Final EXAM 7th Grade Science

1.

1 point

What is the main function of the
human reproductive system?

To break down food and nourish the body

To allow offspring to be born

To support organs and provides attachment points for muscles

To allow parts of the body to move

2.

1 point

What is the main function of the
muscular system?

To allow the body to exchange gases

To allow hormones to be secreted in different parts of the body

To allow the body to balance and move

To allow blood to circulate throughout the body

3.

1 point

Look at question #2
Look at the energy pyramid.
Energy flows from-

the shark to the small crustaceans

the phytoplankton to the shark to the small crustaceans

the herring to the mackerel to the shark

the herring to the mackerel to the phytoplankton

4.

1 point

Look at question #23

The role of ecological succession is to
allow a habitat to move through
different stages until

Look at the diagram for questions 21-23.

the habitat is home to species of large mammals.

the habitat is home to species that are primarily nocturnal.

the habitat is home to species that can survive industrial pollution.

the habitat is home to species that will be able to survive in the area for a long period of time.

5.

1 point

What is one of the main functions of
the endocrine system?

To allow the body to coordinate the actions of its muscles

To allow the body to distribute blood and lymph

To allow the body to provide support for different tissues

To allow the body to secrete hormones to regulate its growth

6.

1 point

Two friends were taking turns beating
egg whites to a stiff peak. For three
minutes, the first friend beat the egg
whites with a fork. For the next two
minutes, the egg whites sat still. In
the final minute, the second friend
beat the egg whites with a whisk.
When was work performed on the
egg whites?

Work was performed only in the first three minutes and the final minute.

Work was performed only in the first three minutes.

Work was performed for all six minutes.

Work was performed only in the final minute.

7.

1 point

A chloroplast and a vacuole are both
enclosed by membranes, but the two
organelles serve different functions.
Which of the following best describes
how a chloroplast is different from a
vacuole?

A chloroplast transforms light energy, and a vacuole stores water and other substances.

A chloroplast excretes light energy, and a vacuole stores light energy.

A chloroplast transforms water energy, and a vacuole stores water energy.

A chloroplast excretes waste, and a vacuole transforms waste.

8.

1 point

Look at question #10
The diagram shows the human digestive system. Use the diagram and your knowledge of science to answer any questions that follow.

In the stomach, pancreatic juice mixes with food. An enzyme in the juice called rennin divides milk into solid and liquid portions. Pancreatic juice causes milk to undergo

a chemical change.

a physical and chemical change.

neither a chemical nor physical change.

a physical change.

9.

1 point

Look at question # 16
The diagram shows an old garbage dump and the soil beneath it. Use
the diagram and your knowledge of science to answer any questions that follow.

What will occur as a result of garbage being placed on the surface of an old dump?

The groundwater under the dump will reverse direction.

The groundwater under the dump will become polluted.

The groundwater under the dump will become purified.

The groundwater under the dump will dry up.

10.

1 point

Look at question #11
Look at the picture of the human digestive system.
After nutrients have been extracted from food, the remains of the food enter the large intestine. The large intestine then squeezes the remains of the food into the small space of the rectum. In this process, the digested food undergoes

a physical change.

a chemical and physical change.

neither a physical nor chemical change.

a chemical change.

11.

1 point

Look at question #24

Four stages of ecological succession are shown in the diagram for . Use the diagram and your knowledge of science to answer any questions that follow.

What is the result of the changes in this habitat?

The habitat has become less stable because more trees have grown in the area.

The habitat has become more stable because more trees have grown in the area.

The habitat has become less stable trees in the area have grown too large.

The habitat has become more stable because all trees in the area have died.

12.

1 point

Look at question #4
Look at the food web.

Energy flows from-

the grass to the mouse to the snake

the trees to the the hawk to the mountain lion

the rabbit to the hawk to the cricket

the owl to the frog to the mouse

13.

1 point

Look at question #3
Look at the food web

energy flows from-

the minnow to the grey heron to the tadpole

the plant plankton to the tadpole to the diving beetle

the diving beetle to the three-spined stickleback to the minnow

the tadpole to the dragonfly larva to the plant plankton

14.

1 point

Look at question #28

The diagram displays the historical development of the present-day horse.

What is a genetic change that has occurred in the horse over time?

The horse has lost its tail.

The horse has become less muscled.

The horse has increased in size.

The horse has developed four legs.

15.

1 point

What is one of the main functions of
the skeletal system?

To distribute lymph throughout the body

To coordinate the different movements of the body

To provide structure and support for the organs in the body

To break down food into small particles

16.

1 point

Look at question #1
Look at the food web

Energy flows from-

the hawk to the grass to the snake and the rabbit

the grass to the hawk to the rabbit

the grasshopper to the toad to the sparrow

the grass to the grasshopper to the toad

17.

1 point

What is the main function of the
integumentary system?

To break down food for the body

To direct the actions of the body

To protect the inner organs of the body from harm

To remove wastes from the body

18.

1 point

What is one of the main functions of
the excretory system?

To fight disease-causing agents

To remove excess water from the body

To allow a human egg to be fertilized

To secrete hormones throughout the body

19.

1 point

Plant cells have cell walls, while
animal cells have cell membranes.
How do these two organelles differ?

Cell walls tend to be smaller than cell membranes.

Cell walls tend to be more rigid than cell membranes.

Cell walls tend to contain more lipids than cell membranes.

Cell walls tend to contain less cellulose than cell membranes.

20.

1 point

Look at question #27

The diagram shows a dichotomous key that can be used to identify
species of sandpipers from around the world. Use the diagram and your knowledge of science to answer any questions that follow.

What type of sandpiper is pictured below?

Woodcock

Black-tailed godwit

Purple sandpiper

Long-billed curlew