Free Printable Ecology Review

Worksheets

Ecology Review

Total questions: 20

Worksheet time: 19mins

Name

Class

Date

Which of the following parts of an ecosystem are biotic?

Plants

Water

Air

Light

There are birds that eat the food from between the teeth of alligators, leaving the alligators with clean teeth and the birds with a meal. What type of ongoing relationship is this?

A. Predator & Prey

B. Mutualism

C. Competition

D. Parasitism

Which of the following have a predator and prey relationship?

A. Clownfish and sea anemone

B. Mushroom and a log

C. A deer and a rabbit

D. Spider and a fly

Some limiting factors that affect the size of populations include lack of food, lack of water, lack of living space, and the spread of disease.

True

False

If there are not enough predators and too many prey, the prey population may eventually starve.

True

False

Which situation would BEST allow the long-term survival of a native rabbit population in an ecosystem?

New producer species immigrates to the ecosystem and decreases the diversity of producers.

The population size of the rabbit's predators and the grasses they eat remain constant.

Humans in the ecosystem reduce the number of predators in the area.

A new herbivore that feeds on the same plants as the rabbit moves into the ecosystem

Look at this food web. What would most likely happen if the population of rabbits decreased?

The owl population would increase

The plant population would decrease

The plant population would increase

The mouse population would be totally unaffected

Based on the food web shown above, which of the following is most likely responsible for the rabbit population trend as shown in the graph?

increase in amount of grass

decrease in amount of grass

overpopulation in squirrel population

decrease in hawk population

Look at this graph of the populations of rabbits (prey) and lynx (predator). Lynx is small wild cat that eats rabbits.

What starts to happen in 1865?

The lynx population starts to decrease

The lynx population starts to increase

The rabbit population stays the same

The rabbit population starts to increase

10.

Look at this graph of the populations of rabbits (prey) and lynx (predator). Lynx is small wild cat that eats rabbits.

The populations go up and down. After a time of decreasing, which population starts to increase first?

Lynx

Rabbit

There is not enough information to answer this question

11.

Look at this graph of the populations of rabbits (prey) and lynx (predator). Lynx is small wild cat that eats rabbits.

In 1860, 1870, 1880, the population of rabbits began to increase. What pattern in the lynx population begins during the years that followed?

The lynx population increases

The lynx population decreases

There is not enough information to answer this question

12.

Why might a rabbit population start to decrease?

The population grows large and rabbits start competing with each other for food.

The predators population grows large and eats many of the rabbits.

Both of these are possible reasons that the rabbit population might start to decrease.

There is not enough information to answer this question

13.

The diagram below shows the feeding relationships between populations of organisms in an area. The arrows point from the organisms being eaten to the organisms that eat them.

Using only the relationships between the organisms shown in the diagram, predict the effect on the other organisms if most of the grasshoppers are killed by a frost. (Choose all the likely changes)

The grass population will likely increase

The grass population will likely decrease

The mouse population will likely increase

The mouse population will likely decrease

The owl population will likely decrease

14.

Imagine that an invasive, fast-growing tree species was introduced into this ecosystem. The new tree species directly competes with the Eastern Hemlock for space and it is not eaten by any of the herbivores in the ecosystem.

Which of the following changes would likely happen in this ecosystem? (Click more than one)

The Eastern Hemlock population would likely increase.

The Eastern Hemlock population would likely decrease.

The white-tailed deer population would likely increase.

The white-tailed deer population would likely decrease.

Eventually, Eastern Hemlock may disappear from this ecosystem.

15.

Which organisms are predators of the piping plover? (Click all that apply)

Foxes

Dogs

Cats

Raccoons

Great horned owls

16.

If the population of Piping Plovers decreased, what would likely happen to the population of foxes?

The population of foxes would definitely increase

The population of foxes would definitely decrease

The population of foxes might decrease because they eat Piping Plovers, but if there are enough other foods for the fox, then the population may be unaffected.

17.