Environmental Studies Questions and Answers - Set 25 | Environmental Studies Quiz GkSeries

Questions

1 Mixing height during night is typically in the range

1 < few hundred metres

2 1 km – 2 km

3 2 km – 3 km

4 2 km – 3 km (4) 3 km – 4 km

Answer: < few hundred metres

2 At a given urban location, the temperature at an elevation of 25 m above ground is 15 °C. If the inversion conditions prevail and the environmental lapse rate is 1.25 °C per 100 m, the temperature at an elevation of 200 m will be

1 12.5 °C

2 17.5 °C

3 12.75 °C

4 17.25 °C

View Answer

Answer: 17.25 °C

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3 When the temperature of the atmosphere falls at a rate greater than the dry adiabatic lapse rate, the atmosphere is

1 stable

2 highly stable

3 unstable

4 conditionally unstable

View Answer

Answer: unstable

4 Gross Primary Productivity (GPP) of an ecosystem is

1 net rate of carbon gain by the plant after respiration losses

2 total energy used to convert the sugar during growth.

3 photosynthetic fixation rate of atmospheric carbon dioxide

4 rate of release of oxygen through respiration of a plant.

View Answer

Answer: photosynthetic fixation rate of atmospheric carbon dioxide

5 The oxygen atom species, which reacts with water to form hydroxyl radical, is produced by the photodissociation of

1 O2

2 O3

3 NO2

4 H2O

View Answer

Answer: O3

6 Identify the incorrect statement about carbon isotopes :

1 C-13 is less abundant in vegetation than in oceans

2 C-12 is most abundant in nature

3 C-14 is absent in fossil fuels

4 C-13 is used for carbon-dating

View Answer

Answer: C-13 is used for carbon-dating

7 Among the following insecticides, which one is relatively more soluble in water ?

1 Aldicarb

2 Carbaryl

3 Malathion

4 Aldrin

View Answer

Answer: Aldicarb

8 Identify the incorrect statement about humus.

1 Humus acts as a reservoir of nitrogen for plants

2 By decaying, humus supplies nitrogen to plants

3 Its rate of decay and rate of nitrogen release follow plant growth.

4 Rate of nitrogen release to plants is slow during warm growing season and fast during winter months

View Answer

Answer: Rate of nitrogen release to plants is slow during warm growing season and fast during winter months

9 Drugs that prevent the formation of bacterial cell wall are

1 Quinolones

2 Beta-lactams

3 Tetracyclines

4 Aminoglycocides

View Answer

Answer: Beta-lactams

10 The predominant bioparticulate allergens in the air are

1 Insect debris and house dust mites

2 Pollen grains and fungal spores

3 Animal dander and house dust

4 Wool particles and cockroach calyx

View Answer

Answer: Pollen grains and fungal spores

11 The enhancement of the fitness of a recipient individual by acts that reduce the evolutionary fitness of the donor individual is

1 Amensalism

2 Altruism

3 Commonsalism

4 Parasitism

View Answer

Answer: Altruism

12 The change in species composition that is imposed by factors external to the biotic community is known as

1 Autogenic succession

2 Allogenic succession

3 Temperate deciduous forest

4 Boreal forest

View Answer

Answer: Allogenic succession

13 Which ecosystem type produces maximum litter mass ?

1 Tropical rain forest

2 Tropical seasonal forest

3 Temperate deciduous forest

4 Boreal forest

View Answer

Answer: Boreal forest

14 Which magma type contains the greatest amount of silica ?

1 Basaltic

2 Andesitic

3 Rhyolitic

4 Peridotic

View Answer

Answer: Rhyolitic

15 Which group of following factors determine the discharge of a stream ?

1 Width, length and depth

2 Width, length and velocity.

3 Width, depth and velocity

4 Length, depth and run-off

View Answer

Answer: DWidth, depth and velocity

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