Answer:

Correct Answer: B

Solution:

• The graph shows changes in two populations (A and B) of herbivores in a grassy field. To determine the possible reason for these changes, let’s analyze the options:

A) Both plant populations in this habitat decreased: If the plant populations decreased, it would likely affect both herbivore populations similarly, unless one population had a competitive advantage. This option does not directly explain the observed changes in the graph.

B) Population-B competed more successfully for food than population-A: This option suggests that Population-B was better at obtaining food resources, which could lead to an increase in Population-B and a decrease in Population-A. This explanation aligns with the observed changes in the graph, where Population-B increases while Population-A decreases.

C) Population-A produced more offspring than Population-B: If Population-A produced more offspring, we would expect to see an increase in Population-A rather than a decrease. This option does not explain the observed changes in the graph.

D) Population-A consumed the members of Population-B: Since both populations are herbivores, it is unlikely that Population-A would consume members of Population-B. This option does not fit the context of the graph.