correct option: A.
$\mathrm{Cl}_2$
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MCQ 121 Mark
'Biological Oxygen Demand' $\text{(BOD)}$ is a measure of:
  • A
    Industrial wastes poured into water bodies.
  • ✓
    Extent to which water is polluted with organic compounds.
  • C
    Amount of carbon monoxide inseparably combined with haemoglobin.
  • D
    Amount of oxygen needed by green plants during night.
Answer
Correct option: B.
Extent to which water is polluted with organic compounds.
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MCQ 131 Mark
Which of the following causes biomagnification?
  • A
    $SO_2$
  • B
    Mercury.
  • C
    $\text{DDT}.$
  • ✓
    Both $(b)$ and $(c).$
Answer
Correct option: D.
Both $(b)$ and $(c).$
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MCQ 141 Mark
Destruction of ozone can cause:
  • A
    Skin cancer
  • B
    Cataract
  • C
    Hinder growth of plant
  • ✓
    All of these
Answer
Correct option: D.
All of these
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MCQ 151 Mark
Many wild animals have either become extinct or are endangered mainly due to:
  • A
    Scarcity of food
  • B
    Over crowding
  • C
    Hunting
  • ✓
    Deforestation
Answer
Correct option: D.
Deforestation
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MCQ 161 Mark
The harmful and unwanted substances which degrade the quality of water are called as $..........$
  • ✓
    Water pollutants
  • B
    Soil pollutants
  • C
    Air pollutants
  • D
    None of the above
Answer
Correct option: A.
Water pollutants
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MCQ 171 Mark
Which of the following is not used for disinfection of drinking water?
  • ✓
    Phenyl
  • B
    Chloramine
  • C
    Chlorine
  • D
    Ozone
Answer
Correct option: A.
Phenyl
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MCQ 181 Mark
Through food chain radioactive $Sr$ is deposited in which part of human body?
  • A
    Muscles
  • B
    Thyroid
  • C
    Kidnies
  • ✓
    Bones
Answer
Correct option: D.
Bones
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MCQ 191 Mark
$\text{UV}$ light radiation cause:
  • A
    Formation of pyrimidines
  • B
    Photodynamic action
  • ✓
    Breakage of hydrogen bonds in $\text{DNA}.$
  • D
    Protein denaturation
Answer
Correct option: C.
Breakage of hydrogen bonds in $\text{DNA}.$
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MCQ 201 Mark
What are the chief pollutants of the atmosphere, which are most likely to deplete the ozone layer?
  • A
    Sulphur dioxide
  • ✓
    Nitrogen oxide and Fluorocarbons
  • C
    Carbon dioxide
  • D
    Carbon monoxide
Answer
Correct option: B.
Nitrogen oxide and Fluorocarbons
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MCQ 211 Mark
Characteristic algal growth and water bloom are usually caused by:
  • A
    Red algal.
  • B
    Brown algal.
  • ✓
    Blue green and green algal.
  • D
    Bacteria.
Answer
Correct option: C.
Blue green and green algal.
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MCQ 221 Mark
Which of the following enhances $\text{B.O.D.}$ of water?
  • ✓
    Sugar mill effluents
  • B
    Algae
  • C
    Sand
  • D
    Moss
Answer
Correct option: A.
Sugar mill effluents
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MCQ 231 Mark
The major pollutants to deplete ozone are:
  • ✓
    Chlorofluorocarbons
  • B
    Nitrogen oxides
  • C
    Hydrocarbons
  • D
    All of the above
Answer
Correct option: A.
Chlorofluorocarbons
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MCQ 241 Mark
Good ozone is found in the:
  • ✓
    Stratosphere.
  • B
    Troposphere.
  • C
    Mesosphere.
  • D
    Ionosphere.
Answer
Correct option: A.
Stratosphere.
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MCQ 251 Mark
Deforestation generally decreases:
  • ✓
    Rainfall
  • B
    Soil erosion
  • C
    Drought
  • D
    Global warming
Answer
Correct option: A.
Rainfall
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MCQ 261 Mark
The ultimate environmental hazard or the most outstanding danger for the survival of living beings on this planet is:
  • ✓
    Radiation hazard or nuclear pollution
  • B
    Glaciation
  • C
    Deforestation
  • D
    Desertification
Answer
Correct option: A.
