Environmental Issues Test

Result

Environmental Issues Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Increasing skin cancer and high mutation rate are due to

A
Ozone depletion

B
Acid rain

C
CO₂ pollution

D
CO pollution

Solution

Increasing skin cancer and high mutation rate are due to ozone layer depletion. Ozone layer protects us from harmful effect of UV rays that may cause skin cancer and mutation in organisms.
Question 2
1 / -0

Aerosols decrease primary productivity by

A
Competing with CO₂

B
Preventing N₂ fixation.

C
Reducing photosynthesis.

D
Decreasing O₂ concentration.

Solution

Aerosols decrease primary productivity by reducing rate of photosynthesis of autotrophic organisms, which are primary producer of ecosystem of any kind of habitat.
Question 3
1 / -0

Highest DDT deposition shall occur in

A
Phytoplankton

B
Eel

C
Crab

D
Sea bird

Solution

Deposition of non-biodegradable substances increase with trophic levels. The organisms at lower trophic level have lost concentration of DDT. Eel occupies the highest position in food chain and have highest DDT deposition.
Question 4
1 / -0

A lake receiving nutrients would be

A
Rich in fossils

B
Sink

C
Eutrophic

D
Oligotrophic

Solution

A lake receiving nutrients would be eutrophic. This nutrient accumulates in lake water and cause eutrophication. It will become difficult for other organism to survive in such kinds of water.
Question 5
1 / -0

Fertilizers added to fresh water will cause

A
Decrease in fish population

B
Death of plants

C
Increase in aquatic animals

D
Eutrophication

Solution

Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both.

Human activities can accelerate the rate at which nutrients enter ecosystems.

Fertilizers added to fresh water increase the nutrients that cause growth of large number of microbes in water that leads to eutrophication.
Question 6
1 / -0

Drawback of DDT s pesticide is

A
It is less effective than others

B
It become less ineffective after some time

C
Its high cost

D
It is not easily or rapidly degraded in nature.

Solution

The main drawback of DDT as pesticide is that, it is not easily and rapidly degraded in nature and passes to water bodies along with water, where magnify at successive trophic level of food chain.
Question 7
1 / -0

In coming years, skin related disorders will become more common due to

A
Excessive use of detergents

B
Depletion of ozone layer.

C
Air pollution

D
Water pollution

Solution

In coming years, skin related disorders will become more common due to depletion of ozone layer. UV rays released from Sun is prevented by ozone layer that is responsible for skin related disease.
Question 8
1 / -0

Use of Lichen in case of pollution is

A
Treatment of pollutant water.

B
Promote pollution

C
Bio-indicator of pollution.

D
Lichen have no relation with pollution.

Solution

Lichens are symbiotic association between algae and fungi. Lichens can be used to detect the pollution level as they do not grow in polluted areas.
Question 9
1 / -0

Correct increased order of concentration of DDT in following organisms are
i. Small fish
ii. Large fish
iii. Phytoplankton
iv. Human beings

A
iii, i, ii and iv.

B
iv, ii, i, and iii.

C
i, ii, iii and iv.

D
ii, iii, iv, and i

Solution

The concentration of DDT increase with increase in trophic levels. Phytoplankton being producer have minimum concentration of DDT. Human being consume large number of fish so, concentration will be maximum due to biomagnifications.
Question 10
1 / -0

Assertion: Agricultural output increased several times after introduction of DDT.
Reason: DDT was the first insecticide used on a wide scale.

A
Assertion is true but reason is wrong.

B
Both are true but reason is reason is not correct explanation.

C
Assertion is wrong but reason is true.

D
Both are wrong.

Solution

Agricultural output increased several times after introduction of DDT along with better quality of seeds, use of fertilizers and modern agricultural technique.

DDT was the first insecticide used on a wide scale.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 8

Result

Environmental Issues Test - 8

Score

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Rank

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SHARING IS CARING

Question 1

Ozone depletion

Acid rain

CO2 pollution

CO pollution

Solution

Question 2

Competing with CO2

Preventing N2 fixation.

Reducing photosynthesis.

Decreasing O2 concentration.

Solution

Question 3

Phytoplankton

Eel

Crab

Sea bird

Solution

Question 4

Rich in fossils

Sink

Eutrophic

Oligotrophic

Solution

Question 5

Decrease in fish population

Death of plants

Increase in aquatic animals

Eutrophication

Solution

Question 6

It is less effective than others

It become less ineffective after some time

Its high cost

It is not easily or rapidly degraded in nature.

Solution

Question 7

Excessive use of detergents

Depletion of ozone layer.

Air pollution

Water pollution

Solution

Question 8

Treatment of pollutant water.

Promote pollution

Bio-indicator of pollution.

Lichen have no relation with pollution.

Solution

Question 9

iii, i, ii and iv.

iv, ii, i, and iii.

i, ii, iii and iv.

ii, iii, iv, and i

Solution

Question 10

Assertion is true but reason is wrong.

Both are true but reason is reason is not correct explanation.

Assertion is wrong but reason is true.

Both are wrong.

Solution

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CO₂ pollution

Competing with CO₂

Preventing N₂ fixation.

Decreasing O₂ concentration.