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Test foods for starch, sugar, protein and fat

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-LS1-7, NGSS.SEP 3 · England: KS3 Biology: Nutrition and digestion, GCSE Combined Science: Organisation (required practical: food tests)

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1
Question 1
A food was tested. Iodine: stays orange-brown. Benedict's (heated): stays blue. Biuret: purple. Which nutrients does it contain?
- A. starch and sugar
- B. sugar and protein
- C. starch and sugar and protein
- D. protein
2
Question 2
Why should you wear eye protection when doing the Benedict's test?
- A. Iodine glows in the dark
- B. The food might explode
- C. Benedict's solution is radioactive
- D. It involves heating in a hot water bath and the reagent is an irritant
3
Question 3
A food sample gives this result: Benedict's solution turns brick-red when heated. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
4
Question 4
A food was tested. Iodine: stays orange-brown. Benedict's (heated): stays blue. Biuret: purple. Which nutrients does it contain?
- A. starch
- B. starch and sugar and protein
- C. sugar
- D. protein
5
Question 5
Why should you wear eye protection when doing the Benedict's test?
- A. Iodine glows in the dark
- B. Benedict's solution is radioactive
- C. The food might explode
- D. It involves heating in a hot water bath and the reagent is an irritant
6
Question 6
A food sample gives this result: Benedict's solution turns brick-red when heated. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
7
Question 7
A food was tested. Iodine: stays orange-brown. Benedict's (heated): brick-red. Biuret: purple. Which nutrients does it contain?
- A. sugar and protein
- B. starch and sugar
- C. starch and protein
- D. protein
8
Question 8
A student adds iodine to plain water as well as to the food samples. Why?
- A. to save iodine
- B. to test the water for protein
- C. as a control to compare the colours against
- D. to make the iodine stronger
9
Question 9
A food sample gives this result: ethanol then water gives a cloudy white layer. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
10
Question 10
A food was tested. Iodine: stays orange-brown. Benedict's (heated): stays blue. Biuret: purple. Which nutrients does it contain?
- A. starch and sugar and protein
- B. sugar
- C. starch and protein
- D. protein
11
Question 11
Why must food be ground up and mixed with water before testing?
- A. to change its colour
- B. to make it taste better
- C. so the nutrients dissolve and can react with the reagents
- D. to kill bacteria
12
Question 12
A food sample gives this result: iodine turns blue-black. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
13
Question 13
A food was tested. Iodine: blue-black. Benedict's (heated): brick-red. Biuret: purple. Which nutrients does it contain?
- A. sugar
- B. starch and sugar
- C. starch
- D. starch and sugar and protein
14
Question 14
A student adds iodine to plain water as well as to the food samples. Why?
- A. to make the iodine stronger
- B. as a control to compare the colours against
- C. to save iodine
- D. to test the water for protein
15
Question 15
A food sample gives this result: iodine turns blue-black. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
16
Question 16
A food was tested. Iodine: stays orange-brown. Benedict's (heated): stays blue. Biuret: purple. Which nutrients does it contain?
- A. starch
- B. starch and sugar
- C. starch and sugar and protein
- D. protein

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