Radiation hazard or nuclear pollution
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MCQ 271 Mark
Non$-$biodegradable pollutants are created by:
  • ✓
    Humans.
  • B
    Natural disasters.
  • C
    Excessive use of resources.
  • D
    Nature.
Answer
Correct option: A.
Humans.
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MCQ 281 Mark
Ozone depletion is occurring due to:
  • A
    $\text{PCB}$
  • B
    $\text{CO}$
  • C
    $\text{PAN}$
  • ✓
    None of the above
Answer
Correct option: D.
None of the above
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MCQ 291 Mark
What is the main source of water pollution in India?
  • A
    Discharge of untreated sewage
  • B
    Bathing
  • C
    Discharge of industrial waste
  • ✓
    Both $A$ and $C$
Answer
Correct option: D.
Both $A$ and $C$
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MCQ 301 Mark
Which one of the following gases can deplete ozone layer in the upper atmosphere?
  • A
    Ammonia
  • ✓
    Methane
  • C
    Carbon monoxide
  • D
    None of the above
Answer
Correct option: B.
Methane
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MCQ 311 Mark
Which one of the following impurities is easiest to remove from wastewater?
  • A
    Dissolved solids.
  • B
    Colloids.
  • C
    Bacteria.
  • ✓
    Suspended solids.
Answer
Correct option: D.
Suspended solids.
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MCQ 321 Mark
$\text{DDT}$ concentration in the human body is:
  • A
    $0.3-0.7 \ \text{ppm}$
  • B
    $1.3-3.1 \ \text{ppm}$
  • ✓
    $13-31 \ \text{ppm}$
  • D
    $30-70 \ \text{ppm}$
Answer
Correct option: C.
$13-31 \ \text{ppm}$
In India as a result of prolonged use of $\text{DDT} \ 13-31 \ \text{ppm}$ of $\text{DDT}$ can be detected in the body fat of the people.
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MCQ 331 Mark
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.
  • ✓
    Large areas will become deserts.
  • D
    Crop breeding programmes will suffer due to a reduced availability of variety of germplasm.
Answer
Correct option: C.
Large areas will become deserts.
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MCQ 341 Mark
Which one of the following pair is mismatched?
  • A
    Biomass burning $-$ Release of $CO_2$.
  • B
    Fossil fuel burning $-$ Release of $CO_2$.
  • C
    Nuclear power $-$ Radioactive wastes.
  • ✓
    Solar energy $-$ Green$-$house effect.
Answer
Correct option: D.
Solar energy $-$ Green$-$house effect.
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MCQ 351 Mark
What are the consequences of deforestation?
  • A
    Soil erosion
  • B
    Loss of biodiversity
  • C
    Floods and droughts and climate change due to global warming.
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
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MCQ 361 Mark
High $\text{BOD}$ values for a river means that river water:
  • A
    Have no microbes
  • B
    Have more bacteria
  • ✓
    Is highly polluted
  • D
    Is highly clean
Answer
Correct option: C.
Is highly polluted
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MCQ 371 Mark
The ozone layer 'ozonosphere' occurs in:
  • A
    Thermosphere
  • B
    Troposphere
  • ✓
    Stratosphere
  • D
    Heterosphere
Answer
Correct option: C.
Stratosphere
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MCQ 381 Mark
Ultraviolet light causes:
  • ✓
    Destruction of hydrogen bonds between complementary $\text{DNA}$ strands.
  • B
    Photodynamic action
  • C
    Sticky metaphases
  • D
    Formation of pyrimidines
Answer
Correct option: A.
Destruction of hydrogen bonds between complementary $\text{DNA}$ strands.
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MCQ 391 Mark
The worst enemy of ozone is:
  • A
    Liquid $\ce{NH_3}$
  • B
    $\ce{SO_2}$
  • C
    $\ce{CH_4}$
  • ✓
    $\text{CFCs}$
Answer
Correct option: D.
$\text{CFCs}$
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MCQ 401 Mark
Non$-$biodegradable pollutants are created by:
  • A
    Nature.
  • B
    Excessive use of resources.
