Question

Bt cotton is not:

• A. A GM plant
• B. Insect resistant
• C. A bacterial gene
• D. expressing systemd. Resistant to all pesticides

Answer 1

The correct option is D expressing systemd. Resistant to all pesticides

GMplant:
Bt cotton is a genetically modified (GM) plant. It contains the cry gene of bacterium Bacillus thuringiensis.

Insect resistant:

• Bt cotton is genetically modified for insect resistance. It contains cry genes from Bacillus thuringiensis which produces the protoxin cry protein.
• This protoxin when ingested by an insect gets converted into the active form of toxin due to the alkaline pH of the alimentary canalwhich solubilizes the protein crystals.
• The activated toxin binds to the surface of the midgut epithelial cells and creates pores that cause swelling and lysis an finaly death of the insect.

Bacterial gene expressing system:
Bt cotton expresses the bacterialcrygene from Bacillus thuringiensis. Thus, it is a bacterial gene expressing system.

Resistant to all pesticides:
Bt toxin is not resistant to pesticides. It is resistant to insects like cotton bollworms and corn borers..

Final answer: Resistant to all pesticides

Summary:
Bt cotton
Bt cotton is a genetically modified plant with insect resistance. It containsthe cry gene of bacterium Bacillus thuringiensis.Thus, it is a bacterial gene expressing system.Bt toxin is not resistant to pesticides. It is resistant to insects like cotton bollworms and corn borers.

Final answer : Resistant to all pesticides