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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Date
Score/ 16
Question 1
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)
Question 2
A Benedict's test turns green, not brick-red. What does this suggest?
- A. there is lots of protein
- B. there is lots of sugar
- C. the food is starch only
- D. only a small amount of sugar is present
Question 3
A food was tested. Iodine: stays orange-brown. Benedict's (heated): brick-red. Biuret: purple. Which nutrients does it contain?
- A. starch
- B. sugar and protein
- C. starch and sugar
- D. protein
Question 4
A food sample gives this result: biuret solution turns purple. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
Question 5
A student adds iodine to plain water as well as to the food samples. Why?
- A. as a control to compare the colours against
- B. to test the water for protein
- C. to make the iodine stronger
- D. to save iodine
Question 6
A food was tested. Iodine: blue-black. Benedict's (heated): stays blue. Biuret: stays blue. Which nutrients does it contain?
- A. sugar and protein
- B. starch and sugar
- C. starch
- D. sugar
Question 7
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)
Question 8
A Benedict's test turns green, not brick-red. What does this suggest?
- A. there is lots of protein
- B. the food is starch only
- C. only a small amount of sugar is present
- D. there is lots of sugar
Question 9
A food was tested. Iodine: blue-black. Benedict's (heated): stays blue. Biuret: purple. Which nutrients does it contain?
- A. starch and sugar and protein
- B. sugar and protein
- C. starch and protein
- D. protein
Question 10
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)
Question 11
Why must food be ground up and mixed with water before testing?
- A. to change its colour
- B. to kill bacteria
- C. so the nutrients dissolve and can react with the reagents
- D. to make it taste better
Question 12
A food was tested. Iodine: stays orange-brown. Benedict's (heated): stays blue. Biuret: purple. Which nutrients does it contain?
- A. sugar and protein
- B. starch and sugar
- C. protein
- D. starch
Question 13
A food sample gives this result: biuret solution turns purple. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
Question 14
Why must food be ground up and mixed with water before testing?
- A. to make it taste better
- B. so the nutrients dissolve and can react with the reagents
- C. to kill bacteria
- D. to change its colour
Question 15
A food was tested. Iodine: blue-black. Benedict's (heated): brick-red. Biuret: purple. Which nutrients does it contain?
- A. starch and sugar
- B. starch and protein
- C. starch
- D. starch and sugar and protein
Question 16
A food sample gives this result: biuret solution turns purple. Which nutrient is present?
- A. starch
- B. sugar (reducing sugar)
- C. protein
- D. fat (lipid)
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