Bt Toxin

Q. Cry I Ab controls infestation of

1. Root pest
2. Corn Borer
3. Stem Borer
4. Cotton Bollworm

Q. The prefix “Bt” in Bt cotton means

1. “Barium treated” cotton seeds
2. “Bigger thread” variety of cotton with better tensile strength
3. Carrying an endotoxin gene from Bacillus thuringiensis
4. Produced by “biotechnology” using restriction enzymes and ligases

Q. Cry I Ab and cry II Ab produce toxins that control

1. Corn borer and tobacco budworms respectively
2. Cotton bollworms and corn borer respectively
3. Nematodes and tobacco budworms respectively
4. Tobacco budworms and nematodes respectively

Q. Bt toxin produced by Bt cotton plant gets activated in:

1. Midgut of insect by alkaline pH
2. Mouth of insect by alkaline pH
3. Midgut of insect by acidic pH
4. Mouth of insect by acidic pH

Q. Bt toxin is obtained from

1. Bacillus subtilis
2. Aspergillus niger
3. Escherichia coli
4. Bacillus thuringiensis

Q. In Bt cotton, a transgenic plant, Bt is used for the purpose of conferring:

1. High lysine (essential amino acid) content
2. Insect resistance
3. High protein content
4. High vitamin-A content

Q. Cry genes introduced in a plant will not be affective against

1. hymenoptera
2. rodents
3. coleopterans
4. Lepidoptera

Q. The trigger for activation of toxin of Bacillus thuringiensis is:

1. Alkaline pH of gut
2. Mechanical action in the insect gut
3. Acidic pH of stomach
4. High temperature

Q. What is true about Bt toxin?

1. all of these
2. Bt protein exists as active toxin in Baccillus
3. The inactive pro-toxin gets converted into active form in the insect gut.
4. 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 __.