Scientific hypotheses, theories, and evidence are central to how scientists explain the natural world. This Grade 6 Science worksheet explores how testable hypotheses differ from scientific theories and laws, how observations and data help evaluate explanations, and how evidence-based arguments support scientific claims. Students practise distinguishing scientific ideas from personal opinions and considering competing interpretations through logical reasoning.

From a Testable Idea to a Scientific Explanation

The reading passage introduces the role of investigations in scientific thinking. Students examine a plant-growth hypothesis involving sunlight, the theory of plate tectonics, and the purpose of scientific laws. These examples clarify that a hypothesis is a proposed explanation that can be tested, a theory explains many observations and results, and a law describes a consistent pattern in nature. The passage also explains why theories do not simply become laws after enough evidence is collected.

Students explore what scientists do when results conflict with a prediction, why repeated investigations and independent evidence matter, and how reasoning connects evidence to a claim. Respectful discussion of alternative explanations reinforces the importance of evaluating data rather than relying on personal opinions.

What Students Practise

• Multiple-choice questions: Identify testable hypotheses, select suitable investigations, distinguish theories from laws, and recognise strong scientific claims and supporting evidence.
• True-or-false statements: Check understanding of testing hypotheses, revising explanations, scientific theories and laws, and respectful evidence-based discussion.
• Short-answer responses: Explain differences between hypotheses and theories, decide how to respond when plant-growth results do not support a prediction, and describe how to discuss competing explanations scientifically.
• Labeled diagram, categorizing activity, and short note: Provide additional opportunities to organize and record learning about the lesson concepts.

Included with the Worksheet

• Printable Grade 6 Science worksheet focused on investigations, evidence, and scientific reasoning.
• Separate PDF answer key for checking student responses.
• Student Notes lines at the bottom of the worksheet for recording key ideas.
• Teacher Guide inside the Answer Key PDF, including Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Practical Ways to Use This Resource

Use the worksheet during a lesson on scientific investigations, as guided practice after introducing hypotheses and scientific explanations, or as independent review of evidence-based reasoning. The plant-growth scenario gives students a concrete situation to analyse when considering predictions, investigation results, and next steps. The plate tectonics example provides a connection to an established scientific theory.

The response tasks also create opportunities to discuss how scientists evaluate disagreement: students must consider which evidence supports a claim, whether an explanation fits the results, and why a conclusion may need revision. The separate answer key supports review, while the teacher guide helps prepare explanations and address common misconceptions, especially the mistaken idea that scientific theories eventually turn into laws.

Designed for Grade 6 Science within the Texas Science 6 lesson topic Investigations, Evidence and Systems, this resource names TEKS as the supplied framework without claiming a specific standard code or verified alignment. It gives teachers a focused way to practise scientific vocabulary, evaluate explanations, and build clearer evidence-based arguments.