Which term refers to a nutrient-rich organic matter excreted by earthworms?

Which term refers to a nutrient-rich organic matter excreted by earthworms?

• A. Bristles
• B. Worm cast
• C. Cilia
• D. Suckers

Answer: (B)

Earthworms excrete nutrient-rich organic matter as they digest soil and organic material; this waste product is called a worm cast (also known as worm castings or vermicast). These casts concentrate nutrients and beneficial microbes, acting as a natural fertilizer and soil conditioner that improves structure, drainage, and fertility. The other terms don’t describe this material: bristles are the tiny hairs used for movement, cilia are microscopic hair-like structures on cells, and suckers are attachments some animals use. So the term that fits is worm cast.