Bt Toxin
Trending Questions
Q. Cry I Ab controls infestation of
- Root pest
- Corn Borer
- Stem Borer
- Cotton Bollworm
Q. The prefix “Bt” in Bt cotton means
- “Barium treated” cotton seeds
- “Bigger thread” variety of cotton with better tensile strength
- Carrying an endotoxin gene from Bacillus thuringiensis
- Produced by “biotechnology” using restriction enzymes and ligases
Q. Cry I Ab and cry II Ab produce toxins that control
- Corn borer and tobacco budworms respectively
- Cotton bollworms and corn borer respectively
- Nematodes and tobacco budworms respectively
- Tobacco budworms and nematodes respectively
Q. Bt toxin produced by Bt cotton plant gets activated in:
- Midgut of insect by alkaline pH
- Mouth of insect by alkaline pH
- Midgut of insect by acidic pH
- Mouth of insect by acidic pH
Q. Bt toxin is obtained from
- Bacillus subtilis
- Aspergillus niger
- Escherichia coli
- Bacillus thuringiensis
Q. In Bt cotton, a transgenic plant, Bt is used for the purpose of conferring:
- High lysine (essential amino acid) content
- Insect resistance
- High protein content
- High vitamin-A content
Q. Cry genes introduced in a plant will not be affective against
- hymenoptera
- rodents
- coleopterans
- Lepidoptera
Q. The trigger for activation of toxin of Bacillus thuringiensis is:
- Alkaline pH of gut
- Mechanical action in the insect gut
- Acidic pH of stomach
- High temperature
Q. What is true about Bt toxin?
- all of these
- Bt protein exists as active toxin in Baccillus
- The inactive pro-toxin gets converted into active form in the insect gut.
- The activated toxin enters the ovaries of the pest to sterilise it
Q. Bt-cotton produces a toxic protein which is encoded by the Cry gene which was obtained from the bacterium __ .