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Biology · 2022 · 3 marks
CBSE 2022 · Region 5 · Set 1 · Q10
(a) Given below is an equation describing the Species-Area relationship between species richness and area for a wide variety of taxa as angiosperm…
Given below is an equation describing the Species-Area relationship between species richness and area for a wide variety of taxa as angiosperm plants, birds, bats etc. \[\mathrm{S}=\mathrm{CA}^{\mathrm{z}} \]
(i)
Give a graphical representation of the given equation showing Species-Area relationship.
(ii)
What does 'S' represent in the given equation ?
(iii)
What is the value of 'Z' (regression coefficient) for frugivorous birds and mammals in the tropical forests of different continents ?
Given below is a 'pie chart' representing the global biodiversity : proportionate number of species of major taxa. Vertebrates
(i)
Identify (X) and (Y) in the given 'pie chart'.
(ii)
"Extinction of species across taxa are not random." Which group amongst the vertebrates is more vulnerable to extinction.
(iii)
Give one example each of recent extinctions of species in Russia, Mauritius and Australia.
Marking-scheme solution
(i)
(ii)
S = Species richness
(iii)
$\displaystyle 1$‧$\displaystyle 15$
(i)
X → Fishes
Y → Amphibians
(ii)
Y → Amphibians
(iii)
| Russia | - | Steller's sea cow |
| Mauritius | - | Dodo |
| Australia | - | Thylacine |
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.