BI-1370
Food tests
Biology · Secondary 4 · Medium · Food tests
A student adds iodine solution to four food samples. The results are shown:
Sample 1: stays yellow-brown
Sample 2: turns blue-black
Sample 3: stays yellow-brown
Sample 4: turns blue-black
Which samples contain starch?
Sample 1: stays yellow-brown
Sample 2: turns blue-black
Sample 3: stays yellow-brown
Sample 4: turns blue-black
Which samples contain starch?
- Samples 1 and 3 only
- Samples 2 and 4 only
- Samples 1, 2 and 3 only
- Samples 1, 2, 3 and 4
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