7th Grade 1st Semester Test Review_2024-25

Front

What does it mean if a population size stays stable?

Back

It means that the number of births is equal to the number of deaths, so the total population size remains constant.

Front

What causes a population size to increase?

Back

A population size increases when the number of births is greater than the number of deaths.

Front

What is a phase in terms of matter?

Back

A phase is a noticeably different form or state of the same substance.

Front

What does an ecologist study?

Back

An ecologist studies the interactions between living things and their environments.

Front

Are the molecules in a solid always moving?

Back

Yes, the molecules in a solid are always moving, even if it's not visible.

Front

What is the definition of a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is an ecosystem?

Back

An ecosystem is a community of living organisms interacting with their physical environment.

Front

What is the role of producers in an ecosystem?

Back

Producers, like plants, create their own food through photosynthesis and provide energy for other organisms.

Front

What is the water cycle?

Back

The water cycle is the continuous movement of water through evaporation, condensation, and precipitation.