Question

Assertion (A) : The meristems are grown 'in vitro' to obtain virus-free plants from an infected plant. Reason (R) : If the plant is infected with a virus, the roots and the stems are free of virus.

Explain how the process of RNA interference technology is used effectively to prevent infestation of the roots of tobacco plant by the nematode Meloidegyne incognitia.

(a) Mention any two advantages of micropropagation techniques. (b) Write in brief how the process is carried out in the laboratory. (c) Name any two important food plants grown commercially by this method.

Name the process involved in the production of nematode-resistant tobacco plants, using genetic engineering. Explain the strategy adopted to develop such plants.