Environmental Issues Test

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Environmental Issues Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called as

A
Ley farming

B
Contour farming

C
Strip farming

D
Shifting agriculture
Solution
- Farming of legumes/grasses and other crops in alternation to improve the soil fertility is called as ley farming. Legumes add nitrogenous compounds to soil and thereby help the soil to resume the lost minerals. This makes option A correct.
- The farming in row patterns that run nearly level around the hill is called as contour farming. Option B is incorrect.
- Option C is incorrect as strip farming includes dividing the whole field in strips and cultivation in alternate strips to ensure soil fertility.
- Option D is incorrect as shifting agriculture includes farming in one field and then leaving it for natural vegetation by cultivating in some other field.
  Hence, correct answer is A.
Question 2
1 / -0

Global warming can be controlled by

A
Reducing deforestation, cutting down use of fossil fuel

B
Reducing reforestation, increasing the use of fossil fuel

C
Increasing deforestation, slowing down the growth of human population

D
Increasing deforestation, reducing efficiency of energy usage

Solution

Deforestation is a contributor to global warming and is often cited as one of the major causes of the enhanced greenhouse effect. Tropical deforestation is responsible for approximately 20% of world greenhouse gas emissions. Burning fossil fuels increases the amount of carbon dioxide (CO$$_{2}$$) in the atmosphere. CO$$_{2}$$ is a major contributor to climate change or global warming.
Question 3
1 / -0

Depletion of which gas in the atmosphere can lead to an increase incidence of skin cancers?

A
Nitrous oxide

B
Ozone

C
Ammonia

D
Methane

Solution

The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere.
Excessive exposure can also cause cataracts, immune system suppression, and genetic damage, resulting in problems such as skin cancer.
Question 4
1 / -0

When domestic sewage mixes with river water

A
The river water is still suitable for drinking as impurities are only about 0.1%.

B
Small animals like rats will die after drinking river water.

C
The increased microbial activity releases micronutrients such as iron.

D
The increased microbial activity uses up dissolved oxygen.

Solution

When domestic sewage mixes with river water, the microbes present in water starts to degrade it and increased microbial activity increases the biological oxygen demand of the water and so as the percentage of dissolved oxygen decreases it leads to the death of aquatic life.
So, the correct answer is option D.
Question 5
1 / -0

Consider the following statements (A - D) about organic farming.
(A) Utilizes genetically modified crops like Bt cotton.
(B) Uses only naturally produced inputs like compost.
(C) Does not use pesticides and urea.
(D) Produces vegetables rich in vitamins and minerals.
Which of the above statements are correct?

A
(B), (C) and (D)

B
(C) and (D) only

C
(B) and (C) only

D
(A) and (B) only

Solution

In organic farming, farmers use natural manures, compost, and bio-fertilizers, instead of using chemical fertilizers. Some useful microbes used as bio-fertilizers are bacteria, algae, and fungi. Genetically modified plants are plants which have desirable characters such as resistance to pest, insects, droughts, and salinity organic farming involves the use of natural wild-type plants. Organic farming used to increase agricultural productivity, and maintain sustainable soil productivity, but not to produce particularly vegetables rich in vitamins and minerals. Thus, the correct answer is option C.
Question 6
1 / -0

Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

A
Petroleum industry

B
Sugar industry

C
Domestic sewage

D
Dairy industry
Solution
A) Correct option is (A)
B) Explanation for correct option (A)
BOD is increased by dumping off waste rich in phosphates and nitrogen compounds as these two favour algal growth causing algal bloom and death of other underwater plants due to lack of Sunlight.
The presence of excess organic matter favours microbial growth and reduces available dissolved oxygen.
Petroleum industry waste is rich in radium-based toxic substances that do not favour algal and plankton growth and have no effect on BOD.
Question 7
1 / -0

High value of BOD (Biochemical Oxygen Demand) indicates

A
Water is less polluted

B
Consumption of organic matter in the water is higher by the microbes

C
Water is pure

D
None of these

Solution

A.Correct option -B

B.Explanation for correct option -B
●Biochemical Oxygen Demand /Biological Oxygen Demand is a measurement of the amount of dissolved oxygen that is used by aerobic microorganisms while decomposing organic matter in water.
●A high BOD indicates two things which are -
a. High level of microorganisms in the water.
b. High content of organic material in the water that is broken down by the organisms.
●It is an indication of organic pollution.
Question 8
1 / -0

World ozone day is celebrated on __________

A
$$16^{th}$$ September

B
$$5^{th}$$ June

C
$$22^{nd}$$ April

D
$$21^{st}$$ April
Solution
1. 16$$^{th}$$ september is celebrated as world ozone day
2. 5$$^{th}$$ June is celebrated as world environment day.
3. 22$$^{nd}$$ april is celebrated as Earth day.
4. 21$$^{st}$$ april is celebrated as civil services day.
So, the correct answer is option A.
Question 9
1 / -0

A lake with an inflow of domestic sewage rich in organic waste may result in:

A
Drying of the lake very soon due to algal bloom.

B
An increased production of fish due to lot of nutrients.

C
Death of fish due to lack of oxygen.

D
Increased population of aquatic food web organisms.

Solution

Domestic sewage leads to organic loading or occurrence of excess organic matter inside water. Its putrefaction decreases dissolved oxygen. Blue green algae present in the bloom also release toxins. Both toxicity and decreased oxygen level kill aquatic animals. Anaerobic putrefaction produces pollutants like methane, hydrogen sulphide, and ammonia. They kill the bloom forming plants as well. The water body comes to have foul smell, brown colouration, bad taste and oil.
Question 10
1 / -0

Biological Oxygen Demand (BOD) is a measure of

A
Industrial wastes poured into water bodies

B
Extent to which water is polluted with organic compound

C
Amount of carbon monoxide inseparably combined with haemoglobin

D
Amount of oxygen needed by green plants during night

Solution

Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. It is used as a measure of the degree of water pollution.
Therefore, the correct answer is option B.

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Re-Attempt Weekly Quiz Competition

Environmental Issues Test - 17

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Environmental Issues Test - 17

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SHARING IS CARING

Question 1

Ley farming

Contour farming

Strip farming

Shifting agriculture

Solution

Question 2

Reducing deforestation, cutting down use of fossil fuel

Reducing reforestation, increasing the use of fossil fuel

Increasing deforestation, slowing down the growth of human population

Increasing deforestation, reducing efficiency of energy usage

Solution

Question 3

Nitrous oxide

Ozone

Ammonia

Methane

Solution

Question 4

The river water is still suitable for drinking as impurities are only about 0.1%.

Small animals like rats will die after drinking river water.

The increased microbial activity releases micronutrients such as iron.

The increased microbial activity uses up dissolved oxygen.

Solution

Question 5

(B), (C) and (D)

(C) and (D) only

(B) and (C) only

(A) and (B) only

Solution

Question 6

Petroleum industry

Sugar industry

Domestic sewage

Dairy industry

Solution

Question 7

Water is less polluted

Consumption of organic matter in the water is higher by the microbes

Water is pure

None of these

Solution

Question 8

$$16^{th}$$ September

$$5^{th}$$ June

$$22^{nd}$$ April

$$21^{st}$$ April

Solution

Question 9

Drying of the lake very soon due to algal bloom.

An increased production of fish due to lot of nutrients.

Death of fish due to lack of oxygen.

Increased population of aquatic food web organisms.

Solution

Question 10

Industrial wastes poured into water bodies

Extent to which water is polluted with organic compound

Amount of carbon monoxide inseparably combined with haemoglobin

Amount of oxygen needed by green plants during night

Solution

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