What are the various advantages of using genetically modified plants to increase the overall yield of the crop ?

Explain with the help of one example how genetically modified plants can :

$(a) $ Reduce usage of chemical pesticides.

$(b)$ Enhance nutritional value of food crops

The crops having cry genes needs

Golden rice

$I$. It is a transgenic variety of rice

$II$. It contains a goods quality of $\beta$-carotene (provitamin-A)

$III$. $\beta$-carotene is a principal source of vitamin- $A$

$IV$. The grains of the rice are yellow in colour due to $\beta$-carotene. The rice is commonly called golden rice

Which of the statements given above are correct?

List the advantages of recombinant insulin.