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Biology · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 2 · Q17
(a) A patient reports a high fever, chills and sweating. His blood shows the presence of a toxic substance. (i) Identify the disease and the…
(a)
A patient reports a high fever, chills and sweating. His blood shows the presence of a toxic substance.
(i)
Identify the disease and the causative organism.
(ii)
Explain why this disease shows recurring pattern of fever.
OR
(b)
Give the microbial source and mode of action of the following bioactive molecules :
(i)
Cyclosporin-A
(ii)
Streptokinase
Marking-scheme solution
(a)(i)
Malaria
Plasmodium vivax / Plasmodium malariae / Plasmodium falciparum
(ii)
A toxin called hemozoin is released from ruptured RBC’s that causes chill and fever recurring every three to four days.
OR
(b)
Bioreactive
molecules
Microbial source
Mode of action
(i)
Cyclosporin A
Trichoderma
polysporum
Immunosuppressive
Agent
in
organ
transplant
(ii)
Streptokinase
Streptococcus
Clot
buster
Removal of clots
from
the
blood
vessels
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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.