Question

Test Group 1	Test Group 2	Test Group 3
Pair of ripe apples	One ripe apple, one unripe apple	Pair of unripe apples

Presence of ethylene gas causes fruits to ripen. As fruit ripens, it produces increasing amounts of ethylene. An investigator placed fruit samples sealed containers as shown in the image, and left them for three days. At the end of the time period, the investigator used iodine to test for the presence of starch.
List these in order from highest to lowest starch content.

• A. Group 1, Group 2, Group 3
• B. Group 3, Group 2, Group 1
• C. Group 1, Group 3, Group 2
• D. Group 3, Group 1, Group 2

Answer 1

The correct option is B Group 3, Group 2, Group 1

The iodine test is used to test Starch content. The solution of iodine contains, an aqueous solution of 1.8% iodine and 3.0% potassium iodide, binds with starch, producing a dark color. The fruits which show more stain the fruit shows, the more starch it contains and the less ripe it is.

So the correct option is 'Group 3, Group 2, Group 1.'