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

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(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

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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
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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