What body cavity does phylum Porifera have?
Answer: Explanation: Poriferans have no true coelom hece called as Acoelomates. They have a small cavity called as spongocoel.
Does Porifera have a coelom?
Primitive phyla without a true coelom include the Porifera and Coelenterata (Cnidaria).
Does Porifera have true body cavity?
Organisms with true coelom are called coelomates while animals in which no true body cavity is present are called acoelomates. Cnidaria, Porifera, Ctenophora and Platyhelminthes are acoelomates. Echinodermata, Vertebrata and Mollusca are higher animals. They have a true coelom.
What type of body structure do Porifera have?
The name porifera means ‘pore bearer’ in Latin (a pore is a tiny hole). A sponge’s body is covered by a skin, one cell thick. This skin has lots of small pores and a few large openings. The small openings are the entrances to a complex system of channels.
How many body layers do Porifera have?
The wall of this cavity is made up by two different cell layers – an outer (animal, sensory or dermal) and the second is the endoderm or inner (vegetative, nutritive or gastral) layer in higher animals” (Haeckel 1872, p.
What type of body cavity do cnidarians have?
gastrovascular cavity
A cnidarian’s body is diploblastic, with two cell layers of the body wall separated by mesoglea, and shows radial symmetry. The body cavity (gastrovascular cavity) is sac-shaped, with one opening acting as both mouth and anus. This opening is surrounded by tentacles bearing thread cells.
What is the nervous system of Porifera?
Porifera are stationary and live off the organism particles and plankton that they filter from the water, and they do not have a nervous system.
Why are sponges classified as animals?
Yes, sea sponges are considered animals not plants. But they grow, reproduce and survive much as plants do. They have no central nervous system, digestive system or circulatory system – and no organs! Sea sponges are one of the world’s simplest multi-cellular living organisms.
Why Porifera are animals?
Sponges do not have chlorophyll and cannot prepare their own food. They capture different organisms for nutrition. Most of the sponges that reproduce sexually produce sperms and eggs. That is why they are considered to be animals and not plants.
What is the name of the body cavity of a sponge?
Unsourced material may be challenged and removed. A spongocoel (/ˈspɒŋɡoʊˌsiːl/), also called paragaster (or paragastric cavity), is the large, central cavity of sponges. Water enters the spongocoel through hundreds of tiny pores (ostia) and exits through the larger opening (osculum).