What process involves forming silk yarn by reeling filaments from cocoons and adding a slight twist?

The process of forming silk yarn by reeling filaments from cocoons and adding a slight twist is accurately referred to as throwing. Throwing is a specific technique used in the silk industry where the long, continuous strands of silk are twisted together to create a stronger yarn suitable for weaving. This method involves taking raw silk filaments directly from silkworm cocoons and then mechanically twisting them to achieve the desired thickness and strength.

While twisting, spinning, and plying are terms that relate to yarn formation in various contexts, they don’t capture the unique process associated with silk. Twisting typically refers to rotating fibers together but not in the specific context of silk production. Spinning generally describes the broader practice of turning fibers into yarn, which can involve various materials, while plying refers to the process of twisting two or more strands of yarn together to create a thicker, more textured fabric. In contrast, throwing is uniquely associated with the production of silk yarn from cocoons, making it the most appropriate answer for this question.