How Do Spiders And Silkworms Make Silk
Spiders produce silk from structures called spinnerets, which are glands at the base of their abdomens. Spiders produce a wide variety of silk and each type has its own particular use. For instance, the strong and elastic silk is used to build the foundation of a web; sticky threads are produced to trap prey; tough and papery silk is used to cover the exterior of the egg sac. And, each kind of silk is extruded in liquid form through tiny “nozzles” collectively located in organs called “spinnerets.” We can see these at the back side of the spider’s abdomen. In general, most spiders have at least two pairs of spinneret containing many silk-producing “spigots.” The silk proteins are oriented in a fashion that renders them a solid fiber, as the spider brushes the liquid silk from the spinnerets. Silkworms produce silk by spewing fibroin through small holes in their jaws. Larvae hatches out of its egg. The larvae eats mulberry leaves. The silkworms use their salivary glands to produce fibroin, and they create their cocoons by rotating repeatedly. To get high silk, we should throw the cocoons into boiling water to kill the silkworm pupa.