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Question
Statement 1: Bt Cotton is a transgenic crop which is resistant to pests.
Statement 2: The gene responsible for providing pest resistance to this GM crop is
obtained from the bacteria Agrobacterium tumefaciens.
Statement 1: Bt Cotton is a transgenic crop which is resistant to pests.
Statement 2: The gene responsible for providing pest resistance to this GM crop is
obtained from the bacteria Agrobacterium tumefaciens.
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Solution
The correct option is C Statement 1 is correct but statement 2 is incorrect
Bt cotton is a transgenic GM crop (genetically modified) which is resistant to pests. The cry genes from Bacillus thuringiensis are genetically engineered into the genome of the cotton plant to induce the resistance towards the pests.
The cry gene codes for a crystalline toxic protein which remains in the inactive protoxin mode in the plant cells. Once ingested by the pests, the alkaline pH in their gut activates the toxin.
The active toxin binds to the epithelial cells of the midgut of the insects and creates pores in the gut wall. The insect stops eating at this point and eventually dies due to starvation. The pores also allow normal gut bacteria of the insect to invade and cause infection, leading to the death of the insect.
Agrobacterium tumefaciens is a bacterial plant pathogen which carries the Ti Plasmid or tumour inducing plasmid. The gene responsible for the pest resistance for Bt plants is not obtained from Agrobacterium tumefaciens. Hence statement 1 is correct but statement 2 is not.
Bt cotton is a transgenic GM crop (genetically modified) which is resistant to pests. The cry genes from Bacillus thuringiensis are genetically engineered into the genome of the cotton plant to induce the resistance towards the pests.
The cry gene codes for a crystalline toxic protein which remains in the inactive protoxin mode in the plant cells. Once ingested by the pests, the alkaline pH in their gut activates the toxin.
The active toxin binds to the epithelial cells of the midgut of the insects and creates pores in the gut wall. The insect stops eating at this point and eventually dies due to starvation. The pores also allow normal gut bacteria of the insect to invade and cause infection, leading to the death of the insect.
Agrobacterium tumefaciens is a bacterial plant pathogen which carries the Ti Plasmid or tumour inducing plasmid. The gene responsible for the pest resistance for Bt plants is not obtained from Agrobacterium tumefaciens. Hence statement 1 is correct but statement 2 is not.
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