Practice free Biotechnology and its Applications (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following genes controls cotton bollworms?
The NCERT text mentions, 'The proteins encoded by the genes $cryIAc$ and $cryIIAb$ control the cotton bollworms'.
Why does the Bt toxin not kill the Bacillus thuringiensis bacteria that produce it?
The text explains, 'Why does this toxin not kill the Bacillus? Actually, the Bt toxin protein exist as inactive protoxins...'
What is the primary benefit of incorporating Bt toxin genes into crop plants?
The context states, 'Bt toxin gene has been cloned from the bacteria and been expressed in plants to provide resistance to insects without the need for insecticides; in effect created a bio-pesticide.' This directly reduces reliance on chemical pesticides.
Which of the following is an example of a GM plant developed using Bt toxin genes?
The text explicitly mentions, 'Examples are Bt cotton, Bt corn, rice, tomato, potato and soyabean etc.' and later, 'Bt-cotton is one such example, which is being cultivated in some states of our country.'
The Bt toxin is coded by a gene named:
The NCERT states, 'The toxin is coded by a gene named $cry$'.
In the gut of an insect larvae, the Bt toxin crystals are ________ due to alkaline pH.
The context mentions, 'it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.'
Genetic modification has led to 'pest-resistant crops'. This falls under which general advantage of Genetically Modified Organisms?
Under the section 'Genetically Modified Organisms (GMO)', point (ii) states 'reduced reliance on chemical pesticides (pest-resistant crops)'.
Which specific Bt toxin gene controls the corn borer?
The NCERT text specifies, 'that of $cryIAb$ controls corn borer'.
Bt toxins are insect-group specific. This implies that:
The text states, 'The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific.'
The use of Bt toxin genes in plants is described as an example of creating a:
The text explicitly states, 'Bt toxin gene has been cloned from the bacteria and been expressed in plants to provide resistance to insects without the need for insecticides; in effect created a bio-pesticide.'
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