BTEC Applied Science Unit 3: Explaining with theory (D17) - worksheet + answers

A complete, ready-to-teach lesson for Unit 3 (Science Investigation Skills): using scientific knowledge to explain why your results came out that way.

Learning objectives:
• Distinguish describing a result from explaining it.
• Use named scientific theory to explain a trend.
• Explain a plateau or an optimum in terms of a limiting factor or denaturation.
• Use correct scientific terminology in an explanation.

What’s included:
• Student worksheet (PDF and editable Word)
• Teacher version with model answers and mark schemes (PDF and editable Word)
• Teacher notes: lesson flow, common misconceptions and practical/safety notes
• Retrieval starter (5 marks)
• Structured tasks with key-idea boxes, data tables and printed graph grids
• Check for Understanding quiz (10 marks) with a confidence self-assessment
• Written-task practice (15 marks) based on an investigation scenario, ending with a levels-marked 6-mark question with indicative content

Specification coverage:
• C · Drawing conclusions and evaluation: explaining the results using relevant scientific theory and terminology.

About 60 minutes of teaching; the written-task section works in class or as homework. All questions are original.

Written for the Pearson BTEC Level 3 Nationals in Applied Science. Not endorsed by Pearson. Single-school licence.