Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The nematode Meloidegyne incognitia infects which part of the tobacco plant, leading to a reduction in yield?
The NCERT book mentions, 'A nematode Meloidegyne incognitia infects the roots of tobacco plants and causes a great reduction in yield.' This highlights the specific target of the nematode.
In RNA interference (RNAi), what is the key molecule directly responsible for silencing a specific mRNA?
The NCERT text states, 'This method involves silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing).'
What is the primary role of the complementary dsRNA molecule in RNA interference (RNAi)?
According to the NCERT text, the dsRNA 'binds to and prevents translation of the mRNA (silencing).'
Which agricultural biotechnology technique is employed to introduce nematode-specific genes into host plants to achieve pest resistance via RNAi?
The context clearly states, 'Using Agrobacterium vectors, nematode-specific genes were introduced into the host plant...'
In the RNAi-based pest resistance strategy for tobacco plants, the introduced DNA was designed to produce which types of RNA in the host cells?
The NCERT text explains, 'The introduction of DNA was such that it produced both sense and anti-sense RNA in the host cells.' These then form dsRNA.
What is the consequence for the nematode parasite when a transgenic host plant expresses specific interfering RNA through RNAi?
The NCERT states, 'The consequence was that the parasite could not survive in a transgenic host expressing specific interfering RNA.'
The source of complementary RNA that can initiate RNAi can be from:
The NCERT text provides, 'The source of this complementary RNA could be from an infection by viruses having RNA genomes or mobile genetic elements (transposons) that replicate via an RNA intermediate.'
Which of the following is a direct benefit of genetically modified (GM) crops, as mentioned in the context, related to pest management?
The NCERT text explicitly states that genetic modification has '(ii) reduced reliance on chemical pesticides (pest-resistant crops).'
How do the sense and anti-sense RNA expressed in the host plant lead to RNAi?
The NCERT material explains, 'These two RNA’s being complementary to each other formed a double stranded (dsRNA) that initiated RNAi...'
The use of Agrobacterium tumifaciens as a vector for gene transfer in plants is based on its natural ability to:
The NCERT states, 'Agrobacterium tumifaciens, a pathogen of several dicot plants is able to deliver a piece of DNA known as ‘T-DNA’ to transform normal plant cells into a tumor...'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.