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Biology · 2022 · 2 marks
CBSE 2022 · Region 2 · Set 1 · Q3
(a) A person suffering from AIDS dies of opportunistic infections (ARC) i.e., infections that could have been otherwise overcome. (i) State one…
A person suffering from AIDS dies of opportunistic infections (ARC) i.e., infections that could have been otherwise overcome.
(i)
State one reason as to why an 'HIV' patient dies of 'opportunistic infections'.
(ii)
Give the scientific name of one bacterium and one parasite which mainly attack a person suffering from AIDS.
(iii)
Write the full form of the name of the widely used diagnostic test for AIDS.
In spite of the statutory warning on cigarette packets against 'smoking' and its injurious effects on health, smoking is still prevalent in the society. Enumerate four important health hazards to a smoker.
Marking-scheme solution
(a)(i)
Decrease in the number of helper T -lymphocytes / weakened immunity
(ii)
Bacterium- Mycobacterium; Parasite- Toxoplasma
(iii)
Enzyme Linked Immuno-sorbent Assay / Polymerase Chain Reaction
OR
(b)
Increased CO content in blood, reduced concentration of haem bound oxygen / oxygen deficiency in the body, increased incidence of cancers (of lung / urinary bladder / throat), bronchitis, emphysema, coronary heart disease, gastric ulcer, raised blood pressure, increased heart rate.
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.