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2.2 Animal tissues, organs and organ systems

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Question 105
F

A student wants to investigate how pH affects the rate at which amylase breaks down starch.

The student has amylase solution, starch solution, buffer solutions at pH 4, pH 6, pH 8 and pH 10, iodine solution, a spotting tile, a dropping pipette, a water bath, a stopwatch and standard laboratory glassware.

Describe a method the student could use. You should include:

  • how the student would measure the rate of starch breakdown at each pH
  • how the student would make sure the investigation is a fair test.
[6]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

179 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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