Statement 1

In some cases varying the population of an organism may not affect an ecosystem, because some organisms are not important. (39.7%)

All organisms in an ecosystem have an affect on some other organisms within in at any one time. That is the nature of an ecosystem. This was therefore a BLUFF

Statement 2

The relative sizes of prey and predator populations have no bearing on the size of the other. (20.7%)

This was a BLUFF. The relative sizes have a great affect on each other. If the number of rabbits declines so will the number of foxes. Unless there was another source of food for the fox within the ecosystem …mice maybe.

Statement 3

Populations exist in a state of dynamic equilibrium, fluctuating in numbers around an average population size. (19%)

This is TRUE. Populations are changing all the time.

Statement 4

Species coexist in an ecological system because of their compatible needs and behaviours: they get along. (12.1%)

This is a BLUFF.

Statement 5

Plants are the weakest members of a food chain because they cannot defend themselves. (8.6%)

This is a BLUFF. Plants are quite good at defending themselves. Think of stinging nettles.