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Solution


Q.

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that         [2015]
1 population A produced more offspring than population B  
2 population A consumed the members of population B  
3 both plant populations in this habitat decreased  
4 population B competed more successfully for food than population A  

Ans.

(4)

Both the populations are herbivorous, thus they cannot affect each other. If the food sources for these populations A and B have decreased, then both the populations A and B would have declined. If population A have produced more offspring then the graph A should have increased. Based on the graph, population B is more successful in competing with population A, that is why number of organisms in population B increased while that in population A decreased, as they get access to limited resources.