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Biology · 2026 · 3 marks
Biotechnology and its ApplicationsBiotechnological Applications in Agriculture3 marksRemembershort answer
CBSE 2026 · Region 5 · Set 2 · Q26
(a) Write the scientific name of the nematode that infects tobacco plants. Also name the part of the plant that it infects. (b) How is Agrobacterium…
(a)
Write the scientific name of the nematode that infects tobacco plants. Also name the part of the plant that it infects.
(b)
How is Agrobacterium used to protect tobacco plants from attack by this pest ?
Marking-scheme solution
(a)
Meloidegyne incognitia
Roots
(b)
By using Agrobacterium vector, Nematode specific genes were introduced into host plant, introduction of DNA produced both sense and anti-sense RNA in the host cells this two RNAs being complementary to each other form a double stranded RNA (ds RNA), that initiated RNAi and thus silenced the specific mRNA of the nematode hence parasite could not survive in transgenic host.
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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.