CAST Science Practice Test

Front

What are molecules or compounds?

Back

Molecules or compounds are formed when two or more atoms are chemically bonded together.

Front

What happens to the sea urchin population when the kelp population increases?

Back

The sea urchin population decreases.

Front

What does it mean if Layer C is below Layer B in geological terms?

Back

Layer C is older than Layer B.

Front

Why do embryos of different vertebrates look similar?

Back

Some developmental processes are shared by vertebrates, leading to similar appearances in embryos.

Front

What is the relationship between plant height and survival near sea level?

Back

Near sea level, taller plants are better able to survive and reproduce than shorter plants.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.

Front

What is a food web?

Back

A food web is a system of interlocking and interdependent food chains, showing how energy and nutrients flow through an ecosystem.

Front

What is the significance of geological layers?

Back

Geological layers provide information about the Earth's history, including the age of rocks and fossils.

Front

What is embryonic development?

Back

Embryonic development is the process by which an embryo forms and develops, involving cell division and differentiation.

Front

What factors influence plant survival in different elevations?

Back

Factors include sunlight, water availability, temperature, and competition for resources.