Home Biology Biodiversity and Conservation Image Based Problems The great German naturalist and geographer A…
Biology Biodiversity and Conservation Image Based Problems Single Correct MCQ
Published on: August 20, 2026

The great German naturalist and geographer Alexander von Humboldt observed that within a region species richness increased with increasing explored area, but only up to a limit. In fact, relation between species richness and area for a wide variety of taxa (angiosperm plants, birds, bats, reshwater fishes) turns out to be rectangular hyperbola. Now find out correct equations shown in the graph.

A
I - S = CAZ; II- log S = log C + Z log A
B
I - log S = log C + Z log A; II - S- CAZ
C
I-S = CAZ + log C; II- log S = log C + Z log A
D
I - S = CAZ + log A; II - log S = log C + Z log A

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The correct answer is:
A

Alexander von Humboldt described the species–area relationship:

On a normal scale, the relationship is:

S = CA z (rectangular hyperbola)

On a log scale, it becomes a straight line:

log S = log C + Z log A

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