German naturalist and geographer Alexander von Humboldt proposed graph given below .Identify A in the graph ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4)- Species richness.
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, the relation between species richness and area for a wide variety of taxa (angiosperm plants, birds, bats, freshwater fishes) turns out to be a rectangular hyperbola .
On a logarithmic scale, the relationship is a straight line described by the equation
log S = log C + Z log A
where,
S= Species richness
A= Area
Z = slope of the line (regression coefficient)
C = Y-intercept.