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Biology · 2024 · 2 marks
CBSE 2024 · Region 1 · Set 1 · Q20
(a) A farmer while working on his farm was bitten by a poisonous snake. He was rushed to a nearby health centre where the doctor gave him an…
(a)
A farmer while working on his farm was bitten by a poisonous snake. He was rushed to a nearby health centre where the doctor gave him an injection to save his life.
(i)
What did the doctor inject and why ?
(ii)
Name the kind of immunity provided by this injection.
OR
(b)
Why do organic farmers not recommend complete eradication of insect pests? Explain giving reason.
Marking-scheme solution
(i)
-Readymade or preformed antibodies or antitoxins against the snake venom ,
-A quick immune response is required in this case.
(ii)
Passive immunity
The organic farmers hold the view that complete eradication of pests is not only possible
but also undesirable because without them beneficial predatory and parasitic insects which depend upon them as food or hosts will not survive /
One of the key belief of organic farmers is that biodiversity furthers health. Greater biodiversity leads to more sustainable ecosystem.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.