Bombyx mori is widely used for silk production. It is best described as which of the following?

• A. Silkworm
• B. Bee
• C. Moth
• D. Fly

Answer: (B)

The main idea is that the term silkworm identifies the larval stage of Bombyx mori that actually produces silk. In silk production, farmers raise the caterpillar, which spins a cocoon from silk fibers it secretes, and that cocoon yields the raw silk. While Bombyx mori is a moth in its adult form, the description that matches its role in silk farming is silkworm, because it emphasizes the life stage responsible for producing silk. The other options don’t fit the context: a bee is a honey-producing insect, a fly belongs to a different group with no silk relevance, and calling it a moth doesn’t highlight the silk-producing larval stage.