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Biology · 2024 · 3 marks
CBSE 2024 · Region 5 · Set 3 · Q23
(a) "Mother's milk is considered very essential for the new born infant." Justify. (b) What is a 'vaccine'? Explain the principle on which it works.
(a)
"Mother's milk is considered very essential for the new born infant." Justify.
(b)
What is a 'vaccine' ? Explain the principle on which it works.
Marking-scheme solution
(a)
Colostrum (The yellowish fluid) secreted by mother (during the initial days of lactation) has abundant antibodies or IgA to protect the new born baby or to provide passive immunity
(b)
• Vaccine is a preparation of antigenic proteins of pathogen or
inactivated or weakened pathogen.
• When a person is vaccinated the antibodies are produced in the
body against particular antigens would neutralise the pathogenic agents during actual infection, Vaccines also generate memory
B and T cells that recognize the pathogen quickly on subsequent exposure, and overwhelm the invaders with a massive production of antibodies.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.