CSIR NET Life Science Previous Year Questions and Solution on Biogeography
Fragmentation breaks up contiguous tracts of natural habitats into smaller patches. In a fragmented landscape where a previously large forest has become a mosaic of patches of different sizes, the following statements can be made about the fragment size and its species diversity. A. Smaller fragments will always have lower species richness than larger fragments. […]
Fragmentation breaks up contiguous tracts of natural habitats into smaller patches. In a fragmented landscape where a previously large forest has become a mosaic of patches of different sizes, the following statements can be made about the fragment size and its species diversity. A. Smaller fragments will always have lower species richness than larger fragments […]
Two islands (A and B) located approximately 180 km and 100 km respectively from the mainland. Island A is 160 sq. km, while Island B is 220 sq. km in area. Which one of the following statements is correct? (1) Island A is likely to have higher extinction and lower colonization rates than Island B. […]
Select the correct statement from the options given below to complete the following. In the 1960s, experiments were conducted to test the theory of island biogeography. The main findings of these studies indicate that over a long period of time__________ (1) the rate of extinction and colonization are not equal to each other. (2) the […]
The equilibrium model of island biogeography proposed by MacArthur and Wilson assumes that the number of species on an island represents a balance between (1) resource consumption rate and predation rate. (2) birth rate and death rate. (3) colonization rate and extinction rate. (4) speciation rate and hybridization rate The Foundations of the Equilibrium Theory […]
Which of the following is NOT a prediction arising out of Wilson-MacArthur’s -Theory of Island Biogeography? (1) The number of species on an island should increase with its size/area. (2) The number of species should decrease with increasing distance of the island from the source pool. (3) The turnover of species should be common and […]
According to MacArthur and Wilson’s equilibrium theory, which of the following is true? (1) Larger islands and islands closer to continent are expected to have more species than smaller and isolated islands. (2) Smaller islands and islands far from the continent are expected to have more species than larger and isolated islands. (3) Smaller islands […]
The above graph illustrates two lines that represent the immigration and extinction rates for an island based on its distance from mainland (solid line) and its size (dotted line). Which of the following is true for this island? (1) It is close to the mainland and is very small. (2) It is far from mainland […]
A researcher working on island biogeography mapped how isolation-controlled immigration (l), and area-controlled extinction (E), will act on number of species present on the islands. He forgot to label the size of the islands (small or large) and the location of the islands (near or far) on the graph. Using information from MacArthhur and Wilson’s […]
18. The theory of island biogeography has synthesized into theory the following concepts, except: (1) Competition (2) Immigration (3) Equilibrium (4) Speciation Core Concepts Synthesized in the Theory MacArthur and Wilson’s equilibrium model is built around several key ecological concepts: Immigration: The arrival of new species from a source pool, typically the mainland or a larger, […]
