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Question 1.
Given below is one of the types of ecological pyramids. This type represents
(a) Pyramid of numbers in a grassland
(b) Pyramid of biomass in a follow land
(c) Pyramid of biomass in a lake
(d) Energy pyramid in a spring
Answer: (c) Pyramid of biomass in a lake
Question 2.
Energy transferred from one trophic level to another
(a) 5%
(b) 10%
(c) 15%
(d) 20%
Answer: (b) 10%
Question 3.
Maximum absorption of rainfall water is done by
(a) Tropical deciduous forest
(b) Tropical evergreen forest
(c) Tropical savannah
(d) Scrule forest
Answer: (b) Tropical evergreen forest
Question 4.
Which of the following is called as a detrivore?
(a) An animal feeding on decaying organic matter
(b) An animal feeding on a plant
(c) A plant feeding on an animal
(d) An animal feeding on another animal
Answer: (a) An animal feeding on decaying organic matter
Question 5.
The pyramid of energy is always upright for any ecosystem. This situation indicates the fact that:
(a) producers have the lowest energy conversion efficiency
(b) carnivores have a better energy conversion efficiency
(c) energy, conversion efficiency is the same in all trophic levels
(d) herbivores have a better energy conversion efficiency than carnivores.
Answer: (d) herbivores have a better energy conversion efficiency than carnivores.
Question 6.
Which of the following pairs is mismatched?
(a) Tundra-permafrost
(b) Savanna-Acacia trees
(c) Praire-epiphytes
(d) Coniferous forest-evergreen trees
Answer: (c) Praire-epiphytes
Question 7.
The most abundant element present in the plants is
(a) nitrogen
(b) manganese
(c) iron
(d) carbon
Answer: (d) carbon
Question 8.
These belong to the category of primary consumers
(a) Insects and cattle
(b) Eagle and snakes
(c) Water insects
(d) Snakes and frogs
Answer: (a) Insects and cattle
Question 9.
Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem?
(a) Tertiary production
(b) Gross production
(c) Net production
(d) Secondary production
Answer: (b) Gross production
Question 10.
Largest reservoir of sulphur is
(a) Atmosphere
(b) Rocks
(c) Ocean
(d) Lake
Answer: (b) Rocks
Question 11.
Maximum productivity is found in
(a) Grassland
(b) Desert
(c) Ocean
(d) Tropical rain forest
Answer: (c) Ocean
Question 12.
Concentration of nitrogen remains constant by
(b) Nitrogen cycle
(b) Thundering and lightning
(c) Enzymes
(d) Both (a) and (b)
Answer: (d) Both (a) and (b)
Question 13.
In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
(a) Consumers
(b) Producers
(c) Decomposers
(d) None of these
Answer: (b) Producers
Question 14.
If there was no CO2 in the earth’s atmosphere, the temperature of the earth’s surface would be
(a) Same as the present
(b) Less than the present
(c) Higher than the present
(d) Depends on the amount of O2 in the atmosphere
Answer: (b) Less than the present
Question 15.
Bacterial role in carbon cycle is
(a) Chemosynthesis
(b) Photosynthesis
(c) Breakdown of organic matter
(d) Assimilation of nitrogen compounds
Answer: (c) Breakdown of organic matter
Question 16.
Which important greenhouse gas, other than methane is being produced from the agricultural fields?
(a) Arsine
(b) Sulphur dioxide
(c) Ammonia
(d) Nitrous oxide
Answer: (d) Nitrous oxide
Question 17.
Zone of atmosphere near the ground is
(a) Troposphere
(b) Stratosphere
(c) Homosphere
(d) All of these
Answer: (a) Troposphere
Question 18.
CO2 content of atmosphere is about
(a) 6.5%
(b) 3.334%
(c) 0.34%
(d) 0.034%
Answer: (d) 0.034%
Question 19.
Ultraviolet radiation from sunlight causes a reaction which produces
(a) O3
(b) SO2
(c) CO
(d) CH4
Answer: (a) O3
Question 20.
Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considerd as Occupying
(a) First trophic level
(b) Second trophic level
(c) Third trophic level
(d) Fourth trophic level
Answer: (b) Second trophic level
