Which substance produces a blue coloration when treated with iodine?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Biology Mcqsbiology-mcqs
Published
11 May 2018
Last updated
28 May 2026

Browse all Biology Mcqs

Choose the correct answer

Explanation

When iodine is added, starch forms a characteristic blue complex, whereas glycogen, cellulose, and other polysaccharides do not produce this blue color.

SolveExam — free MCQs and past papers for Pakistan government job tests. Content is for educational practice only.