MCQs on Ecosystem | NCERT - Class 12 Biology Questions and Answers from Chapter Ecosystem | Ecosystem - Biology Questions and AnswersSolution for Class 12 | MCQs on Biology | CBSE - Class 12 Biology Questions and Answers

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Sparrow

82 Organisms which break down detritus into matter particles

1 Herbivores

2 Carnivores

3 Detritivores

4 None of these

View Answer

Answer: Detritivores

83 The nature’s cleaners are

1 Producers

2 Consumers

3 Decomposers and scavengers

4 Symbionts

View Answer

Answer: Decomposers and scavengers

84 A renewable exhaustible natural resource is

1 Petroleum

2 Coal

3 Forest

4 Minerals

View Answer

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

View Answer

Answer: Genetically fixed

86 Stratification is more common in

1 Deciduous forest

2 Tropical rain forest

3 Temperate forest

4 Tropical savannah

View Answer

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

View Answer

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

View Answer

Answer: Chaparrals

89 Pyramid of energy in ecosystems is

1 Always upright

2 Always inverted

3 Mostly upright

4 Mostly inverted

View Answer

Answer: Always upright

90 The most recently discovered ecosystem is

1 Vents

2 Crater

3 Tundra

4 Floating iceberg

View Answer

Answer: Vents

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