The excretory system in annelids is consisted of tubes called? a. flame cells b. metanephridia c. nephridia d. protonephridia
Option C. In annelids, the excretory organs are nephridia. Nephridia is an excretory organ which removes nitrogenous waste from the body cavity and expel them through the pores outside the body. The body fluid enters the nephristome which is a funnel shaped opening. Cilia move the fluid through the funnel into nephridium. Nephridium loops and widens into bladder. Bladder drains to outside of the body through nephridiopore. So, the correct answer is 'Nephridia'.
