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WorksheetsEcosystem 01
Total questions: 15
Worksheet time: 8mins
Select the incorrect food chain.
Grass → Grasshopper → Frog → Snake → Eagle
Phytoplanktons→ Zooplanktons → Small fish → Large fish
Diatoms → Zooplanktons → Small fish
Grass → Frog → Vulture
Productivity at the second trophic level is always
greater than the productivity at the first trophic level
less than the productivity at the first trophic level
equal to the productivity at the first trophic level
extremely variable compared to the productivity at the first trophic level.
Which of the following is the available biomass for the consumption to heterotrophs?
Secondary productivity
Ecological efficiency
Net primary productivity
Gross primary productivity
During primary succession,
the rate of succession is much faster, and climax is reached more quickly.
the rate of succession is very slow.
A pioneer species invades a barren area not colonised before.
Both B & C.
A climax community is
in equilibrium with the environment
stable, but is replaced soon during succession
characterised by presence of decreased capacity of biomass production
one of the seral community
Read the following statements and select the incorrect statement.
Plants capture only 1-5% of incident solar radiations in synthesis of organic matter.
Energy does not remain trapped permanently in any organism.
The energy passes from autotrophs to herbivores and it can be passed back to autotrophs.
Energy of food is concentrated form while its highly dispersed form is heat.
Mark the incorrect match with respect to ecological pyramids.
Pyramid of biomass in pond – Usually upright
Pyramid of number in grassland – Usually upright
Pyramid of energy in pond – Always upright
Pyramid of biomass in grassland – Usually upright
Oceans have less productivity than terrestrial ecosystems because
Algae perform only 10% of the total photosynthesis of earth.
There is less availability of nitrogen in oceans
Less sunlight intensity is available inside the sea water
Both B and C
All of the following factor(s) affect the primary productivity of ecosystem, except
Composition of plant species present in the area
Availability of nutrients and moisture in soil
Intensity and wavelength of available solar radiations
Composition of consumers in the ecosystem
Given below is a food chain of a terrestrial ecosystem.
Grass → Grasshopper → Frog → Snake
If the energy available to heterotrophs at the level of grass is 100 KJ, what will be the amount of energy available to frogs?
10,000 J
1000 J
100 J
10 J
If 10,000 J of energy is present at the T1 level, then what is the energy available at the T2 level?
1000 J
10 J
100 J
1J
The definition given below describes:
“The mass of living material at a trophic level at a particular time."
Gross primary productivity
Standing state
Net primary productivity
Standing crop
Major conduit for energy flow in an aquatic ecosystem is
Parasitic food chain
Detritus food chain
Grazing food chain
Decomposition
Which of the following statements is incorrect regarding the ecological pyramid?
Pyramid of energy is always upright.
The pyramid of biomass of aquatic ecosystem is generally inverted.
Energy at a lower trophic level is always more than at a higher level.
Saprophytes always occupy the third trophic level in an ecological pyramid.
The intrinsic rate of natural increase (r) is a measure of
inherent potential of a population to grow.
increase in population due to emigration.
Steep increase in population due to resource partitioning
None of the above
