Bt cotton is not
1. a GM plant                                           
2. insect resistant
3. a bacterial gene expressing system 
4. resistant to all pesticides

A protoxin is
1. a primitive toxin                         
2. a denatured toxin
3. toxin produced by Protozoa     
4. inactive toxin

The trigger for activation of toxin of Bacillus thuringiensis is

1. acidic pH of stomach
2. high temperature
3. alkaline pH of gut
4. mechanical action in the insect gut