Exam 35: Populations and Communities

What types of density-dependent effects do we see in human populations as conditions become crowded due to overpopulation?

______________ occurs when one organism physically resembles another.

An experiment that was conducted by Gause in the 1930s with Paramecium clearly demonstrated:

The back-and-forth evolutionary adjustments species make to each other are examples of _________________.

A snake that has evolved to look similar to a branch will probably be able to avoid:

Species that live in the same geographical area are called sympatric.

All of the following are characteristics of an r-selected population except:

If you remove mountain lions from their habitat and the diversity of other species decreases,the mountain lion was likely a:

Populations of different species that live together in the same place are called ________.

In true commensalism,both partners benefit.

After much study,ecologists have come to the conclusion that competitive exclusion:

According to the logistic growth model,as N approaches K:

A _____________ ecologist would be interested in how biological communities interact with their physical environment.

Which organism is more likely to go extinct-one with a specialized,narrow niche or one with a broad,generalized niche? Explain your answer.

Choose the best definition of a community.

A camouflaged animal uses aposematic coloring to hide from predators.

If a plant species grows where no life existed before,this is a:

The rate at which a population can increase when food and habitat are limitless is called:

When organisms change their behavior to avoid competition,it is called ____________________________.

When a population reaches the carrying capacity of its habitat,the effects of crowding can be felt.Which of the following is NOT a density-dependent effect?