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Biology · 2026 · 5 marks
CBSE 2026 · Region 5 · Set 2 · Q32
(a) (i) Draw the structure of an antibody molecule and label any four of its parts. (ii) Differentiate between active and passive immunity. Write any…
(a)(i)
Draw the structure of an antibody molecule and label any four of its parts.
(ii)
Differentiate between active and passive immunity. Write any three differences.
OR
(b)(i)
(I)
Write the scientific names of the two species of filarial worms causing filariasis.
(II)
How do they affect the body of infected persons ?
(III)
How does the disease spread ?
(ii)
Mention the source and the role of the following in providing defence against infection in the human body :
(I)
Histamine
(II)
Interferons
Marking-scheme solution
(i)
(ii)
| Active Immunity | Passive Immunity |
| When antibodies are produced in our body in response to an antigen then it is called active immunity | When preformed antibodies (readymade) are injected into the body for protection then it is called passive immunity. |
| It is slow and takes time to give its full effective response | It gives quick response |
| It lasts for longer period | It lasts for shorter period |
| Memory cells are formed | Memory cells are not formed |
(i)
(I)
Wuchereria bancrofti , and Wuchereria malayi
(II)
Chronic inflammation of the organs/ swelling in lower limbs / gross deformities
in genital organs.
(III)
Transmitted by the bite of female mosquito vector.
(ii)
(I)
Mast cells, cause allergy
(II)
Virus infected cells, Protect the non-infected cells of our body from viral infections
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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.