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Biology · 2024 · 3 marks
CBSE 2024 · Region 5 · Set 3 · Q27
(a) Construct a pyramid of biomass in sea with phytoplankton and fishes. Explain giving reasons about the characteristic of the constructed pyramid.…
(a)
Construct a pyramid of biomass in sea with phytoplankton and fishes. Explain giving reasons about the characteristic of the constructed pyramid.
(b)
In which condition will the pyramid remain always upright ?
Marking-scheme solution
(a)
The pyramid of biomass in sea is generally inverted, because the biomass of fishes far exceeds that of phytoplankton.
(b)
Pyramid of energy will always be upright as energy flow is unidirectional from producers to consumers. / The energy availability of the producers is always more than the consumers. / When the number or biomass of producers are more than the consumers.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.