M.C.Q (1 Marks)

MCQ 1011 Mark

The stratospheric ozone depletion leads to?

A
Global warming
B
Increase in the incidence of skin cancers.
C
Forest fires
✓
All of the above

Answer

Correct option: D.

All of the above

MCQ 1021 Mark

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
$\text{Mg ATP}$ ase.
B
$\text{Ca ATP}$ ase.
✓
Calmodulin.
D
None of these.

Answer

Correct option: C.

Calmodulin.

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MCQ 1031 Mark

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
$\mathrm{CO}_2$
✓
Methyl Iso$-$Cyanate
C
$\text{CFC’s}$
D
Methy Cyanat

Answer

Correct option: B.

Methyl Iso$-$Cyanate

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MCQ 1041 Mark

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

A
Lantana.
B
Eichhornia.
C
Brown algae.
✓
Parthenium $($carrot grass$).$

Answer

Correct option: D.

Parthenium $($carrot grass$).$

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MCQ 1051 Mark

Recurrence of floods in the plains of North India is due to excessive:

A
Siltation of dams
B
Rainfall
C
Agriculture
✓
Deforestation in catchment area

Answer

Correct option: D.

Deforestation in catchment area

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MCQ 1061 Mark

Which of the following strategy is not useful for global warming?

A
Use of fossil fuel in limit.
B
Increase in forest.
✓
Increasing use of nitrogen fertilizers.
D
Use of other options in the place of $\text{CFC}.$

Answer

Correct option: C.

Increasing use of nitrogen fertilizers.

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MCQ 1071 Mark

If by radiation all nitrogenase enzymes are inactivated, then there will be no:

✓
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

Correct option: A.

Fixation of nitrogen in legumes.

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MCQ 1081 Mark

What will be the effect of addition of organic material on water?

A
$\text{COD}$ remain unaffected
B
$\text{BOD}$ remain unaffected
✓
Increases $\text{BOD}$
D
Reduces $\text{BOD}$

Answer

Correct option: C.

Increases $\text{BOD}$

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MCQ 1091 Mark

One of the causes of water pollution, is excessive use of $...........$ and $..........$ by the farmers:

A
Manure, water
✓
Fertilizers, pesticides
C
Fertilizers, seeds
D
Pesticides, seeds

Answer

Correct option: B.

Fertilizers, pesticides

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MCQ 1101 Mark

If the river water is polluted with domestic sewage and garbage, it leads to the depletion of:

A
$\mathrm{CO}_2$
B
$CO$
✓
$\mathrm{O}_2$
D
All of the above

Answer

Correct option: C.

$\mathrm{O}_2$

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MCQ 1111 Mark

$..........$ is a farming system with minimal or no use of chemicals such as fertilizers, herbicides, pesticides.

A
Subsistence farming
B
Ley farming
✓
Organic farming
D
Industrial farming

Answer

Correct option: C.

Organic farming

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MCQ 1121 Mark

Use of $........$ in agricultural activities has grown quite a lot hazardous ammonia gases in the atmosphere.

A
Insecticides
B
Pesticides
C
Fertilizers
✓
All of the above

Answer

Correct option: D.

All of the above

Use of insecticides, pesticides and fertilizers in agricultural activities has grown quite a lot hazardous ammonia gases in the atmosphere.

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MCQ 1131 Mark

Which of the following is an example of freon?

✓
$\mathrm{CCl}_2 \mathrm{F}_2$
B
$\mathrm{CCl}_4$
C
$\mathrm{CHCl}_2$
D
$\mathrm{CH}_2 \mathrm{Cl}$

Answer

Correct option: A.

$\mathrm{CCl}_2 \mathrm{F}_2$

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MCQ 1141 Mark

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

A
$5.00$ micrometers.
B
$10.00$ micrometers.
✓
$2.50$ micrometers.
D
$7.5$ micrometers.

Answer

Correct option: C.

$2.50$ micrometers.

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MCQ 1151 Mark

If global warming continues, the organism which may face more severe threat is:

A
Cow
B
Lion
✓
Snow leopard
D
Dolphin

Answer

Correct option: C.

Snow leopard

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MCQ 1161 Mark

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

A
Physical.
B
Chemical.
C
Biological.
✓
All of these.

Answer

Correct option: D.

All of these.

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MCQ 1171 Mark

What are the advantages of reforestation?

A
It helps to reduce the concentration of $\mathrm{CO}_2$ in the environment.
B
It has the potential to preserve endangered species.
C
It can reverse the damage done by erosion.
✓
All of the above.

Answer

Correct option: D.

All of the above.

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MCQ 1181 Mark

Radioactive pollution along Kerala coast is due to:

A
Zinc
✓
Thorium
C
Caesium
D
Plutonium

Answer

Correct option: B.

