The protein products of the following Bt toxin genes cry I Ac and cry II Ab are responsible for controlling

(1) bollworm

(2) roundworm

(3) moth

(4) fruit fly

Cultivation of Bt cotton has been much in the news. The prefix Bt means

(1) "Barium-treated" cotton seeds

(2) "Bigger thread" variety of cotton with better tensile strength

(3) produced by "biotechnology" using restriction enzymes and ligases

(4) carrying an endotoxin gene from Bacillus thuringienesis.

Bt toxin does not harm

Bt toxin is harmful to insects like:

(1) Lepidoterans (tobacco budworm, armyworms)

(2) Coleopterans (beetles)

(3) Dipterans (flies and mosquito)

(4) All are correct

In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to 

(1) Alkaline pH of the insect gut

(2) acidic pH of the insect gut

(3) action of gut microorganisms

(4) presence of conversion factors in insect gut

What is true about Bt toxin?

1. The inactive protoxin gets converted into active form in the insect gut

2. Bt protein exists as active toxin in the Bacillus

3. The activated toxin enters the ovaries of the pest to sterilize it and thus prevent its

multiplication

4. The concerned Bacillus has antitoxins

Bacillus thuringiensis (Bt) strains have been used for designing novel -

1. Bioinsecticidal plants

2. Bio-mineralization processes

3. Biofertilizers

4. Bio-metallurgical techniques

The activated Bt toxin binds to

The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an

(1) indicator of water pollution

(2) insecticide

(3) agent for production of dairy products

(4) source of industrial enzyme

B. thuringienesis produces protein…..during …..their life cycle.
1. Solution, specific phase of
2. Crystal, specific phase of
3. Crystal, all through
4. Solution, all through