Environmental Issues Test

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Environmental Issues Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

Bio-indicators are used for

A
Oxygen demand

B
Air pollution

C
Mineral present

D
All of the above

Solution

Bioindicators are organisms, which have a special requirement for some specific mineral or abiotic factor or show some specific response to a particular abiotic factor. Thus, they are good indicators of environmental health. Oxygen demand, presence of minerals, occurrence of petroleum products, radioactive minerals and pollution etc. are some of the responses that can be detected using bioindicators. Lichens are very sensitive to air pollution specially due to sulphur oxides and do not grow in areas having high sulphur dioxide pollution. It is a very commonly used bio-indicator.
Question 2
1 / -0

The BOD of an eutrophied lake will be

A
Higher

B
Lower

C
Moderate

D
Same as any other lake

Solution

Part of fertilizers added to crop fields are passed down to water bodies during rains through surface run off. Presence of extra nutrients brings about dense growth of plant and animal life. The phenomenon is called as eutrophication. Eutrophication leads to organic loading, depletion of oxygen that leads to the death of animals, fouling of water and an increase in biological oxygen demand or BOD.
Question 3
1 / -0

Calcium metabolism in birds gets disturbed due to the effect of

A
Mercury

B
Cadmium

C
DDT

D
Lead

E
Copper
Question 4
1 / -0

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

A
COD remain unaffected

B
BOD remain unaffected

C
Increases BOD

D
Reduces BOD

Solution

Decomposition of organic matter by microbes requires oxygen. Degree of organic impurity of water is measured in terms of 'Biological Oxygen Demand' or BOD. BOD is the oxygen in milligrams required by microorganisms to metabolise organic wastes. When more organic matter are added to water, the BOD of the water will increase.
Question 5
1 / -0

DDT concentration in the human body is

A
0.3-0.7 ppm

B
1.3-3.1 ppm

C
13-31 ppm

D
30-70 ppm

Solution

In India as a result of prolonged use of DDT 13-31 ppm of DDT can be detected in the body fat of the people.
Question 6
1 / -0

DDT is a

A
Organochlorine

B
Organophosphate

C
Carbamate

D
Triazine
Question 7
1 / -0

Measuring 'Biochemical Oxygen Demand' is used for

A
Estimating the amount of organic matter in sewage water.

B
Working out the efficiency of oil driven automobile engines.

C
Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale.

D
Working out the efficiency of R.B.Cs. about their capacity to carry oxygen.

Solution

Degree of pollution or impurities in water due to organic matter is measured in terms of 'Biological Oxygen Demand' or BOD. Biological oxygen demand or BOD is the oxygen in milligrams required for five days in one litre of water at 20 degree centigrades for the microorganisms to metabolise organic waste.
Low pollution level is indicated by below 1500 mg/lit, medium pollution level is indicated by 1500 to 4000 mg/lit and high organic pollution level is indicated by above 4000 mg/lit.
Question 8
1 / -0

Concentration of insecticide in the animals of a species is known as ____

A
Eutrophication

B
Bioconcentration

C
Bioindicator

D
None of the above

Solution

Bioconcentration is the process of ingestion and retention of the chemical substance in an organism. It mainly occurs in the aquatic organism by the exposure to waterborne chemicals.
Correct answer is option B.
Question 9
1 / -0

The most famous pesticide of the world is

A
Methyl isocyanate

B
DDT

C
Gammexane

D
Malathion
Question 10
1 / -0

If we remove half of the forest cover of earth, what kind of crisis will occur?

A
Many species would become extinct.

B
Population, pollution and ecological imbalance will rise.

C
Energy crisis will commence.

D
The remaining forest will cause imbalance.

Solution

Forests occupy more than 30 percent of Earth's land surface and account for 50 percent of plant productivity. Therefore 45% of the carbon stored on land is tied up in forests. Further, these being the dominant terrestrial ecosystem, the forest account for 75% of the gross primary productivity of the Earth's biosphere and 80% of the plant biomass. Removing half the forest cover, will not only bring in an increase in the population of human beings and other living organisms but will also bring about increased pollution and a great ecological imbalance.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 26

Result

Environmental Issues Test - 26

Score

-

Rank

-

SHARING IS CARING

Question 1

Oxygen demand

Air pollution

Mineral present

All of the above

Solution

Question 2

Higher

Lower

Moderate

Same as any other lake

Solution

Question 3

Mercury

Cadmium

DDT

Lead

Copper

Question 4

COD remain unaffected

BOD remain unaffected

Increases BOD

Reduces BOD

Solution

Question 5

0.3-0.7 ppm

1.3-3.1 ppm

13-31 ppm

30-70 ppm

Solution

Question 6

Organochlorine

Organophosphate

Carbamate

Triazine

Question 7

Estimating the amount of organic matter in sewage water.

Working out the efficiency of oil driven automobile engines.

Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale.

Working out the efficiency of R.B.Cs. about their capacity to carry oxygen.

Solution

Question 8

Eutrophication

Bioconcentration

Bioindicator

None of the above

Solution

Question 9

Methyl isocyanate

DDT

Gammexane

Malathion

Question 10

Many species would become extinct.

Population, pollution and ecological imbalance will rise.

Energy crisis will commence.

The remaining forest will cause imbalance.

Solution

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