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SingaporeBiologyQuick questions
Biological Molecules and Enzymes
Quick questions on Food tests explained: O-Level Biology
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is writing up a result?Show answer
A good result statement names the test, the observation, and the conclusion: for example, "The sample turned blue-black with iodine, so it contains starch." Examiners want the colour change (from and to) and the matching conclusion.
What is not heating Benedict's solution?Show answer
The Benedict's test only works when heated. An unheated test stays blue and looks negative.
What is q1?Show answer
Name the reagent used to test for starch and the positive colour change. [2 marks]
What is q2?Show answer
State the positive result for the protein test and the reagent used. [2 marks]
What is q3?Show answer
Describe how to test a sample for fat. [2 marks]
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