Question

Which of the following organisms have holes in the body?
(a)Coelenterata
(b)Porifera
(c)Annelida
(d)Arthropoda

Answer 1

Hint: Organisms with holes in their bodies are known to be the oldest living species. They are best known as sponges and sponge models that include Sycon (Scypha), Spongilla (freshwater sponge), and Euspongia (Bath sponge).

Complete Answer:
Creatures with holes in the body belong to Portia. The name Porifera itself refers to things that have holes or holes in their body. They have minute pores called Ostia in their body where water enters and leads to a central body cavity known as the spongocoel and outside the body through the osculum. This system is known as the drainage system and the drainage system. The system is used to collect food, exchange gases, and dispose of waste as sponges are non-sexual objects and cannot travel in search of food.

Additional Information:
Coelenterata: These organisms are known as coelenterates due to the presence of space in the stomach lining. They are also known as Cnidarians because of the presence of cnidoblasts or cnidocytes in the palms of their bodies that contain lethal drugs called nematocysts. Examples include Physalia (Portuguese warrior), Hydra, Adamsia, Obelia, Aurelia.
Annelida: These creatures are known as annelids as their body is divided into sections or metameres i.e. small rings and this condition is known as metamerism. Examples include Nereis (aquel annelid), Pheretima (Earthworm), Hirudinaria (lechucking leech).
Arthropoda: This phylum is the largest phylum in the animal kingdom of more than two-thirds of all named species of Arthropoda. Featured features of arthropods are the presence of joint legs, the chitinous exoskeleton, and the separation of the body from the head, chest, and abdomen. Examples include Apis (Honeybee), Anopheles (Mosquito), Limulus (King crab).

So, the correct option is 'Porifera'.

Note:
-The broadcasters have cells known as choanocytes of collagen cells that include spongocoel (body cavity) and drainage system.
-The body of poriferans is supported by spicule bones or spongin fibers.
-The regeneration of sponges occurs through excessive cracking and the formation of sexual gametes.