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Biology · 2025 · 3 marks
CBSE 2025 · Region 7 · Set 1 · Q28
Name the type of food chains responsible for the flow of larger fraction of energy in an aquatic ecosystem and a terrestrial ecosystem, respectively.…
Name the type of food chains responsible for the flow of larger fraction of energy in an aquatic ecosystem and a terrestrial ecosystem, respectively. Mention any two differences between the two food chains.
Marking-scheme solution
In an aquatic ecosystem-Grazing food chain (GFC).
In a terrestrial ecosystem-Detritus food chain (DFC).
Differences –
Grazing Food Chain
Detritus food chain
Transfer of energy starts
from producers in a food
chain.
Transfer of energy starts from detritus /decomposing organic matter.
More energy flows through
this.
Less amount of energy flows
through this .Energy obtained from Sun
Energy obtained from dead
organic matter
Major conduit of energy in
aquatic system
Major conduit of energy in
terrestrial system
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.