Iodine test

Definition

A chemical test in which iodine turns blue-black if starch is present and remains yellow-brown if it is not detected.

Used by Edexcel

Specification 1.10 · Paper 1, Paper 2

1
Do not say iodine tests for sugar: it tests for starch. A yellow iodine drop shows that starch is no longer detected in that sample.

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GCSE Biology · key term

A chemical test in which iodine turns blue-black if starch is present and remains yellow-brown if it is not detected.

Used by Edexcel

Specification 1.10 · Paper 1, Paper 2

1
Do not say iodine tests for sugar: it tests for starch. A yellow iodine drop shows that starch is no longer detected in that sample.

Create a free account to read GCSE Biology revision notes for your exam board and track your progress.