question_answer 22)

  Use of certain chemicals and radiation to change the base sequences ofgenes of crop plants is termed (a) recombinant DNA technology                             (b) transgenic mechanism (c) mutation breeding                                                    (d) gene therapy

Answer:

                    (c) It is possible to induce mutations artificially in crop plants through the use of chemical So radiations (like gamma radiations), and then selecting and using those plants that have the desirable character as a source in breeding. This process is called mutation breeding. Use of radiations is not involved in other three options. Recombinant DNA technology involves transferring of a desired gene (transgene) from an organism and incorporating it to host organism by genetic engineering to produce a recombinant to gene therapy is performed mainly in humans. It involves replacing a defective gene with a normal one.