8th Science STAAR Practice

Front

What is the scientific method?

Back

A systematic process for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.

Front

Define hypothesis.

Back

A testable prediction about the relationship between two or more variables.

Front

What is a variable in an experiment?

Back

Any factor, trait, or condition that can exist in differing amounts or types.

Front

What is the difference between independent and dependent variables?

Back

Independent variables are manipulated by the researcher, while dependent variables are measured to see how they are affected.

Front

What is a control group?

Back

A group in an experiment that does not receive the treatment and is used as a benchmark to measure how the other tested subjects do.

Front

Define ecosystem.

Back

A community of living organisms and their interactions with their environment.

Front

What is photosynthesis?

Back

The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.

Front

What is the role of producers in an ecosystem?

Back

Producers, such as plants, create their own food and provide energy for other organisms in the ecosystem.

Front

What is a food chain?

Back

A linear sequence of organisms through which nutrients and energy pass as one organism eats another.

Front

Define biodiversity.

Back

The variety of life in the world or in a particular habitat or ecosystem.