Golden rice is a genetically modified crop plant where the incorporated gene is meant for biosynthesis of

Golden rice
$I$. It is a transgenic variety of rice.
$II$. It contains a good 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?

$BT$ cotton is resistant to

The process of $RNA$ interference is used to protect plants from which of the following?

Production of pest-resistant plants could

Which vitamin content was increased in golden rice using biotechnology?