Environmental Issues Test

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Environmental Issues Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the consequence of deforestation?

A
Global warming

B
Erosion of the top layer of soil

C
Increase in the level of carbon dioxide in air

D
All of the above

Solution

Deforestation is the process of removal or the cutting down of the trees. The absence of the trees results in an increase in the concentration of carbon dioxide which causes global warming. The roots of the plants help in holding the soil and deforestation causes soil erosion from the upper layer of the soil. The plants take up the carbon dioxide from the air for photosynthesis. When there are no trees, there is increase in the level of carbon dioxide.
Thus, the correct answer is option D.
Question 2
1 / -0

If there is no $$CO_2$$ in the atmosphere, what would happen to the earth's temperature?

A
It would, be less than the present.

B
It would,be the same as present.

C
It would be higher than the present.

D
It depends on the $$0_2$$ content of air.

Solution

When carbon dioxide and other air pollutants are collected in the atmosphere they absorb sunlight that has bounced from the earth’s surface. This leads to an increase in the earth's average surface temperature and is called global warming. When there is no carbon dioxide in the atmosphere, the temperature of the Earth's surface will be less than the present temperature.
Thus, the correct answer is option A.
Question 3
1 / -0

Identify the harmful radiations emitted by the sun.

A
Ultra violet

B
Infra red

C
Visible

D
Radio waves

Solution

The ultraviolet radiations are the harmful rays which are present in the sun rays. The radiations are emitted from the sun and are harmful to living organisms. The ozone layer prevents the entry of these radiations into the Earth's atmosphere. The depletion of the ozone layer allows the radiations to cause harm to the plants and animals on the Earth.
Thus, the correct answer is option A.
Question 4
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Which of the following is an effect of deforestation?

A
Water pollution

B
Greenhouse effect

C
Outbreak of diseases

D
Extinction of aquatic life

Solution

If deforestation is performed, there will be no trees so, the amount of the greenhouse gasses will increase in the atmosphere. These greenhouse gasses trap heat from the infrared radiation in the atmosphere and increases the atmosphere's temperature i.e, global warming.
Thus, the correct answer is option B.
Question 5
1 / -0

Ozone in the stratosphere is depleted by

A
$$C_6F_6Cl_6$$

B
$$C_7F_{16}$$

C
$$CF_2Cl_2$$

D
$$C_6F_6$$
Solution
Correct answer: C
Explanation:
- The presence of CFCs in the atmosphere results in the depletion of the ozone layer. The chemical formula of this substance is CF$$_2$$Cl$$_2$$.
- They are used as coolants in refrigerators, coolers, etc.
- The CFCs causes the breaking of the ozone molecule which forms the oxygen radical and O$$_2$$.
- The depletion of the ozone layer results in the penetration of harmful UV radiation from the sun into the Earth's atmosphere.
Question 6
1 / -0

Crop rotation is an important part of organic farming. Why is monocropping problematic?

A
The crop is vulnerable to organized crop thieves

B
It encourages the buildup of diseases and pests that destroy that particular crop

C
It does not use minerals

D
It is expensive

Solution

Crop rotation is a pattern of growing different types of crops in the same area. This method helps in the replenishment of nutrients by the regular succession of crops over the same field and enhances the health of crops. It minimises the amount of pest and increases crop production.
Monocropping is the method in which the same crop is planted on the same land area every year. Hence the plants become weak in progeny every following year. This increases the buildup of diseases. The pests destroy the crops as they have the information of the crop. Thus the correct answer is option B.
Question 7
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Which of the following would happen in the absence of greenhouse effect in the atmosphere?

A
Pollution will increase.

B
The earth's surface temperature will decrease.

C
The earth's surface temperature remains the same.

D
The depleted ozone layer will increase the earth's temperature.

Solution

When carbon dioxide and other air pollutants are collected in the atmosphere they absorb sunlight that has bounced from the earth’s surface. This leads to an increase in the earth's average surface temperature and is called global warming. When there is no effect of the global warming, the temperature of the Earth's surface will decrease.
Thus, the correct answer is option B.
Question 8
1 / -0

Crop rotation is an important part of organic farming. Why is monocropping problematic?

A
The crop is vulnerable to organized crop thieves.

B
It encourages the build-up of diseases and pests that destroy that particular crop.

C
It does not use minerals.

D
It is expensive.

Solution

Monocropping is problematic as it encourages the buildup of diseases and pests that destroy that particular crop. It decreases the total land productivity. In monocropping, the farmer is dependent on a single crop so the risk of crop failure increases which leads to economical loss.
So, the correct answer is option B.
Question 9
1 / -0

Which of the following chemical cause the thinning of layer P?

A
Carbon monoxide

B
Sulphur dioxide

C
Chlorofluorocarbons

D
Both A and C

Solution

Chlorofluorocarbon (CFC) is composed of carbon, fluorine, and chlorine. CFCs are also called freons. CFCs, once released into the atmosphere, accumulate in the stratosphere, where they react with ozone ($$O_3$$) and contribute to the depletion of the ozone layer by breaking the O$$_3$$ into O$$_2$$ and free oxygen. Stratospheric ozone shields life on earth from the harmful effects of the sun's ultraviolet radiation; even a relatively small decrease in the stratospheric ozone concentration can result in an increased incidence of skin cancer in humans and genetic damage in many organisms.
Question 10
1 / -0

Which of the following are the adverse effects of deforestation?

A
Reduced rainfall

B
Soil erosion

C
Destruction of habitat

D
All of these

Solution

Deforestation is removal, decrease or deterioration of forest cover of an area. It causes shrinkage of fuelwood, reduced timber supply, change in climate, flash floods, soil erosion, siltation, cyclones, drought, desertification, reduced rainfall and destruction of habitat. Thus, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 47

Result

Environmental Issues Test - 47

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SHARING IS CARING

Question 1

Global warming

Erosion of the top layer of soil

Increase in the level of carbon dioxide in air

All of the above

Solution

Question 2

It would, be less than the present.

It would,be the same as present.

It would be higher than the present.

It depends on the $$0_2$$ content of air.

Solution

Question 3

Ultra violet

Infra red

Visible

Radio waves

Solution

Question 4

Water pollution

Greenhouse effect

Outbreak of diseases

Extinction of aquatic life

Solution

Question 5

$$C_6F_6Cl_6$$

$$C_7F_{16}$$

$$CF_2Cl_2$$

$$C_6F_6$$

Solution

Question 6

The crop is vulnerable to organized crop thieves

It encourages the buildup of diseases and pests that destroy that particular crop

It does not use minerals

It is expensive

Solution

Question 7

Pollution will increase.

The earth's surface temperature will decrease.

The earth's surface temperature remains the same.

The depleted ozone layer will increase the earth's temperature.

Solution

Question 8

The crop is vulnerable to organized crop thieves.

It encourages the build-up of diseases and pests that destroy that particular crop.

It does not use minerals.

It is expensive.

Solution

Question 9

Carbon monoxide

Sulphur dioxide

Chlorofluorocarbons

Both A and C

Solution

Question 10

Reduced rainfall

Soil erosion

Destruction of habitat

All of these

Solution

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