The provided diagrams illustrate the complete life cycle of the silkworm, which is a cyclical natural process, alongside the subsequent linear stages involved in the industrial production of silk cloth from silkworm cocoons. Overall, the silkworm undergoes four distinct developmental stages, from egg to moth, over a period of several weeks. Crucially, the cocoons produced during this cycle serve as the primary raw material for a five-stage manufacturing process to create silk fabric. The life cycle commences when a moth lays eggs, typically on a mulberry leaf. After approximately 10 days, these eggs hatch into silkworm larvae, which are shown consuming mulberry leaves for sustenance. This larval stage lasts for 4 to 6 weeks, during which the larvae grow and subsequently spin themselves into a silk thread cocoon, surrounding themselves with the produced silk. Inside this cocoon, the larva undergoes metamorphosis for 3 to 8 days. Finally, after a total of 16 days within the cocoon, a mature moth emerges, thus completing the cycle. Turning to the production of silk cloth, the process begins with the selection of cocoons. These selected cocoons are then boiled in water, a crucial step that softens the silk fibres and makes them easier to unravel. Following this, each cocoon is carefully unwound, yielding a remarkable 300 to 900 metres of silk thread. The individual threads are then twisted together to form a stronger yarn. Optionally, this twisted yarn can be dyed to achieve various colours. The concluding phase involves weaving these prepared threads into the final silk cloth.
Key Vocabulary