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CAIE A-Level Biology 2.1.2 Iodine Test for Starch Question Bank

Practise iodine-test questions by adding iodine solution, recognising blue-black starch positives and interpreting brown or orange negatives in enzyme contexts.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • add iodine solution to test for starch and record the colour without using Benedict’s heating
  • interpret blue-black or purple-black iodine as evidence that starch or amylose is present
  • use brown, orange or yellow-brown iodine results to follow starch breakdown by enzymes

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