ILEARN Science Investigation 3

Question 1

A scientist observes that plants near a window grow taller than plants in a dark corner. What is the best next step?

Accepted Answer

Form a hypothesis and design a controlled experiment

Answer

An observation leads to a hypothesis, which must then be tested through a controlled experiment.

Question 2

In an experiment testing how fertilizer affects plant height, what is the dependent variable?

Accepted Answer

Height of the plant

Answer

The dependent variable is what is measured — plant height — which depends on the fertilizer amount.

Question 3

A student creates a model of the water cycle. What is the main limitation of using a model in science?

Accepted Answer

Models may not include every detail of the real system

Answer

Models simplify reality and may leave out some details, which is their key limitation.

Question 4

Which safety rule is most important when heating a substance in a test tube?

Accepted Answer

Point the opening away from people

Answer

Pointing the test tube away from people prevents injury if the substance suddenly boils or splatters.

Question 5

A student hypothesizes that adding salt to water will raise its boiling point. After testing, the data does not support the hypothesis. What should the student conclude?

Accepted Answer

The hypothesis was not supported and should be revised

Answer

When data does not support a hypothesis, scientists revise or reject the hypothesis based on evidence.

(ILEARN) Indiana Learning Evaluation Assessment Readiness Network Practice Test

(ILEARN) Indiana Learning Evaluation Assessment Readiness Network Practice Test

ILEARN Science Investigation 3