Question

How do poriferan animals differ from coelenterate animals?
A. They have gastrovascular cavity
B. They have nematocyst
C. They have incomplete digestive system
D. Both A and B

Answer 1

Hint: In the kingdom of Animalia, both Porifera and Coeleterata are two phylums. Phylum animals: Porifera is commonly referred to as sponges. Animals belonging to the phylum: Cnidaria is the name of Coelenterata.

Complete Answer:

Sl.No	Porifera animal	Coelenterate animal
1.	Poriferans are asymmetric and non-motile.	Radially symmetrical and motile.
2.	These entities are porous, they have gaps in their whole bodies.	These entities have a coelenteron, a cavity of the body that only has one opening.
3.	Possess a cellular organisational level.	Possess a tissue organisational level.
4.	The body consists of a single cell layer.	The body consists of two cell layers.
5.	Body design exhibits minimal division and tissue differentiation.	Body design exhibits differentiation in body design.
6.	The cavity mechanism helps to carry water and food into the water circulation through the body.	Its characteristic function is the cavity in the body.
7.	They do not have a gastrovascular system because they have an organisational cell level where individual cells do not form tissues.	While the organisational tissue level is discovered in coelenterates so that they can form a gastrovascular cavity.
8.	Nematocyst is absent.	Nematocyst is a specialised cell in the coelenterate tentacles that helps in defence.
9.	Heat, food and oxygen flow across the body through the traditional canal system.	The coelenteron allows the circulation of water, food and oxygen.
10.	Asexual reproduction of sponges occurs by budding or forming gemmules after fragmentation.	By budding in the polyps, asexual reproduction takes place.
11.	Each layer 's cells are not bound together,	Coelenterata are made up of the basement membrane and inter-cell connections.

The correct answer is option (D) Both A and B.

Note: Porifera Phylum: They are typically aquatic animals and often asymmetrical. There is a water transport or canal system for sponges. Through minute pores (ostia) in the body wall, water enters a central cavity, spongocoel, from where it goes out through the osculum.
Phylum Coelenterates: For anchorage, defence and for the capture of prey, cnidoblasts are used. Coelenterata (Cnidaria) are aquatic, often sessile marine or radially symmetrical free-swimming.