Q.1 (A)(ii) The pest-resistant gene inserted in Bt cotton is taken from the bacterium ....................... .
A. Bacillus thuringiensis
B. Lactobacillus
C. Rhizobium
D. Azotobacter
Best answer
Answer: A. Bacillus thuringiensis
Answer: (A) Bacillus thuringiensis
‘Bt’ stands for Bacillus thuringiensis. A gene of this soil bacterium makes a protein that is toxic to the larvae of insect pests such as the bollworm. When this gene is inserted into cotton plants by genetic engineering, the plants make the toxin themselves, so the pests that feed on them die and less pesticide has to be sprayed. Lactobacillus sets milk into curd, while Rhizobium and Azotobacter fix nitrogen.
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