Silkworms make silk by spewing a substance called fibroin through small holes in their jaws called spinnerets. The spewed-out substance consists of digested leaves and protein produced by the worm. The silkworm produces up to 1200 silken threads within a 72 hour time period, creating a soft, silver cocoon. Once the cocoon process is complete, silk farmers harvest the threads with steam, and the delicate fibers are spun and woven into silk fabrics.Continue Reading
Silkworms use their salivary glands to produce fibroin, and they create their cocoons by rotating repeatedly for up to 72 hours. Each cocoon produces approximately one kilometer of silk fiber. Silk farmers remove the cocoon with steaming water and carefully unwind the cocoon fibers.
Silkworm farmers harvest silkworm eggs by incubating them until they hatch into caterpillars. The larvae are fed mulberry leaves and lettuce for approximately six weeks. While silkworms feed on a variety of plant life, their favorite meal is mulberry leaves. Silkworm larvae that is fed only mulberry leaves during the feeding process are known to produce the finest silk on the market. During this time, the silkworm eats 50,000 times its weight in plant materials. Once the silkworm reaches a maximum weight and height, it changes color and prepares to spin its cocoon.Learn more about Worms
According to the biology department of the State University of New York, roundworms have bilateral symmetry. Bilateral symmetry means that one vertical cut can split the animal into two equal halves.Full Answer >
Worms are decomposers, as are slugs, bacteria, snails and fungi-like mushrooms, according to St. John Fisher College. SFGate states that earthworms are an example of a worm that acts as a decomposer.Full Answer >
Annelids eat with a mouth that is located on the underside of the head. The mouth connects to an unsegmented gut that runs the length of the worm. The gut terminates at the anus, located at in the pygidium area at the end of the worm.Full Answer >
Earthworms do not have eyes, but they are equipped with cells that can sense changes in the intensity of light as well as cells that can respond to and measure touch. Earthworms are very primitive organisms who do not need to depend on sight to feed as they spend their lives simply moving through the soil and getting their nutrients from it.Full Answer >