Environmental Studies Questions and Answers for Competitive Exams | Environmental Studies Quiz Set 25

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

Answer: 17.25 °C
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

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.

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

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

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

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

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

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

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

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

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

Answer: Boreal forest
14 Which magma type contains the greatest amount of silica ?
1 Basaltic
2 Andesitic
3 Rhyolitic
4 Peridotic

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

Answer: DWidth, depth and velocity

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