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Biology · 2026 · 3 marks
CBSE 2026 · Region 3 · Set 3 · Q27
Study the following cases: Case I: A person bitten by a rabid dog is immediately given an injection of antitoxin for rabies. Case II: A child is…
Study the following cases : Case I: A person bitten by a rabid dog is immediately given an injection of antitoxin for rabies. Case II : A child is given rabies vaccine as a preventive measure.
(a)
Identify the type of immunity provided in both the cases.
(b)
Differentiate between the two types of immunity.
(c)
What is a vaccine? How does it help in preventing a disease?
Marking-scheme solution
(a)
Case I- Passive Immunity (Read made antibodies are given)
Case II- Active Immunity (vaccine stimulates body to produce its own antibodies)
(b)
| Active immunity | Passive immunity |
| Body produces antibodies. / Long term protection. | Readymade antibodies given. / Immediate short term protection. |
(c)
•
It is a preparation of weakened or inactivated pathogens or their antigens
•
It stimulates the body immune system to produce antibodies and memory cells/ preparing the body to fight with the pathogen and provide immunity thus preventing a disease.
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.