BI-1295
Food tests
Biology · Secondary 4 · Hard · Food tests
A student tests a food sample for starch and for reducing sugar.
She adds iodine solution to part of the sample and Benedict’s solution to another part, then heats the Benedict’s mixture.
Which result shows that starch is present but reducing sugar is absent?
She adds iodine solution to part of the sample and Benedict’s solution to another part, then heats the Benedict’s mixture.
Which result shows that starch is present but reducing sugar is absent?
- Iodine: blue‑black; Benedict’s: blue
- Iodine: brown; Benedict’s: brick‑red
- Iodine: blue‑black; Benedict’s: brick‑red
- Iodine: brown; Benedict’s: blue
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