Exam 23: Ecological Communities

Human cells contain mitochondria,which are responsible for processing the energy needed by our cells.Remember that the ancestors of mitochondria may once have been free-living prokaryotes.If mitochondria were still considered separate organisms within human cells,which of the following would best describe the relationship with them?

Coevolution often occurs when natural selection produces evolutionary change in predator and prey populations;a good example is

Which of the following patterns represents the outcomes of a commensalistic relationship?

Mutualistic relationships can have an effect on the distribution and abundance of the species involved.

Succession has a major impact on the species makeup of a community at any given point in time.

The number of different species that live in the community and the relative abundances of those species are the two components that characterize the community's ________.

Exploitation occurs in many forms;those interactions that result in the immediate death and consumption of the prey are classified as ________.

Which example best illustrates interference competition?

Without pollinator mutualism,agricultural productivity could fall significantly.

Once a mature community develops,is it likely to remain that way indefinitely?

During the past 35 million years,the climate of North America has experienced significant change.

Due to competition,forms of competing species may evolve to become more different from each other over time.This change is known as character ________.

An animal eats fruit from a plant and later deposits seed in its feces far from the plant.This is an example of a

If researchers were to document that the diversity of anemones lacking resident clownfish was approximately equal to those with clownfish,it would suggest that the interaction between these two species was

An organism that transfers one plant's male reproductive cells to the female reproductive organs of another plant is a(n)________.

Female ducks frequently deposit fertile eggs in the nests of unattended neighboring ducks.These eggs hatch and are then reared by the foster parent.What term best describes this behavior?

In the pollinator mutualism between the yucca plant and the yucca moth,the yucca plant is able to abort the seeds in any given flower if the moth lays too many eggs in that flower.What is the advantage the yucca plant gains by aborting these seeds?

Human-caused changes in ecological communities can be considered unique because

The interactions that occur between species can be categorized on the basis of the outcomes the interaction produces;when both species benefit,the interaction is ________.

A community whose species are not replaced by other species is classified as a ________ community.