7th Grade End of Final Exam | Science

What causes convection currents to occur on Earth?

• cool air rising, warm air sinking

• cool air rising, warm air rising

• warm air rising, cool air sinking

• warm air sinking, cool air sinking

Why are scientists concerned with ozone depletion in the upper atmosphere?

• because it causes greater levels of ground-level ozone

• because it allows ultraviolet radiation to reach Earth’s surface

• because it increases the amount of smog in highly populated cities

• because it decreases global temperatures by decreasing incoming solar radiation

What type of weather is most likely observed in an area when cirrus clouds are present?

• rainy weather

• calm weather

• foggy weather

• stormy weather

Earth’s atmosphere is mainly composed of which gases?

• hydrogen, helium, oxygen, and argon

• nitrogen, oxygen, argon, and carbon dioxide

• nitrogen, hydrogen, argon, and carbon dioxide

• helium, hydrogen, oxygen, and carbon dioxide

In which way are a euglena and a volvox different?

• A euglena is an individual cell, while a volvox is a colony of cells.

• A euglena uses cilia to move, while a volvox uses flagella to move.

• A euglena can make its own food, while a volvox must capture its food.

• A euglena only reproduces sexually, while a volvox only reproduces asexually.

Which function does the nucleus of a cell perform?

• It releases energy for the cell.

• It provides structure for the cell.

• It controls the activity of the cell

• It forms the boundary of the cell

What is one way the respiratory system and the circulatory system work together in the human body?

• The circulatory system takes in nutrients, while the respiratory system delivers oxygen.

• The circulatory system takes in water, and the respiratory system takes in carbon dioxide.

• The respiratory system takes in nutrients, while the circulatory system delivers carbon dioxide to the cells of the body

• The respiratory system takes in oxygen, and the circulatory system delivers the oxygen to the cells of the body.

How do a volvox and an amoeba get their food?

• A volvox uses eyespots, and an amoeba uses cilia to find food.

• A volvox uses photosynthesis, and an amoeba surrounds its food using pseudopods.

• A volvox surrounds its food, and an amoeba uses cilia to find food.

• A volvox uses pseudopods to find food, and an amoeba uses photosynthesis.

Which statement describes the organization of living organisms?

• All organisms are composed of many cells, which are the basic units of structure but do not perform life functions.

• All organisms are composed of one or more cells, which are the basic units of structure and perform essential life functions.

• All organisms are composed of many cells that have basic units with unique structures and functions.

• All organisms are composed of one or more cells with the same shape and purpose but are not the basic units of structure.

How do the digestive system and the circulatory system work together in the human body?

• The digestive system sends electric messages, while the circulatory system responds to the messages.

• The digestive system provides structure for the body, while the circulatory system directs the movement.

• The digestive system removes liquid toxins from the body, while the circulatory system removes solid waste.

• The digestive system extracts nutrients from food, while the circulatory system transports those nutrients.