Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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.'
Which of the following is NOT an immediate adverse effect of drug and alcohol abuse mentioned in the provided text?
The text states: 'The immediate adverse effects of drugs and alcohol abuse are manifested in the form of reckless behaviour, vandalism and violence.' Spontaneous remission is not listed as an immediate adverse effect.
Overdosing due to a combination of drugs or their intake along with alcohol can lead to death due to:
The text mentions: 'doses of drugs may lead to coma and death due to respiratory failure, heart failure or cerebral hemorrhage. A combination of drugs or their intake along with alcohol generally results in overdosing and even deaths.'
Which of the following warning signs of drug and alcohol abuse in youth is related to social behavior?
The text lists: 'deteriorating relationships with family and friends' as a warning sign. The other options relate to personal habits or physical changes.
Addiction is described as a psychological attachment to certain effects often associated with drugs and alcohol. Which of the following is a key characteristic mentioned?
The text defines addiction as: 'Addiction is a psychological attachment to certain effects – such as euphoria and a temporary feeling of well-being – associated with drugs and alcohol.'
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