Thorium

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MCQ 1191 Mark

The common refrigerant chlorofluoromethane $($Freon$)$ and $\text{NOx}$ is a serious pollutant because?

A
It destroys haemoglobin.
✓
It disrupts $\mathrm{O}_3$ layer.
C
It lowers atmospheric temperature.
D
It prevents cloud condensation.

Answer

Correct option: B.

It disrupts $\mathrm{O}_3$ layer.

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MCQ 1201 Mark

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

A
Calcium
B
Sulphur
✓
Phosphorus
D
Carbon

Answer

Correct option: C.

Phosphorus

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MCQ 1211 Mark

Carbon monoxide is a pollutant because:

A
It reacts with $\mathrm{O}_2$.
B
It inhibits glycolysis.
✓
It reacts with haemoglobin.
D
It makes nervous system inactive.

Answer

Correct option: C.

It reacts with haemoglobin.

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MCQ 1221 Mark

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.
✓
It increases competition with fishes for dissolved oxygen.

Answer

Correct option: D.

It increases competition with fishes for dissolved oxygen.

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MCQ 1231 Mark

Measurement of the rate of oxygen consumption in unit volume of water over a period of time is done to find out:

A
Biogas generation
✓
Biological oxygen demand
C
Biosynthetic pathways
D
Fermentation

Answer

Correct option: B.

Biological oxygen demand

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MCQ 1241 Mark

Which of the following is one of the major factors that cause water pollution?

A
Burning of fossil fuels.
✓
Dumping of industrial waste.
C
Use of $\text{CFC's}.$
D
None of these

Answer

Correct option: B.

Dumping of industrial waste.

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MCQ 1251 Mark

$\text{BOD}$ of a pond is related to $..........$ in per unit volume of water.

A
All the plants
B
All the nektons
✓
All the microbes
D
All the animals

Answer

Correct option: C.

All the microbes

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MCQ 1261 Mark

Increase in $\text{BOD}$ of water reservoir is due to:

A
Algae
B
Soil
C
Moss
✓
Waste product

Answer

Correct option: D.

Waste product

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MCQ 1271 Mark

The Taj Mahal is threatened due to the effect of:

A
Oxygen.
B
Hydrogen.
C
Chlorine.
✓
Sulphur dioxide.

Answer

Correct option: D.

Sulphur dioxide.

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MCQ 1281 Mark

The measurement of rate of oxygen utilisation by a unit volume of water over a period of time is to measure.

✓
Biochemical oxygen demand
B
Biosynthetic path
C
Biogas generation
D
Fermentation

Answer

Correct option: A.

Biochemical oxygen demand

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MCQ 1291 Mark

In $1984,$ Bhopal gas tragedy was caused due to the leakage of:

A
Potassium isocyanate.
B
Sodium monoxide.
C
Sodium thiocyanate.
✓
Methyl isocyanate.

Answer

Correct option: D.

Methyl isocyanate.

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MCQ 1301 Mark

$\text{BOD}$ is related to:

✓
Organic pollutants
B
Detergents
C
Putrescibility
D
Inorganic pollutants

Answer

Correct option: A.

Organic pollutants

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MCQ 1311 Mark

Gases referred to as 'green house gases' are:

A
$\mathrm{CO}_2, \mathrm{O}_2, \mathrm{NO}_2, \mathrm{NH}_3$
B
Chlorofluoro carbon, $\mathrm{CO}_2, \mathrm{NH}_3, \mathrm{~N}_2$
C
$\mathrm{CH} 4, \mathrm{~N}_2, \mathrm{CO}_2, \mathrm{NH}_3$
✓
Chlorofluoro carbon, $\mathrm{CO}_2, \mathrm{CH}_4, \mathrm{NO}_2$

Answer

Correct option: D.

Chlorofluoro carbon, $\mathrm{CO}_2, \mathrm{CH}_4, \mathrm{NO}_2$

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MCQ 1321 Mark

Ozone in stratosphere extends:

A
$10-20\ km$
✓
$20-25\ km$
C
$15-30\ km$
D
$25-40\ km$

Answer

Correct option: B.

$20-25\ km$

The ozone layer can be traced in the stratosphere. It extends to $20-25 \ km$ away from the surface of the earth. It helps to absorb the ultraviolet radiation.

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MCQ 1331 Mark

Which of the following causes biomagnification?

A
Mercury.
B
$\text{DDT}.$
✓
Both.
D
None of these.

Answer

Correct option: C.

Both.

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MCQ 1341 Mark

A successful forest conservation strategy should involve:

A
Protection of animals at the highest trophic level.
B
Protection of only sonsumers.
C
Protection of only herbivores.
✓
Comprehensive programme to protect all the physical and biological components.

