What is the name of the process of rearing of silkworms? 

Sericulture 

The correct answer is option 3. Sericulture.

Out of the choices you provided, the process of rearing silkworms is called sericulture.

Sericulture is the practice of raising silkworms for the production of silk. It involves carefully controlling the environment and feeding the silkworms mulberry leaves to encourage them to spin their cocoons, which are then harvested for the silk fibers.

Cocoon and silk are the end products of sericulture, not the process itself.

Silviculture refers to the cultivation of trees, not specifically silkworms.