✓ Board-verified
Biology · 2022 · 3 marks
Biotechnology and its ApplicationsBiotechnological Applications in Agriculture3 marksUnderstandshort answer
CBSE 2022 · Region 3 · Set 1 · Q9
What are cry-proteins? With the help of a suitable example, explain how it acts as a biological pesticide.
What are cry-proteins ? With the help of a suitable example, explain how it acts as a biological pesticide.
Marking-scheme solution
Toxic insecticidal proteins/ pro-toxin /crystal proteins produced by cry genes of Bacillus thuringiensis.
e.g., in Bt Cotton / Bt corn/rice / tomato/ soyabean
Bt toxin protein exists as inactive protoxins, which get activated inside the alkaline pH of the gut of insect, causes perforations / swelling / lysis of midgut ultimately killing the insect.
All Biotechnology and its Applications questions2022 question paperNCERT solutions: Biotechnology and its ApplicationsPractice Biotechnology and its Applications →
More from Biotechnology and its Applications
- RNA interference (RNAi) helps in making tobacco-plant resistant to a nematode (Meloidegyne incognitia) Choose the correct option that shows how RNAi…2025
- The most widely used transgenic animal for testing the safety of vaccine before they are used in humans is:2025
- There are two different farm lands, one where Bt-cotton crop was cultivated and the other where non Bt-cotton crop (indigenous) was cultivated.…2022
- (i) What are transgenic animals? (ii) Name the first transgenic cow and state its importance. OR (i) Explain the convention for naming EcoRI. (ii)…2024
- With the help of a storyboard or a flowchart only, explain all the stages of how human insulin is produced through r-DNA technology.2022
- An application of biotechnology in agriculture involves production of pest resistant plants using 'cry' genes from a bacterium, Bacillus…2022
- An application of biotechnology in agriculture involves the production of pest resistant plants, using "cry" gene from a bacterium, Bacillus…2025
- Name the source organism (scientific name) that produces statins. Mention its use in medical field and how does it act.2022
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.