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Biology · 2025 · 3 marks
CBSE 2025 · Region 1 · Set 2 · Q23
The great German naturalist and geographer Alexander Von Humboldt observed that within a region species richness increased with increasing explored…
The great German naturalist and geographer Alexander Von Humboldt observed that within a region species richness increased with increasing explored area, but only upto a limit.
(a)
For the above situation, construct a graph and write an equation.
(b)
Also write various values of Z (regression coefficient).
Marking-scheme solution
(a)
-Equation
\[\log \mathrm{S}=\log \mathrm{C}+\mathrm{Z} \log \mathrm{~A} / \mathrm{S}=\mathrm{CA}^{\mathrm{Z}}
\]
(b)
$\displaystyle \mathrm{Z}=$ in range of $\displaystyle 0.1$ to $\displaystyle 0.2$ regardless of taxonomic group or the region /
$\displaystyle \mathrm{Z}=0.6$ to $\displaystyle 1.2$ for the entire continent / $\displaystyle \mathrm{Z}=1.15$ frugivorous birds and mammals in the tropical forests.
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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.