Question

The population size of a species over time is shown in the graph. The difference in population size between time 2 and time 3 is depicted by

• A. Decline in populations of parasitic species
• B. Decline in predator population size
• C. Decline in interspecies competition
• D. Decline in intraspecies competition
• E. Decline in available food resources

Answer 1

The correct option is E Decline in available food resources

Predation, parasitism, competition and various other factors impart a cumulative effect on population size. It is never deterimined by any of above mentioned single factor. Rather any drastic change or natural calamity such as drought, femine, and flood can alone reduce the population size making option E correct answer.