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Biology · 2024 · 2 marks
CBSE 2024 · Region 3 · Set 1 · Q21
(a) Write important features of 'humus' formed during the decomposition cycle in a terrestrial ecosystem.
(a)
Write important features of 'humus' formed during the decomposition cycle in a terrestrial ecosystem.
OR
(b)(i)
Graphically represent the relationship between species richness and area on a log-log scale for bats and fishes.
(ii)
Write the equation for the relationship as on a logarithmic scale.
Marking-scheme solution
Humus – Dark coloured, amorphous, highly resistant to microbial activities, undergoes
decomposition at slow rate, colloidal, reservoir of nutrients.
(i)
(ii)
Log S = Log C + Z Log A
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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.