William has an allergy that causes problems - VCE - SSCE Biology - Question 4 - 2010 - Paper 1
Question 4
William has an allergy that causes problems. Eight skin-prick tests were carried out to find the source of the problem. A portion of skin was divided into eight squa... show full transcript
Worked Solution & Example Answer:William has an allergy that causes problems - VCE - SSCE Biology - Question 4 - 2010 - Paper 1
Step 1
A. William is allergic to saline.
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Answer
This assertion is incorrect. The results show no positive reaction for saline, indicating that William is not allergic to saline.
Step 2
B. histamine is a negative control.
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Answer
This statement is not supported by the results. Generally, histamine is used as a positive control in allergy tests, indicating that this answer is incorrect.
Step 3
C. William is allowed to keep his cat.
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Answer
This statement is true. Since there is no positive reaction indicated for the cat, it can be concluded that William is not allergic to cats.
Step 4
D. the same allergen is found in a horse and a house dust mite.
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Answer
The results shown do not confirm if the same allergen is present in both a horse and a house dust mite, as there are positive reactions for both. Therefore, this conclusion cannot be definitively made.
