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12.Ecosystem
normal
The graph below shows the changes in two populations of herbivores in a grassy field. A possible reason for these changes is that
A
all of the plant populations in this habitat decreased
B
population $B$ competed more successfully for food than population $A$ did
C
population $A$ produced more offspring than population $B$ did.
D
population $A$ consumed the members of population $B$.
(AIIMS-2009)
Solution
If population $B$ increased while population $A$ decreased, these organisms were probably in competition for the same food (grass) and population $B$ was better adapted. Hence, population $A$ is competitively being excluded from the population.
Standard 12
Biology
