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NCERT - Class 12 Biology Questions and Answers from Chapter "Ecosystem" | GkSeries

Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Ecosystem of Biology.
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(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
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
Answer: All of the aboveesert scrub
(3) Hydrarch succession takes place in
[1] Dry areas
[2] Wetter areas
[3] Bare area
[4] None of these
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
Answer: Stratification
(5) The region of earth, where life exists is known as
[1] Atmosphere
[2] Biosphere
[3] Lithosphere
[4] Hydrosphere
Answer: Biosphere
(6) Energy flow in ecosystem is
[1] Unidirectional
[2] Bidirectional
[3] Multidirectional
[4] None of the above
Answer: Unidirectional
(7) Concept of ecological pyramids was proposed by
[1] Odum
[2] Clements
[3] Tansley
[4] Charles Elton
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
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
Answer: Temperate deciduous forests
(10) An ecosystem must have continuous external source of
[1] minerals
[2] energy
[3] food
[4] All of the above
Answer: energy
(11) The more abundant animals in a desert grassland are
[1] Arboreal
[2] Diurnal
[3] Aquatic
[4] Fossorial
Answer: Fossorial
(12) The upright pyramid of number is absent in
[1] Lake
[2] Grassland
[3] Pond
[4] Forest
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
Answer: Sulphur cycle
(14) The source of energy in an ecosystem is
[1] ATP
[2] Sunlight
[3] D.N.A
[4] R.N.A
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
Answer: Both (A) and (B)

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