UPSC GS PRELIMS 2013 ENVIRONMENT QUESTIONS

1 . Which of the following can be found as pollutants in the drinking water in some parts of India?

1 . Arsenic
2 . Sorbitol
3 . Fluoride
4 . Formaldehyde
5 . Uranium
Select the correct answer using the codes given below.

(a) 1 and 3 only

(b) 2, 4 and 5 only

(c) 1, 3 and 5 only

(d) 1, 2, 3, 4 and 5

Solution (c)

2 . In the grasslands, trees do not replace the grasses as a part of an ecological succession because of :

(a) insects and fungi

(b) limited sunlight and paucity of nutrients

(c) water limits and fire

(d) None of the above

Solution (c)

3 . Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?

(a) Oceans, lakes, grasslands, mangroves

(b) Mangroves, oceans, grasslands, lakes

(c) Mangroves, grasslands, lakes, oceans

(d) Oceans, mangroves, lakes, grasslands

Solution (c)

4 . Acid rain is caused by the pollution of environment by

(a) carbon dioxide and nitrogen

(b) carbon monoxide and carbon dioxide

(c) ozone and carbon dioxide

(d) nitrous oxide and sulphur dioxide

Solution (d)

5 . With reference to food chains in ecosystems, consider the following statements :

1 . A food chain illustrates the order in which a chain of organisms feed upon each other.
2 . Food chains are found within the populations of a species.
3 . A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statements given above is / are correct?

(a) 1 only

(b) 1 and 2 only

(c) 1, 2 and 3

(d) None

Solution (a)

6 . Consider the following organisms:

1 . Agaricus
2 . Nostoc
3 . Spirogyra
Which of the above is / are used as biofertilizer / biofertilizers

(a) 1 and 2

(b) 2 only

(e) 2 and 3

(d) 3 only

Solution (b)

7 . Which one of the following terms describes not only the physical space occupied by an organism, but also its functional role in the community of organisms?

(a) Ecotone

(b) Ecological niche

(c) Habitat

(d) Home range

Solution (b)

8 . Photochemical smog is a resultant of the reaction among:

(a) NO2, 03 and peroxyacetyl nitrate in the presence of sunlight

(b) CO, 02 and peroxyacetyl nitrate in the presence of sunlight

(c) CO, CO2 and N02 at low temperature

(d) High concentration of N02, O3 and CO in the evening

Solution (a)

9 . With reference to the food chains in ecosystems, which of the following kinds of organism is / are known as decomposer organism/organisms?

1 . Virus
2 . Fungi
3 . Bacteria
Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Solution (b)

10. Due to improper/indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?
1 . Beryllium
2 . Cadmium
3 . Chromium
4 . Heptachlor
5 . Mercury
6 . Lead
7 . Plutonium
Select the correct answer using the codes given below.

(a) 1, 3, 4, 6 and 7 only
(b) 1, 2, 3, 5 and 6 only
(c) 2, 4, 5 and 7 only
(d) 1, 2, 3, 4, 5, 6 and 7

Solution (b)

11 . With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct?
1 . Bagasse can be used as biomass fuel for the generation of energy.
2 . Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.
3 . Molasses can be used for the production of ethanol.
Select the correct answer using the codes given below.

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution (c)

12 . Contour bunding is a method of soil conservation used in
(a) desert margins, liable to strong wind action
(b) low flat plains, close to stream courses, liable to flooding
(c) scrublands, liable to spread of weed growth
(d) none of the above

Solution (d)

13 . Which of the following adds/add nitrogen to the soil?
1 . Excretion of urea by animals
2 . Burning of coal by man
3 . Death of vegetation
Select the correct answer using the codes given below.

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution (c)

14 . Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to

1 . resist drought and increase absorptive area
2 . tolerate extremes of pH
3 . resist disease infestation
Select the correct answer using the codes given below:

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution (d)

15 . Consider the following animals:
1 . Sea cow
2 . Sea horse
3 . Sea lion
Which of the above is/are mammal/mammals?

(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3

Solution (b)

16 . Consider the following
1 . Star tortoise
2 . Monitor lizard
3 . Pygmy hog
4 . Spider monkey
Which of the above found in India?

(a) 1, 2 and 3 only
(b) 2 and 3 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4

Solution (a)

17 . Consider the following fauna of India:
1 . Gharial
2 . Leatherback turtle
3 . Swamp deer
Which of the above is/are endangered?

(a) 1 and 2 only
(b) 3 only
(c) 1, 2 and 3
(d) None

Solution (a)

18 . Which of the following is/are unique characteristic/characteristics of equatorial forests?
1 . Presence of tall, closely set trees with crowns forming a continuous canopy
2 . Coexistence of a large number of species
3 . Presence of numerous varieties of epiphytes
Select the correct answer using the code given below:

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Solution (d)

19 . In which of the following States is lion-tailed macaque found in its natural habitat?
1 . Tamil Nadu
2 . Kerala
3 . Karnataka
4 . Andhra Pradesh
Select the correct answer using the codes given below.

(a) 1, 2 and 3 only
(b) 2 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4

Solution (a)

20 . Consider the following pairs about parks and rivers passing through them:
1 . Corbett National Park: Ganga
2 . Kaziranga National Park: Manas
3 . Silent Valley National Park: Kaveri
Which of the above pairs is/are correctly matched?

(a) 1 and 2
(b) 3 only
(c) 1 and 3
(d) None

Solution (d)

21. Consider the following pairs:
1 . Nokrek Bio-sphere Reserve: Garo Hills
2 . Logtak (Loktak) Lake : Barail Range
3 . Namdapha National Park : Dafla Hills
Which of the above pairs is/are correctly matched?

(a) 1 only
(b) 2 and 3 only
(c) 1, 2 and 3
(d) None

Solution (a)