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Which of the following pyramids can never be inverted in a natural ecosystem?
Read page 249, XII NCERT
The earth is an open system with respect to
A constant input of energy is required to keep the stability of the ecosystem and overcome any entropy. This input is ultimately provided by the sun.
The earth is a closed system except for:
Read page 245, XII NCERT
Both hydrach and xerarch successions:
Page 251, XII NCERT
The limitations of ecological pyramids include all the following except:
Answer: 2
Read page 250,XII NCERT
The phosphorus cycle is unusual in that it is entirely:
Answer: 3
There is no significant atmospheric component in phosphorus cycle.
Which ecosystem has the maximum biomass?
(a) Biomass refers to the amount of living organic matter. Forest ecosystem have the maximum biomass, because it includes organisms of all tropic levels as compared to pond, lake or grassland ecosystem. In forest ecosystems productivity is also high that contributes to maximum biomass.
Th primary producers of the deep-sea hydrothermal vent ecosystem are
(b) The primary producers of the deep-sea hydrothermal vent ecosystem are archaebacteria.
These have chemosynthetic mode of nutrition. Thus option (b), i.e., chemosynthetic bacteria is the correct option.
Which of the following would appear as the pioneer organisms on bare rocks?
(d) In primary succession on rocks, lichens secrete acids to dissolve rock, helps in weathering and soil formation. So, lichens are pioneer species to colonize the bare rock.
The term ecosystem was coined by
(a) The term ecosystem was coined by AG Tansley in 1935. Ecosystem is a self regulated and self sustaining structural and functional unit of nature. It consists of living beings and their physical environment.
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