# Life Sciences Paper 1, November 2024, question 3.3.1

> A researcher studied how the hormone thyroxine affects the resting heart... Marked mark by mark. Q3.3.1, Life Sciences Paper 1 November 2024, 2 marks.

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Last updated: 2026-11-12

Subject: Life Sciences. Source: Based on Nov 2024 · Paper 1 · Q3.3.1. Marks: 2. Not yet checked by a teacher.

## Question 3.3.1 (2 marks)

A researcher studied how the hormone thyroxine affects the resting heart rate of rats. She placed 12 rats in each of two groups. Group P received daily injections of thyroxine for two weeks. Group Q was given daily injections of a salt solution with no thyroxine. All other conditions were the same for both groups. State the purpose of Group Q in this investigation.

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