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

Questions

1 The pyramid of energy in any ecosystem is

1 Always upright

2 May be upright or invented

3 Always inverted

4 None of the above

View Answer

Answer: Always upright

2 single bacterium in the soil interacts with

1 The water

2 Air

3 Particles of soil around it

4 All of the aboveesert scrub

View Answer

Answer: All of the aboveesert scrub

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3 Hydrarch succession takes place in

1 Dry areas

2 Wetter areas

3 Bare area

4 None of these

View Answer

Answer: Wetter areas

4 Which one of the following is not a functional unit of an ecosystem?

1 Productivity

2 Stratification

3 Energy flow

4 Decomposition

View Answer

Answer: Stratification

5 The region of earth, where life exists is known as

1 Atmosphere

2 Biosphere

3 Lithosphere

4 Hydrosphere

View Answer

Answer: Biosphere

6 Energy flow in ecosystem is

1 Unidirectional

2 Bidirectional

3 Multidirectional

4 None of the above

View Answer

Answer: Unidirectional

7 Concept of ecological pyramids was proposed by

1 Odum

2 Clements

3 Tansley

4 Charles Elton

View Answer

Answer: Charles Elton

8 Which of the following statements is correct?

1 Least productive ecosystem is desert and deep lake

2 Sugarcane is the most productive agroecosystem

3 Most productive ecosystem is coral reef

4 All the above

View Answer

Answer: All the above

9 Quercus species are the dominant component in

1 Tropical rain forests

2 Temperate deciduous forests

3 Alpine forests

4 Scrub forests

View Answer

Answer: Temperate deciduous forests

10 An ecosystem must have continuous external source of

1 minerals

2 energy

3 food

4 All of the above

View Answer

Answer: energy

11 The more abundant animals in a desert grassland are

1 Arboreal

2 Diurnal

3 Aquatic

4 Fossorial

View Answer

Answer: Fossorial

12 The upright pyramid of number is absent in

1 Lake

2 Grassland

3 Pond

4 Forest

View Answer

Answer: Forest

13 Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

1 Nitrogen cycle

2 Carbon cycle

3 Sulphur cycle

4 Phosphorus cycle

View Answer

Answer: Sulphur cycle

14 The source of energy in an ecosystem is

1 ATP

2 Sunlight

3 D.N.A

4 R.N.A

View Answer

Answer: Sunlight

15 In the biosphere energy is received from

1 The Sun

2 The interior of the earth

3 Both (A) and (B)

4 Work

View Answer

Answer: Both (A) and (B)

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