Practicing Success
Practicing Success
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Assertion: Tobacco plant yield is highly reduced because of damage to roots. |
Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A. Both Assertion (A) and Reason (R) are correct but R is not the correct explanation of A. Assertion (A) is true but Reason (R) is not correct. Both Assertion (A) and Reason are false (F ). |
Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A. |
The correct answer is Option (1) – Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A. Several nematodes parasitise a wide variety of plants and animals including human beings. A nematode Meloidegyne incognitia infects the roots of tobacco plants and causes a great reduction in yield. A novel strategy was adopted to prevent this infestation which was based on the process of RNA interference (RNAi). RNAi takes place in all eukaryotic organisms as a method of cellular defense. This method involves silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing). 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. |
