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Biology · 2023 · 2 marks
CBSE 2023 · Region 5 · Set 1 · Q20
(a) (i) Give an example of a genus of virus used as narrow spectrum insecticidal biocontrol agent. (ii) How does its use serve as an aid in overall…
(a)(i)
Give an example of a genus of virus used as narrow spectrum insecticidal biocontrol agent.
(ii)
How does its use serve as an aid in overall integrated pest management programme ?
OR
(b)
Why a malignant tumour considered to be more damaging than a benign tumour ? Explain.
Marking-scheme solution
(a) (i) Nucleopolyhedrovirus
(ii) Species specific, no negative impact on other plants / mammals / birds / fish / non target insects, beneficial insects are conserved, useful for ecologically sensitive area.
OR
(b) Malignant tumor grows very rapidly, and starves the normal cells by competing for vital nutrients, invades and damages surrounding normal tissue , shows metastasis / spread to other body parts or tissues.
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.