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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Water is a good solvent, allowing various biochemical reactions to take place.
Water helps maintain a stable temperature within organisms, which is essential for metabolic processes.
Step 2
What chemical did you use to test the food for starch?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Iodine (solution).
Step 3
Was heat necessary for this test?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
No.
Step 4
How did you know that starch was present?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The presence of starch was indicated by the blue or black colour change.
Step 5
What control did you use in this test?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Water instead of starch.
Step 6
Another food was tested for the presence of protein. What solution was used to test for protein?
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Biuret (solution) or named chemicals.
Step 7
What was the initial colour of the protein-testing solution before you put it on the food?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Blue.
Step 8
Was heat necessary for this test?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
No.
Step 9
What colour indicated that protein was present in the food?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Purple / violet / Pink.
Join the Leaving Cert students using SimpleStudy...