  • ✓
    Humans.
  • D
    Natural disasters.
Answer
Correct option: C.
Humans.
Human beings have created and use various non$-$biodegradable substances and end up creating lot pollution in the process.
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MCQ 411 Mark
Which of the following damages $\text{WBC},$ bone marrow and lymph nodes?
  • A
    $Ca^{40}$
  • ✓
    $I^{131}$
  • C
    $Sr^{90}$
  • D
    Caesium
Answer
Correct option: B.
$I^{131}$
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MCQ 421 Mark
The scrubber is used mainly to remove which of the following gas$/$es from the exhaust after spraying water$/$ lime?
  • A
    $CO_2$.
  • ✓
    $SO_2$.
  • C
    $O_2$ and $N_2$.
  • D
    $CO$ and $CO_2$.
Answer
Correct option: B.
$SO_2$.
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MCQ 431 Mark
Ozone$-$layer is getting depleted because of:
  • A
    Excessive use of automobiles.
  • B
    Excessive formation of industrial units.
  • ✓
    Excessive use of man made compounds containing both fluorine and chlorine.
  • D
    Excessive deforestation.
Answer
Correct option: C.
Excessive use of man made compounds containing both fluorine and chlorine.
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MCQ 441 Mark
What is the main cause for the extinction of some species in tropical forest?
  • ✓
    Deforestation
  • B
    Afforestation
  • C
    Pollution
  • D
    Soil erosion
Answer
Correct option: A.
Deforestation
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MCQ 451 Mark
In reforestation, the planted trees should generally be of the same $.............,$ which were found in forests.
  • A
    Family
  • B
    Kingdom
  • ✓
    Species
  • D
    Class
Answer
Correct option: C.
Species
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MCQ 461 Mark
$\text{C.O.D.}$ stands for:
  • ✓
    Chemical oxygen demand
  • B
    Control of diesel
  • C
    Csiumoxide deposition
  • D
    Cemistry of depositions
Answer
Correct option: A.
Chemical oxygen demand
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MCQ 471 Mark
Match correctly the following and choose the correct option:
$i$ Environment Protection Act $A.$ $1974$
$ii$ Air Prevention $\&$ Control of Pollution Act $B.$ $1987$
$iii$ Water Act $C.$ $1986$
$iv$ Amendment of Air Act to include noise $D.$ $1981$
The correct matches is;
  • ✓
    $\text{i-C, ii-D, iii-A, iv-B}$
  • B
    $\text{i-A, ii-C, iii-B, iv-D}$
  • C
    $\text{i-D, ii-A, iii-B, iv-C}$
  • D
    $\text{i-C, ii-D, iii-B, iv-A}$
Answer
Correct option: A.
$\text{i-C, ii-D, iii-A, iv-B}$
$i$ Environment Protection Act $C.$ $1986$
$ii$ Air Prevention $\&$ Control of Pollution Act $D.$ $1981$
$iii$ Water Act $A.$ $1974$
$iv$ Amendment of Air Act to include noise $B.$ $1987$
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MCQ 481 Mark
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.
  • ✓
    Electrostatic precipitator.
Answer
Correct option: D.
Electrostatic precipitator.
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MCQ 491 Mark
Match correctly the the following and choose the correct option.
$i.$
Environment Protection Act
 $A.$ $1974$
$ii.$
Air Prevention $\&$ Control of Pollution Act
 $B.$ $1987$
$iii.$
Water Act
 $C.$ $1986$
$iv.$
Amendment of Air Act to include noise. The correct matches is;
 $D.$ $1981$
  • ✓
    $\text{i-C, ii-D, iii-A, iv-B}$
  • B
    $\text{i-D, ii-A, iii-B, iv-C}$
  • C
    $\text{i-A, ii-C, iii-B, iv-D}$
  • D
    $\text{i-C, ii-D, iii-B, iv-A}$
Answer
Correct option: A.
$\text{i-C, ii-D, iii-A, iv-B}$
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MCQ 501 Mark
An effect of deforestation is:
  • A
    Desertification
  • B
    Soil erosion and floods
  • C
    Depletion of wildlife
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
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M.C.Q (1 Marks) - Biology STD 12 Science Questions - Vidyadip