The main ingredient in a sports drink is water - Leaving Cert Biology - Question 7 - 2009
Question 7
The main ingredient in a sports drink is water.
(i) Give one reason why the body needs water.
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(ii) Give one way... show full transcript
Worked Solution & Example Answer:The main ingredient in a sports drink is water - Leaving Cert Biology - Question 7 - 2009
Step 1
(i) Give one reason why the body needs water.
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Answer
Water is essential for various bodily functions; it acts as a solvent for biochemical reactions, helps regulate body temperature, and maintains cell structure. For example, it is crucial for processes such as digestion and nutrient transport.
Step 2
(ii) Give one way in which water is lost from the body.
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Answer
Water is lost from the body primarily through sweating, a process that helps regulate body temperature, especially during physical activity.
Step 3
(i) Name the test or name the chemical used to test the sports drink for the presence of glucose (reducing sugar).
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Answer
The test used to detect glucose in a sports drink is the Clinistix test, which utilizes a reagent strip that reacts with reducing sugars.
Step 4
(ii) If glucose is present in the drink, what colour change would you expect to see? In your answer give the initial and final colour of the test solution.
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Initially, the test solution is orange; upon the presence of glucose, the colour changes to blue or red, indicating a positive result.
Step 5
(iii) Is heat necessary for this test?
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Answer
No, heat is not necessary for the Clinistix test.
Step 6
(i) Name the test or give the chemicals used to test the sports drink for the presence of protein.
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Answer
The Biuret test is used for detecting proteins; it requires the addition of sodium hydroxide and copper sulfate.
Step 7
(ii) If protein is present in the drink, what colour change would you expect to see? In your answer give the initial and final colour of the test solution.
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Answer
The initial colour of the Biuret test solution is blue, and it changes to violet or lilac in the presence of protein.
Step 8
(iii) Is heat necessary for this test?
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Answer
No, heat is not necessary for the Biuret test.
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