Question 1
Grade 12 Biology entrance exam, 2008 E.C. (2016)
Which of the following food types would most likely give a negative result upon addition of iodine solution?
- A.Bread
- B.Butter
- C.Biscuit
- D.Potato
Show the answer and explanation
Answer: B Butter
Why
Iodine solution is used to test for starch, turning blue-black in its presence. Bread, biscuit, and potato are rich in starch, whereas butter is a lipid and does not contain starch, yielding a negative result.


