Grade 8 Science Unit 2 | Practice Workbook

Grade 8 Science Unit 2 | Practice Workbook

Download the fillable and printable workbook (PDF). Save work privately. Read each matching lesson for the hypothetical scenarios and data.

Day 1: Classification and evidence

1. Name two shared arthropod features.
2. How many legs does a typical adult insect have?
3. How many legs does a spider have?
4. Are all arthropods insects?
5. What observable trait helps separate butterflies in the classroom key?
6. What trait helps identify a beetle in that limited key?
7. Why might an immature animal not fit the key?
8. State one limitation of the classroom key.

Day 2: Adaptations and ecological relationships

1. Give one function of grasshopper hind legs.
2. Is an adaptation a deliberate choice by an individual?
3. What is pollination?
4. Do all plants rely on insects for pollination?
5. Does every flower visit guarantee pollination?
6. In a food web, what does an arrow from a plant to an insect represent?
7. Name one limitation of a simplified food web.
8. Why should a predicted population change be labeled a prediction?

Day 3: Fair tests and variables

1. Identify the independent variable in the hypothetical comparison.
2. Identify the dependent measure.
3. Name one condition to keep comparable.
4. Why repeat observations across days?
5. Name one possible confounding factor.
6. Does a visit count necessarily equal a count of unique insects?
7. Why does a comparison not automatically prove cause?
8. State one safety rule.

Day 4: Interpreting data and uncertainty

1. List area A values.
2. Calculate the mean for A.
3. Calculate the mean for B.
4. Find the range for A.
5. Find the range for B.
6. What is the difference between the means?
7. Are these values real observations?
8. Name one reason the example does not prove a universal rule.

Day 5: Independent science assessment

1. How many legs does a typical adult insect have?
2. Name one way to distinguish a spider from an adult insect.
3. What does a food-web arrow from plant to insect represent?
4. Identify the dependent measure in the hypothetical garden test.
5. Find the mean of 6, 8 and 10 visits.
6. Find the range of 3, 5 and 7 visits.
7. Name one uncontrolled factor in the comparison.
8. Explain in two sentences why the hypothetical results cannot prove what happens in every garden.

Separate teacher guide and answer key