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Biology · 2022 · 3 marks
CBSE 2022 · Region 2 · Set 1 · Q8
(a) Name and state the type of immunity that acts as a 'biological shield' to the developing foetus against many infections in the mother's womb. (b)…
(a)
Name and state the type of immunity that acts as a 'biological shield' to the developing foetus against many infections in the mother's womb.
(b)
A large proportion of infants remain free from potent infections at least three months after birth, or even longer if breast fed. Explain, giving suitable reasons.
Marking-scheme solution
a) ● Passive immunity
when readymade antibodies are directly given to protect the body against foreign agents
b) The yellowish fluid colostrum secreted by mothers during initial days of lactation, abundant antibodies (IgA) to protect the infant.
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.