Which ingredient was present in higher concentrations in $GM$ rice as compared to the usual rice?

Gene therapy is an attempt to correct a genetic defect by providing a normal gene into the individual. By this the normal function can be restored. An alternate method would be to provide the gene product (protein/enzyme) known as enzyme replacement therapy, which would also restore the function. Which in your opinion is a better option ? Give reason for your answer.

Which one of the following vectors is used to replace the defective gene in gene therapy ?

Tobacco plant resistant to a nematode have been developed by the introduction of $DNA$ that produces (in the host cells)