In Pheretima, cocoons are formed in 14th, 15th and 16th segments. Fertilisation of ova (egg) by the sperm cells occurs within the cocoon, which then slip off the worm and deposited in the soil. These cocoons holds the worm embryos
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.