What are mulberry leaves primarily used for?

$A$ : Sericin is a gummy substance which is usually retained in case of silk till the yarn or fabric stage.
$R$ : Sericin gives protection during processing.

Mulberry, munga, oak and tussar, all the four varieties of silk are present in a single country. The country is

From which of the following is silk obtained?

What is the botanical name of mulberry?

The insect that is not found in the wild state is