Question

what do you mean by false and true body cavity?

Answer 1

false means no body cavity and true body cavity means a whole well differentiated cavity in which the internal organs are placed.

Answer 2

Answer:

A ‘body cavity’ is the fluid-filled enclosed space ‘created in an organism’ which holds the internal organs.  

A true body cavity or coelom;

• Originates from the mesodermal germ layer of the embryo of the triploblastic organisms and is present in the mesoderm.
• It is lined with peritoneum or the coelomic fluid.
• Nutrients are circulated through the blood inside the coelom
• Organisms, both vertebrates and invertebrates, present with true body cavity or coelom are called as coelomates or eucoelomates like the “arthropods, molluscans, chordates” etc

A false body cavity or pseudocoelom;

• Originates from the blastocoel of an embryo of the triploblastic organisms and is located between the endoderm and mesoderm.
• It is partially lined with coelomic or peritoneal fluid
• Transport of nutrients is by diffusion and osmosis and not circulation
• Invertebrate organisms, present with false body cavity or pseudocoelom are called as pseudocoelomates like from “phylum Nematoda, Acanthocephala, Entoprocta” etc.