The flow diagram is about Edward Jenner's work on vaccines - Edexcel - GCSE Biology - Question 2 - 2013 - Paper 1
Question 2
The flow diagram is about Edward Jenner's work on vaccines.
Jenner collected pus containing the cowpox virus from the hand of a milkmaid.
He put the cowpox virus in... show full transcript
Worked Solution & Example Answer:The flow diagram is about Edward Jenner's work on vaccines - Edexcel - GCSE Biology - Question 2 - 2013 - Paper 1
Step 1
2(a) Use words from the box to complete the sentences about vaccines.
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Answer
The cowpox virus from the milkmaid caused the boy to become immune to smallpox. His body produced antibodies which stopped the smallpox virus from causing an infection.
Step 2
2(b) Suggest why a parent might decide not to have their child immunised.
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Answer
A parent might be concerned about potential side effects such as allergic reactions or may believe their child is unlikely to catch the disease. Some parents may fear that their child could contract a mild form of the disease from the inoculation.
Step 3
2(c)(i) Draw the curve of best fit on the graph.
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Answer
A smooth curve should be drawn through all the points on the graph, depicting the bacteria growth over time.
Step 4
2(c)(ii) Use your curve of best fit to estimate the number of bacteria at four hours.
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Answer
The estimated number of bacteria at four hours is approximately between 10,000 and 25,000.
Step 5
2(c)(iii) Describe the trend shown in the graph.
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Answer
The trend in the graph shows that the number of bacteria increases over time.
Step 6
2(d) Describe the optimum conditions for the rapid growth of bacteria.
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Answer
The optimum conditions for the rapid growth of bacteria include a warm environment, moist conditions, a correct pH level, and a good supply of nutrients.
