CAIE IGCSE Biology 10.1.13 Passive Immunity
Practise defining passive immunity as short-term protection from antibodies acquired from another individual.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that passive immunity transfers ready-made antibodies rather than stimulating the recipient to make them
- identify placental transfer, breast milk and injected antibodies as passive-immunity examples
- explain that protection is short-lived because antibodies decline and no memory cells are produced
10.1.13—Passive immunity is a short-term question 1
Question (a)
(a)
During pregnancy, antibodies are acquired by the fetus from the mother.
State the organ the antibodies cross to reach the fetus.
[ 1 ]
Question (b)
(b)
A baby was breastfed for six months. The concentration of antibodies in the baby's blood obtained from breast milk and the concentration of antibodies made by the baby itself were measured.
Fig. 6.1 shows the results.
Key: antibodies acquired by the baby from the mother
---- antibodies produced by the baby
[ 4 ]
Question (i)
(i)
Complete the sentences to describe the changes in antibody concentration in the baby.
After birth the concentration of antibodies acquired from the mother decreases rapidly to 0 arbitrary units at months.
Antibodies start being produced by cells called in the baby immediately after birth.
The total concentration of antibodies in the baby from both sources is arbitrary units at 4 months.
The concentration of antibodies acquired from the mother and the concentration of antibodies produced by the baby are the same at months.
[ 4 ]
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