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

Questions

61 Which one of the following statements is correct for secondary succession?

1 It is similar to primary succession except that it has a relatively fast pace

2 It begins on a bare rock

3 It occurs on a deforested site

4 It follows primary succession

View Answer

Answer: It occurs on a deforested site

62 An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having

1 High stability and high resilience

2 Low stability and low resilience

3 High stability and low resilience

4 Low stability and high resilience

View Answer

Answer: Low stability and high resilience

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63 Trophic levels in ecosystem is formed by :

1 only herbivores

2 only plants

3 only bacteria

4 Organisms linked in food chain

View Answer

Answer:Organisms linked in food chain

64 "Complete competitors cannot coexist" is true for

1 Primary succession

2 Secondary succession

3 Competitive exclusion

4 Character displacement

View Answer

Answer: Competitive exclusion

65 Terrestrial biomes has a rapid exchange of

1 Carbon dioxide

2 Oxygen

3 Water

4 All of the above

View Answer

Answer: All of the above

66 The rate of formation of new organic matter by rabbit in a grassland, is called

1 Net productivity

2 Net primary productivity

3 Secondary productivity

4 Gross primary productivity

View Answer

Answer: Secondary productivity

67 Ecology deals with the study of:

1 Living beings

2 Living and non living components

3 Reciprocal relationship between living and non living components

4 Environment

View Answer

Answer: Reciprocal relationship between living and non living components

68 Acacia arabica is

1 Hydrophyte

2 Mesophyte

3 Xerophyte

4 None of these

View Answer

Answer: Xerophyte

69 Of the total incident solar radiation the proportion of PAR is

1 More than 80%

2 About 70%

3 About 60%

4 Less than 50%

View Answer

Answer: Less than 50%

70 Total amount of living material at the various trophic levels of a food chain is depicted by pyramids of

1 Numbers

2 Energy

3 Biomass

4 All of these

View Answer

Answer: Biomass

71 The correct sequence of plants in a hydrosere is

1 Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus

2 Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox

3 Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak

4 Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana

View Answer

Answer: Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak

72 The remains of the dead plants and animals is called

1 Detritus

2 Detritivores

3 Humus

4 Litter

View Answer

Answer: Detritus

73 Bell-shaped polygonal pyramid indicates

1 Low percentage of young individuals

2 Moderate percentage of young individuals

3 High percentage of young individuals

4 Low percentage of old individuals

View Answer

Answer: Moderate percentage of young individuals

74 Autoecology deals with

1 Ecology of species

2 Ecology of many species

3 Ecology of community

4 All the above

View Answer

Answer: Ecology of species

75 The age of pyramid with broad base indicates

1 High percentage of old individuals

2 Low percentage of young individuals

3 High percentage of young individuals

4 Low percentage of old individuals

View Answer

Answer: High percentage of young individuals

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