A: Agriculture and aquacultures are man maintained ecosystems.
R: All biotic and abiotic factors are managed by humans in these ecosystems.
A: Warm and moist environments can enhance the rate of decomposition.
R: Warm and moist climate leads to an anaerobic condition which promotes decomposition.
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A: Detritus food chain begins with detritus.
R: Detritivores like fungi and bacteria are major decomposers in such food chains.
A: Ecological pyramids cannot explain all the vital functions of any ecosystem.
R: Pyramids actually do not explain the role of organisms working at more than one trophic
level.
A: The successive process starts only in those areas, where no living organisms ever existed.
R: Physical environmental conditions do not support these areas.
A: In secondary productivity, no new organic matter is formed.
R: It is only utilising part of food manufactured by primary producers to building of consumer biomass.
A: Detritivores and decomposers hold up a part of nutrients contained in detritus.
R: Immobilised nutrients cannot be available for solubilisation after the death of saprotrophs.
A: Neither the community modifies environment, nor the environment forces the community to leave the place in the climax stage of succession.
R: Climax community is xerophytic in most of the types of succession.
A: Ecological pyramids of biomass are generally inverted in the sea.
R: Biomass of fishes far exceeds that of phytoplanktons.
A: Pyramid of biomass pyramid is always upright for the tree ecosystem.
R: Total biomass of a tree in a specific area is more than that of herbivores.
A: Niche becomes general and broader during biotic succession.
R: Species diversity increases, but organic matter is decreased.
A: Stratification helps in the accommodation of a large number and types of plants in the same area.
R: It is the occurrence of horizontal zonation in the ecosystem.
A: During succession, nutrient availability decreases while biomass level increases.
R: NCP (Net community productivity) remains the same during succession.
A: Decomposers are excluded from the food chains.
R: They act on all trophic levels of a food chain.
Decomposers act at each trophic level.
A: In hydrosere, reed swamp stage is followed by a floating plant stage.
R: Sedge meadow stage has amphibious herbaceous plants.
26 videos|287 docs|64 tests
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26 videos|287 docs|64 tests
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