Claim, Evidence, Reasoning in Science
A Grade 8 science worksheet focusing on developing skills in constructing scientific explanations using Claim, Evidence, and Reasoning.
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Claim, Evidence, Reasoning in Science
Name:
Date:
Score:
Read each scenario carefully. For each scenario, identify the Claim, provide relevant Evidence, and explain your Reasoning.
What is CER?
• Claim: A statement or conclusion that answers the original question/problem.
• Evidence: Scientific data that supports the claim. This can be observations, measurements, or other data.
• Reasoning: A justification that links the evidence to the claim. It shows why the data counts as evidence by using scientific principles.
Scenario 1: A student sets up an experiment to see if plants grow taller with more sunlight. Plant A receives 8 hours of sunlight daily and grows 15 cm in two weeks. Plant B receives 4 hours of sunlight daily and grows 7 cm in two weeks. Both plants were given the same amount of water and soil.
1. Claim:
2. Evidence:
3. Reasoning:
Scenario 2: A scientist observes two ice cubes of the same size. Ice cube X is placed on a metal plate, and ice cube Y is placed on a wooden plate. After 10 minutes, ice cube X has melted significantly more than ice cube Y.
1. Claim:
2. Evidence:
3. Reasoning:
Scenario 3: Examine the image below showing different methods of seed dispersal.
Based on the image, what claim can you make about how dandelion seeds are dispersed?
1. Claim:
2. Evidence:
3. Reasoning:
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