Ecosystems Reviewer

When the living space in an ecosystem is reduced, what happens to a population and to competition?

• The population contracts while the competition strengthens.

• The population expands and the competition strengthens.

• The population decreases as the competition decreases.

• The population strengthens as the competition increases.

Which best determines the number of predators that can live in an are?

• The amount of food (prey) available in the area

• The amount of snow in the area each year

• The number of other predators living in the area

• The number of abiotic factors present in the area

The chart shows the cheetah and lion populations in an area.

Which best explains the relationship between the cheetah and lion populations in the ecosystem?

• Cheetahs compete for the same habitat as lions, causing the lion population to drop.

• Cheetahs compete for the same prey as lions, causing the cheetah population to drop.

• Cheetahs are affected by the same diseases as lions, causing both populations to change in the same way.

• Cheetahs are affected by the same predators as foxes, causing both populations to change in the same way.

A pond food web includes insects, frogs, and snakes.

Frogs eat insects. Snakes eat insects and frogs.

How will the snakes most likely be affected by a sudden sharp increase in local populations of insects?

• The snake population will either stabilize or increase.

• The snake population will migrate to another area.

• The snake will have to find another food source or risk starvation.

• Snakes will have to compete more with each other for available food.

Certain types of fish live in the seafloor of ocean. What does the seafloor represent for fish?

• habitat

• community

• niche

• food

Below is an example of an energy pyramid.

What do levels A, B, and C have in common?

• They are consumers.

• They are producers.

• They are decomposers.

• They make their own food.

Cheetah and lion both feed on gazelle. Which best describes this relationship?

• competition

• cooperation

• mutualism

• parasitism

Which statement about parasitism is true?

• One organism benefits while the other is harmed.

• One organism benefits while the other is unaffected.

• Both organisms benefit.

• Both organisms are negatively impacted.

Which statement correctly describes commensalism?

• One organism benefits while the other is harmed.

• One organism benefits while the other is unaffected.

• Both organisms benefit.

• Both organisms are negatively impacted.

Which best describes the relationship between sea anemone and hermit crab?

• mutualism

• commensalism

• parasitism

• predation