BI-172
Food tests
Biology · Secondary 3 · Medium · Food tests
During photosynthesis, a green plant produces a simple sugar. Which food test can be used to show that this sugar is present in a leaf extract, and what is a positive result?
- Add Benedict’s solution and heat; a brick‑red precipitate forms.
- Add iodine solution; a blue‑black colour appears.
- Add biuret solution; a violet colour appears.
- Add ethanol then water; a cloudy white emulsion forms.
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