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NCERT - Ecosystem Questions and Answers for Class 12 | GkSeries

Questions
76 Which of the following is false?
1 Rate of succession is faster in secondary succession.
2 Quantity of biomass in a trophic level at a particular period is called as standing crop.
3 The energy content in a trophic level is determined by considering a few individuals of a species in that trophic level
4 The succession that occurs in newly cooled lava is called primary succession

Answer: The energy content in a trophic level is determined by considering a few individuals of a species in that trophic level
77 Succulent plants grow in
1 Tundra
2 Deserts
3 Tropical rain forests
4 Temperate deciduous forests

Answer: Deserts
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78 Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
1 It is upright in shape
2 Its base is broad
3 It shows energy content of different trophic level organisms
4 It is inverted in shape

Answer: It is inverted in shape
79 Which one of the following ecosystem types has the highest annual net primary productivity?
1 Tropical deciduous forest
2 Tropical rain forest
3 Temperate deciduous forest
4 Temperate evergreen forest

Answer: Tropical rain forest
80 Synecology deals with
1 Ecology of many species
2 Ecology of many populations
3 Ecology of community
4 None of the above

Answer: Ecology of community
81 Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
1 Goat
2 Frog
3 Sparrow
4 Lion

Answer: Sparrow
82 Organisms which break down detritus into matter particles
1 Herbivores
2 Carnivores
3 Detritivores
4 None of these

Answer: Detritivores
83 The nature’s cleaners are
1 Producers
2 Consumers
3 Decomposers and scavengers
4 Symbionts

Answer: Decomposers and scavengers
84 A renewable exhaustible natural resource is
1 Petroleum
2 Coal
3 Forest
4 Minerals

Answer: Forest
85 Ecotype is a type of species in which environmentally induced variations are
1 Temporary
2 Genetically fixed
3 Genetically not related
4 None of the above

Answer: Genetically fixed
86 Stratification is more common in
1 Deciduous forest
2 Tropical rain forest
3 Temperate forest
4 Tropical savannah

Answer: Tropical rain forest
87 DDT residues are rapidly passed through food chain causing biomagnification because DDT is
1 Water soluble
2 Lipo soluble
3 Moderately toxic
4 Non-toxic to aquatic animals

Answer: Lipo soluble
88 Average total rainfall is 100 - 150 cm in ______, located in Australia, South America and Africa.
1 Tropical Savannas
2 Chaparrals
3 Deciduous forest
4 Temperate forest

Answer: Chaparrals
89 Pyramid of energy in ecosystems is
1 Always upright
2 Always inverted
3 Mostly upright
4 Mostly inverted

Answer: Always upright
90 The most recently discovered ecosystem is
1 Vents
2 Crater
3 Tundra
4 Floating iceberg

Answer: Vents
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