Question

Excretory organs of flatworms are

• A. Malpighian tubules
• B. Protonephridia
• C. Nephron
• D. Nephridia

Answer 1

The Correct Option is B

Answer (b) Protonephridia

Answer 2

Ans. A class of soft-bodied invertebrates known as flatworms. They are also known as platyhelminthes (Platy is Greek for "flat" and Helminth is Greek for "worms"). Flukes, planarians, and tapeworms are all flatworms. Human taeniasis and cysticercosis are caused by the tapeworm genus Taenia. Their bodies resemble tape or ribbons (the Greek word tainai means ribbon).

• Flatworms have a highly developed excretory system. 
• It is made up of a single or two protonephridia that have flame cells. 
• Flame cells are the excretory organs of flatworms and Taenia. 
• Flame cells provide kidney-like functions. 
• They resemble a cup. 
• Excretion and osmoregulation are its primary concerns.
• Flame cells serve as the excretory organs of flatworms (Platyhelminthes), which remove waste products in a manner similar to a kidney.
• Nephridia clean an animal's body of metabolic wastes. 
• They can be discovered in annelids.
• A number of the Malpighian tubule, a tubular excretory organ found in insects and certain other arthropods, open into the gut.
• Nematodes have a distinctive excretory system that, in simpler species, consists of one or two renette cells, which are one-celled glands.
  There are certain characteristics of Phylum Platyhelminthes that are unique in nature. Some of the characteristics are discussed as follows:
• 
  They have a symmetrical body that is bilateral in nature, along with being triboplastic and not possessing any cavity at the body level.
• They do not have a tract in terms of digestion.
• They have the ability to regenerate themselves.
• The covering of their body is soft which can be with or without cilia.
• They are so flat with regard to the structure of the body that they look like a leaf.
• They can also fertilize at the internal level. 
• They do not possess any respiratory system, hence oxygen passes through a diffusion. 
• The food is facilitated for passing through the body by the tissue known as parenchyma.
• The nervous system of Phylum Platyhelminthes consists of the brain along with the nerves in an order of longitudes like a ladder.