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Biology · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 1 · Q20
(a) How does a human body respond when vaccine is introduced into it? It is said that vaccinations are a must for a healthy society. Justify.
(a)
How does a human body respond when vaccine is introduced into it ? It is said that vaccinations are a must for a healthy society. Justify.
OR
(b)
Humans have innate immunity for protection against pathogens that may enter the gut along with food. What are the two barriers in our body that protect it from such pathogens?
Marking-scheme solution
• The human body produces antibodies against the vaccine which would
neutralise the pathogenic agents during actual infection, Vaccines also generate memory B and T cells.
• Vaccination will prevent occurrence of diseases by quickly recognising
the pathogen and producing antibodies hence making society disease free.
Mucus coating of the gastrointestinal tract/ Acid in the stomach /saliva in
mouth
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.