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CAIE IGCSE Biology 10.1.13 Passive Immunity Is a Short Term Questions

Antibodies passed across the placenta or in breast milk give temporary protection without forming the recipient’s own memory cells.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • explain that passive immunity uses antibodies acquired from another individual rather than antibodies produced by the recipient
  • identify antibody transfer across the placenta, breast milk or injection as routes of passive immunity
  • state that passive immunity is short-term, with declining acquired antibodies and no recipient memory cells

CAIE IGCSE Biology 10.1.13 Passive Immunity Is a Short Term Questions question 1

[Maximum number: 5]

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.

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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