Question 1
Joshua caught the flu and his body slowly produced antibodies to fight the virus.
A few months later, Joshua was given a vaccine for the same virus. This time, his
body responded much faster and made more antibodies. The graph below shows
the two immune responses X and Y of Joshua following two occurrences.
a. What are two things/occurrences that can make Joshua’s body produce
antibodies? [1 mark]
b. Why does not Joshua get the symptoms after getting vaccinated? [1 mark]
c. How is Joshua’s second response Y different from his first response X?
[1 mark]
d. Even when Joshua’s antibody level goes down, how can his body still fight
the virus in the future? [1 mark]
A few months later, Joshua was given a vaccine for the same virus. This time, his
body responded much faster and made more antibodies. The graph below shows
the two immune responses X and Y of Joshua following two occurrences.
a. What are two things/occurrences that can make Joshua’s body produce
antibodies? [1 mark]
b. Why does not Joshua get the symptoms after getting vaccinated? [1 mark]
c. How is Joshua’s second response Y different from his first response X?
[1 mark]
d. Even when Joshua’s antibody level goes down, how can his body still fight
the virus in the future? [1 mark]