Answer

Correct option: D.

Comprehensive programme to protect all the physical and biological components.

Proper balance of all the abiotic and biotic components is the only way to preserve an ecosystem.

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MCQ 1351 Mark

Why is the concentration of ozone less over the north and south poles?

A
$\text{CFC's}$ accumulate only in area where the air is cold.
B
$\text{CFC}$ use is highest in these areas.
✓
$\text{CFC's}$ stick to frozen water vapour and are able to act as catalysts.
D
$\text{UV}$ rays are stronger in the atmosphere.

Answer

Correct option: C.

$\text{CFC's}$ stick to frozen water vapour and are able to act as catalysts.

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MCQ 1361 Mark

Green$-$house effect is warming due to:

A
Infra$-$red rays reaching earth.
B
Moisture layer in atmosphere.
✓
Increase in temperature due to increase in carbon dioxide concentration of atmosphere.
D
Ozone layer of atmosphere.

Answer

Correct option: C.

Increase in temperature due to increase in carbon dioxide concentration of atmosphere.

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MCQ 1371 Mark

Domestic waste constitutes.

A
Non$-$biodegradable pollution.
✓
Biodegradable pollution.
C
Effluents.
D
Air pollution.

Answer

Correct option: B.

Biodegradable pollution.

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MCQ 1381 Mark

Compressed Natural Gas $\text{(CNG)}$ is:

A
Ethane
B
Butane
✓
Methane
D
Propane

Answer

Correct option: C.

Methane

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MCQ 1391 Mark

Which among the following is a major cause of water pollution?

A
Fly ash
B
Aeroplane
C
Automobile exhaust
✓
Pesticides

Answer

Correct option: D.

Pesticides

Pesticides when sprinkled on crops and plants also get mixed by water in the field and leads to water pollution.

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MCQ 1401 Mark

$\text{DDT}$ causes egg shell thinning in birds because it inhibits.

✓
Calmodulin.
B
Calcium $\text{ATP}$ ase.
C
Magnesium $\text{ATP}$ ase.
D
Carbonic anhydrase.

Answer

Correct option: A.

Calmodulin.

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MCQ 1411 Mark

Eutrophication causes $a/ an:$

A
Decrease in organic matter.
B
Increase in inorganic nutrients.
✓
Decrease in dissolved oxygen.
D
Increase in dissolved oxygen.

Answer

Correct option: C.

Decrease in dissolved oxygen.

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MCQ 1421 Mark

Overall the contribution of carbon dioxide to global warming is:

A
$20\%$
B
$14\%$
C
$6\%$
✓
$60\%$

Answer

Correct option: D.

$60\%$

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MCQ 1431 Mark

Industrial melanism is an example of:

A
Drug resistance.
B
Defensive adaptation of skin against $\text{UV}$ radiations.
✓
Protective resemblance with the surrounding.
D
Darkening of skin due to industries.

Answer

Correct option: C.

Protective resemblance with the surrounding.

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MCQ 1441 Mark

Ozone layer of upper atmosphere is being destroyed by:

A
Sulphurdioxide
B
Carbondioxide
✓
Chlorofluorocarbon
D
Smog

Answer

Correct option: C.

Chlorofluorocarbon

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MCQ 1451 Mark

Bio$-$indicators are used for:

A
Oxygen demand
B
Air pollution
C
Mineral present
✓
All of the above

Answer

Correct option: D.

All of the above

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MCQ 1461 Mark

Excess of carbon dioxide in the atmosphere leads to:

✓
Global warming
B
Ozone depletion
C
Acid rain
D
None of the above

Answer

Correct option: A.

Global warming

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MCQ 1471 Mark

Algal blooms impart a distinct colour to water due to:

✓
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

Correct option: A.

Their pigments.

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MCQ 1481 Mark

$.........$ shields the surface of the earth from ultraviolet $\text{(UV)}$ radiation from the sun.

A
Oxygen
B
Nitrogen
✓
Ozone
D
Carbon dioxide

Answer

Correct option: C.

Ozone

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MCQ 1491 Mark

The worst environmental hazards were created by accidents in nuclear power plant and $\text{MIC}$ gas tragedy respectively in:

A
Russia in $1990$ and Bhopal in $1986.$
B
Ukrain in $1988$ and $\text{USA}$ in $1984.$
C
Bhopal in $1984$ and Russia in $1990.$
✓
Ukrain in $1986$ and Bhopal in $1984.$

Answer

Correct option: D.

Ukrain in $1986$ and Bhopal in $1984.$

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MCQ 1501 Mark

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

A
Jaundice.
B
Cholera.
C
Typhoid.
✓
Hepatitis$-B.$

Answer

Correct option: D.

Hepatitis$-B.$

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Biology M.C.Q (1 Marks)