9. (a) Give two reasons why water is important for all living organisms - Leaving Cert Biology - Question 9 - 2012
Question 9
9.
(a) Give two reasons why water is important for all living organisms.
(i)
(ii)
(b) Answer the following questions in relation to food tests that you carried... show full transcript
Worked Solution & Example Answer:9. (a) Give two reasons why water is important for all living organisms - Leaving Cert Biology - Question 9 - 2012
Step 1
Give two reasons why water is important for all living organisms.
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Answer
Water is a good solvent, which allows it to carry nutrients and waste products in organisms.
Water maintains its temperature well, providing a stable environment for biochemical reactions.
Step 2
What chemical did you use to test the food for starch?
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Answer
Iodine solution.
Step 3
Was heat necessary for this test?
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Answer
No.
Step 4
How did you know that starch was present?
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The solution changed to a blue/black colour.
Step 5
What control did you use in this test?
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Answer
Water instead of starch.
Step 6
What solution was used to test for protein?
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Biuret solution or named chemicals.
Step 7
What was the initial colour of the protein-testing solution before you put it on the food?
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Blue.
Step 8
Was heat necessary for this test?
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Answer
No.
Step 9
What colour indicated that protein was present in the food?
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Purple, violet, or pink.
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