Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Chronic use of drugs and alcohol is known to damage which two major organ systems, potentially leading to conditions like cirrhosis?
The NCERT text mentions: 'The chronic use of drugs and alcohol damages nervous system and liver (cirrhosis).'
Which of the following is a measure stated for the prevention and control of alcohol and drug abuse among adolescents?
The NCERT text highlights: 'Parenting that combines with high levels of nurturance and consistent discipline, has been associated with lowered risk of substance (alcohol/drugs/tobacco) abuse.'
Why is adolescence considered a 'vulnerable phase' in an individual's development regarding substance abuse?
The NCERT text defines adolescence as 'a very vulnerable phase of mental and psychological development of an individual,' characterized by 'Curiosity, need for adventure and excitement, and experimentation,' which motivate youngsters towards drug and alcohol use.
Which of the following insect groups is NOT typically targeted by Bt toxin produced from Bacillus thuringiensis?
The context states, 'Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes).' Hymenopterans are not mentioned as a target group.
The Bt toxin protein exists as an inactive protoxin within Bacillus thuringiensis. What condition in the insect gut is responsible for its activation?
According to the text, 'the Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.'
What is the primary mechanism by which activated Bt toxin kills the insect?
The context clearly states, 'The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.'
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.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.