Adaptations/Natural Selection Review

Organisms that can adapt to changes in their environment are most likely to survive and reproduce, while those that cannot adapt die out. This idea is known as:

• A. mutation.

• B. natural selection.

• C. variation.

A bear sleeps all winter. What is this form of adaptation called?

• A. Playing dead

• B. Hibernation

• D. camouflage

A certain species of rodent eats only one type of plant. A disease attacks those plants and wipes them out. Which of the following best explains what might happen next?

• B. The number of this type of rodent will decrease to a point near extinction.

• C. The number of this type of rodent will increase and overpopulate.

The fins on a fish are an example of:

• A. Structural adaptations

• B. Behavioral adaptations

• C. Physiological adaptations

The snowshoe hare has the ability to change its coat color. It is brown during the spring, summer, and early fall but changes to white as winter approaches. What adaptation does the snowshoe hare have that allows it to hide from predators?

• A. symbiosis

• B. commensalism

• C. camouflage

The salt glands which excrete salt in some fish [sharks and rays] are an example of..

• A. Structural adaptations

• B. Behavioral adaptations

• C. Physiological adaptations

Suppose a particular predator in an area eats rabbits. If hunters kill off all of those predators, the rabbit population will increase, resulting in more competition among the rabbits for food and space.

• A. competition

• B. extinction

• C. symbiosis

Look at the food web below: decomposers producers herbivores carnivores Which of the following changes would cause the population of producers in this forest ecosystem to increase?

• A. a decrease in carnivores such as owls and fox

• B. a decrease in decomposers such as bacteria and fungi

• D. an increase in herbivores such as deer and rabbits

Fish swimming in schools is an example of..

• A. Structural adaptations

• B. Behavioral adaptations

• C. Physiological adaptations

What usually happens to a population of organisms when the region's carrying capacity has been reached?

• C. The population stops growing or levels off.

• D. The population begins to increase.