Hi,

I hope you are doing good. I think it's an homework for you to be completed by your own.

I can help you with the term silk waste which is a by-product of any  spinning machinery through which silk filaments or fibers passes. It provides very valuable waste materials and its by products such as yarn, pupae, pupae oil etc.

You can write about each of them and show some figures in your answer to illustrate it in a best way in your whole class!

I suggest you to read your notes and watch YouTube to learn more about them.

All the best.