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Biology · 2026 · 2 marks
CBSE 2026 · Region 4 · Set 1 · Q21
(a) Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two ecosystem services.
(a)
Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two ecosystem services.
OR
(b)(i)
State, what does 'standing crop' of a trophic level represent.
(ii)
List any two ways of measuring the standing crop of a trophic level.
Marking-scheme solution
$\displaystyle 20$% of the total oxygen in the earth’s atmosphere produced by Amazon forest.
Pollination without which plants cannot give us fruits and seeds is another service
which ecosystem provides through honeybees or bumblebees or birds or and bats.
Provide aesthetic cultural and spiritual values.
Provide wildlife habitat and help in their sustenance.
Maintain balance in various components of ecosystem through photosynthesis
cycling of nutrients or generating fertile soil or mitigating droughts or controlling flood.
-Obtaining products of economic importance.
(i)
‘Standing crop’ of a trophic level represents the mass of living matter or biomass
at a given time.
(ii)
Measured as
biomass i.e mass of living organisms (dry weights) in an unit area.
number per unit area.
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