JAMB - Biology (2001 - No. 22)
When specimen X is mixed with few drops of iodine solution, the appearance of a blue-black colour confirms that X is
galactose
starch
sucrose
glucose
הֶסבֵּר
The iodine test is a chemical reaction that detects the presence of starch by turning a solution or food blue-black. Speximen X contains starch