CBSE 2025 · Region 2 · Set 1 · Q15 · 1 mark
Assertion (A) : Streptococcus pneumoniae and Haemophilus influenzae are responsible for causing infectious disease in human beings.
Reason (R) : A healthy person acquires the infection by inhaling the aerosols released by an infected person.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both (A) and (R) are true and (R) is the correct explanation of (A).
Human Health and DiseaseCommon Diseases in HumansUnderstandassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.