Environmental Issues Test

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Environmental Issues Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

Identify the incorrect statement among the following statements on the effects of deforestation.

A
It destroys the natural habitat of wild animals.

B
It alters the local weather patterns.

C
It speeds up nutrient recycling.

D
It leads to soil erosion.

Solution

Deforestation means the cutting of forests and making them into the land. This leads to the destroy of shelter and food source to the wild animals that live in that forests. It also alters the climatic conditions by increasing the earth temperature and decreased rainfall. As the trees are cut down the underlying soil will also lead to soil erosion.
The nutrients recycling between the tress and soil will be destroyed thus making the soil unfertilized .
hence, the correct option is C.
Question 2
1 / -0

Choose the wrong pair

A
Salvodora - Desert

B
Cenchrus - Savanna

C
Ables - Coniferous forest

D
Quercus - Broad leaf forest

E
Tectona - Temperate forest

Solution

Tectona is commonly called teak tree. it is common in tropical deciduous forests along with Butea, Bombax, Shorea (Sal), Acacia (khair) etc.
In India, tropical deciduous forests occur in both plains and low hilly areas of North as well as South India.
Hence the correct answer is (E)
Question 3
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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) It does not use pesticides and urea.
(D) Produces vegetables rich in vitamins and minerals.
Which of the above statements are correct?

A
(B) and (C) only

B
(A) and (B) only

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

D
(C) and (D) only

Solution

A- Organic farming is the method of cultivation of crops through use of fertilizers of organic origin such as green manure, compost, bonemeal etc. It uses techniques such as crop rotation and companion plantation. Synthetic fertilizers and pesticides are strictly prohibited.
So, the correct answer is '(B) and (C) only'
Question 4
1 / -0

In recent years, there has been an increasing incidence of floods in the plains of northern India because

A
There has been an increase in annual rainfall

B
The rate of silting of darns has gone up

C
There has been increased deforestation in the catchment areas

D
Increased areas of land is being self cultivated
Question 5
1 / -0

What is the main cause for the extinction of some species in tropical forest?

A
Deforestation

B
Afforestation

C
Pollution

D
Soil erosion

Solution

Deforestation is the depletion of forest resources. It's main cause is the explosion of human and livestock population with the increased demand requirements of the basic needs. The major effect of deforestation is the loss of precious wild life, rare species of flora and fauna. Directly or indirectly, deforestation caused intensified soil erosion, accentuated floods, drought and the worst pollution.
So, the correct answer is 'Deforestation'.
Question 6
1 / -0

Assertion :UV - rays are carcinogenic in nature.
Reason : UV - rays rupture DNA strands and induce mutations to cause cancers.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If assertion is true but reason is false.

D
If the assertion and reason both are false.

E
If assertion is false but reason is true.
Question 7
1 / -0

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

A
Siltation of dams

B
Rainfall

C
Agriculture

D
Deforestation in catchment area

Solution

Floods are common in north India because of excessive deforestation in the catchment areas. Roots of the trees keep the soil together and drain the extra water into the underground water reservoir. Due to deforestation (cutting down of the trees), the soil is no longer able to hold or drain the excess water thus leading to floods.
Question 8
1 / -0

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters, is -

A
< 3.0 ppm

B
<10 ppm

C
< 100 ppm

D
< 30 ppm

Solution

BOD is Biological oxygen demand. It is the total amount of oxygen required by the microorganisms present in a water body to break down the organic matter. If BOD is more, it means that there is abundance of microorganisms in that water body and hence it is polluted with organic matter.
Water with BOD level 1 - 2 ppm is considered to be good water, if the BOD is 3 - 9, then the water is considered to be slightly polluted, and if the water has BOD more than 100 ppm, then the water is greatly polluted.
The Central Pollution Control Board has prescribed the limit of BOD for the discharge of industrial and municipal waste in order to regulate the water pollution and for efficient water treatment, and it is <10 ppm.
Question 9
1 / -0

Relative Biological Effectiveness (RBE) usually refers to the damages caused by

A
High temperature

B
Pollution

C
Radiation

D
Low temperature

Solution

Relative Biological Effectiveness (RBE) allows comparison of a test radiation with a standard radiation. It is the ratio of dose between the radiations to give a certain biological effect, for instance a grade of skin reaction or death of mice.
So the answer is 'Radiation'.
Question 10
1 / -0

Many wild animals have either become extinct or are endangered mainly due to

A
Scarcity of food

B
Over crowding

C
Hunting

D
Deforestation

Solution

An endangered species is the species whose population faces a sudden downfall. In the case of wild animals, their habitat is the forest and deforestation of the forests due to ecological disasters, or use of timber for the construction of buildings makes them insecure in their homestead.
Moving away to nearby locations not only disturbs the food chain, breeding grounds and habitats of these wild animals but they are also faced with threats of being hunted and poached for the benefit of the human beings.
So, the correct answer is 'Deforestation'

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Environmental Issues Test - 27

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Environmental Issues Test - 27

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SHARING IS CARING

Question 1

It destroys the natural habitat of wild animals.

It alters the local weather patterns.

It speeds up nutrient recycling.

It leads to soil erosion.

Solution

Question 2

Salvodora - Desert

Cenchrus - Savanna

Ables - Coniferous forest

Quercus - Broad leaf forest

Tectona - Temperate forest

Solution

Question 3

(B) and (C) only

(A) and (B) only

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

(C) and (D) only

Solution

Question 4

There has been an increase in annual rainfall

The rate of silting of darns has gone up

There has been increased deforestation in the catchment areas

Increased areas of land is being self cultivated

Question 5

Deforestation

Afforestation

Pollution

Soil erosion

Solution

Question 6

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true but reason is false.

If the assertion and reason both are false.

If assertion is false but reason is true.

Question 7

Siltation of dams

Rainfall

Agriculture

Deforestation in catchment area

Solution

Question 8

< 3.0 ppm

<10 ppm

< 100 ppm

< 30 ppm

Solution

Question 9

High temperature

Pollution

Radiation

Low temperature

Solution

Question 10

Scarcity of food

Over crowding

Hunting

Deforestation

Solution

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