21.The excretory structures of flatworms/Taenia are [1991] A. Flame cells B. Protonephridia C. Malpighian tubules D. Green glands
Option A. Excretory organs in Taenia are flame cells that are scattered everywhere in the mesenchyme. A flame cell is of abnormal form with granular cytoplasm and a nucleus. Flame cells feature like a kidney and get rid of waste materials.
