Unit 5 7th grade test review

What is the function of hollow bones in birds?

• to make bones strong enough for flight

• to reduce the weight of birds for flight

Which of the following statements BEST describes the function of the large ears of an elephant?

• The elephant's ears can be nearly 2- meters long.

• The ears help the elephant cool itself on a hot day.

• The elephant's ears have many blood vessels close to the surface

Penguins are unusual birds. They swim under water but do not fly. Penguins live in some of Earth's coldest climates, where they feed on sea animals. Unlike most birds which have bones that are hollow, a penguin has solid bones. This difference makes it easier for a penguin to —

• dive deep under water

• detect fish under water

• stay warm under water

What is the most likely reason Clydesdales were bred?

• to pull farm equipment

• to run races

• to march in parades

If an environment becomes warmer and drier, the change that would most likely help a species adapt would be an increase in its

• amount of body hair.

• ability to climb trees.

• ability to store water.

Which is an example of animal migration?

• Goldfinches grow new feathers twice a year.

• Canada geese fly to new locations twice a year.

• Eastern gray squirrels have babies twice a year.

• Artic foxes change color of their fur twice a year.

Scientists have discovered that cobs from corn plants are larger and have more kernels than cobs thousands of years ago. Which farming technique is most likely used to grow corn with larger cobs?

• protecting corn crops from insect pests

• growing the corn in arid conditions

• farming in areas with long growing seasons

• selectively breeding corn plants every year

Crickets communicate with other crickets by chirping. Crickets who cannot make a sound are less likely to find a mate and reproduce. For this reason, there are few crickets that cannot make a sound. This is an example of —

• learned behavior

• genetic replication

• natural selection

• selective breeding

The diagram below displays historical changes in the foot of a species of bird. What is a change that has occurred in the bird's foot over time?

• The bird's foot has lost a toe.

• The bird's foot has gained webbing between the toes.

• The bird's foot has doubled in size.

• The bird's foot has gained feathers.

The diagram displays historical changes in the foot of a species of bird. To which type of environment did the bird's foot most likely adapt?

• Aquatic

• Mountainous

• Low temperature

• High temperature