Cocoon is the stage in which the larva spins silk threads around it, to protect itself from its predators. The larva traps itself inside the cocoon in order to pupate. The color of the cocoon varies, depending upon what the silkworm eats. It can range from white to golden yellow.Click to see full answer. Accordingly, what is cocoon of silkworm?The cocoon is a protective casing spun from silk. – Inside the cocoon, the silkworm changes into a pupa, the stage between larvae and adult moths. – After around two weeks, the pupa emerges from the cocoon as an adult moth. how does a silkworm make a cocoon? Silkworms are the offspring of moths . They spew out thread from tiny holes in their jaws, which they use to spin into their egg-bearing cocoons. This entire production takes a mere 72 hours, during which time they produce between 500-1200 silken threads. Beside this, what is the life cycle of silkworm? Silkworms go through four stages of development, as do most insects: egg, larva, pupa and adult: the adult (imago) stage is the silkworm moth. The larva is the silkworm caterpillar. Since the silkworms (that is the larvae stage) grow so much they must shed their skin four times while growing.What happens inside a silkworm cocoon?When a silkworm has eaten enough, it constructs a cocoon made out of silk fibers, and inside that cocoon it turns into a pupa. After many days, a fully formed adult silkworm moth emerges through a spit-soaked opening in the bottom of a cocoon.