CAST Science Practice Test

Front

What is the principle of natural selection?

Back

Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is the chemical symbol for Sodium?

Back

Na

Front

What is a magnetic field?

Back

A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Front

What does it mean for mass to be conserved in a chemical reaction?

Back

It means that the total mass of the reactants equals the total mass of the products in a chemical reaction.

Front

What is the role of a predator in an ecosystem?

Back

Predators help control the population of prey species, maintaining a balance in the ecosystem.

Front

What is the chemical symbol for Oxygen?

Back

O

Front

How can you demonstrate that a magnetic field exists?

Back

You can use iron filings or a small metal object to show the effect of a magnetic field.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is biodiversity?

Back

Biodiversity refers to the variety of life in a particular habitat or ecosystem.

Front

What is the significance of the color of fish in a predator-prey relationship?

Back

The color can affect visibility to predators; darker colors may provide better camouflage in certain environments.