CBSE 2026 · Region 4 · Set 1 · Q21 · 2 marks
Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two ecosystem services.(b)State, what does 'standing crop' of a trophic level represent.(ii)List any two ways of measuring the standing crop of a trophic level.
Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two ecosystem services.
(b)
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.
(b)
‘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.
Biodiversity and ConservationBiodiversity ConservationUnderstandvery_short_answermedium
More from Biodiversity and Conservation
- Enlist two criteria that are used to identify a region for maximum protection as 'Biodiversity hotspots'.…2022 · asked 3×
- Given below is a pie chart representing global diversity of vertebrates. Redraw the pie chart identifying the…2024 · asked 3×
- According to a recent wildlife report, the biggest threat to the tiger's survival in Mudumalai Tiger Reserve…2025 · asked 3×
- India has only 2.4% of the world's land area but its share of the global species diversity is:2025 · asked 3×
- Tropical regions harbour more species than the temperate regions. How have biologists tried to explain this…2024 · asked 3×
- Which of the following sacred groves is found in Meghalaya?2026 · asked 3×
- There are many animals, which have become extinct in the wild, but continue to be maintained in zoological…2026 · asked 3×
- Given below is a picture of a natural large habitat that is being continuously broken into smaller patches.…2022 · asked 3×
CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.