Unit 1 Review: Life, Science, and How We Know

Lesson Goal

Bring the four Unit 1 lessons together and practice the distinction the unit was built on: what you observed is not the same as what you think caused it.

Key Concepts

The scientific method is a procedure for testing a guess rather than trusting it: observe, ask, hypothesize, test, examine evidence, conclude.

A hypothesis is a possible explanation that can be tested. A theory explains and a law describes, and a theory does not eventually turn into a law. They have different jobs.

Spontaneous generation sounded reasonable and was wrong. Biogenesis, the principle that living things come from other living things, is what the evidence supported.

Where Students Get Stuck

🚨 The hardest one in this unit is theory against law, and the wrong model is that a theory is promoted to a law once it is proven. Keep returning to what each one is FOR: a theory explains why, a law describes what reliably happens.

The second stumble is treating a reasonable-sounding idea as a finding. Maggots appearing on meat is exactly that, and it is why Redi is in this review.

Teaching Suggestion

Do the two plants out loud before reading. Ask what he actually saw, then ask what he thinks caused it, and write the two answers in two places. The gap between those two columns is the whole lesson.

This is a diagnostic, not a test. Every question's hint names the lesson to reopen, so treat a wrong answer as a pointer rather than a score.

Try It Yourself

Grow lima beans in a jar with paper towels and water. The student makes observations, asks a question, forms a hypothesis, collects evidence and records what happens. Use the Lima Bean Experiment worksheet for the activity.

Key Vocabulary

Organism

A living thing.

Homeostasis

The ability to maintain relatively stable conditions inside an organism.

Adaptation

An inherited characteristic that helps an organism survive.

Spontaneous Generation

The old belief that living things could naturally come from nonliving material.

Biogenesis

The principle that living things come from other living things.

Scientific Method

A process for investigating questions using observation, testing, and evidence.

Hypothesis

A possible explanation that can be tested.

Controlled Experiment

A test designed to see how changing one factor affects the result.

Evidence

Information gathered through observation, measurement, or testing.

Theory

A broad explanation supported by a large amount of evidence.

Law

A description of a consistent pattern or relationship observed in nature.

Technology

Using knowledge to solve problems or accomplish tasks.