What is the process and how are Choanocytes significant?

What is the process and how are Choanocytes significant?

Choanocytes are fundamental to the nutrition of the sponge. Choanocytes keep water flowing through the spongocoel and obtain food, which is necessary for maintenance, growth, and reproduction. In some species, they also produce reproductive cells.

Why is Coelentron called gastrovascular cavity?

Hint: Coelenterates are diploblastic animals. Hence, they lack a coelom. The coelom is a fluid-filled body cavity lined by mesoderm. Instead, they have a gastrovascular cavity.

How does the spongocoel differ from the gastrovascular cavity?

Hint: The gastrovascular system cavity of coelenterates is extensively branched into a system of canals and is commonly known as a “blind gut” or “blind sac”. It serves as a common opening for entry of food and excretion. A spongocoel is the large, central cavity found in sponges.

Are spicules significant to a fundamental process for sponges in what way?

Spicules not only support cells of sponges, they also help larvae to stay buoyant while in the plankton or reach the bottom at settlement, enhance reproduction success, or catch prey.

What is the advantage of a partitioned Gastrovascular cavity?

What is the advantage of a partitioned gastrovascular cavity? The partitioning of the gastrovascular cavity increases its surface area for a greater rate of absorption.

What is coelenteron cavity?

The primary organ of digestion and circulation in the Cnidaria is gastrovascular cavity. It is simple organization around the central cavity. In cnidarians, the gastrovascular cavity is also known as the coelenteron or ‘blind gut’, since, food enters and waste excretes through the same orifice.

Why is Coelenterata also called Cnidaria?

Phylum Coelenterata is also known as Cnidaria due to the presence of cnidoblasts or cnidocytes on the tentacles and body surface. They contain stinging capsules called nematocysts.

What does the spongocoel do?

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).

What is spongocoel 11?

Spongocoel is a large, central cavity of sponges from where water enters. The spongocoel is surrounded by a lining of cells called choanocytes, containing a central flagellum that is surrounded by microvilli.

What are two functions of spicules?

Spicules form the skeleton and provide structural support to sponges. They also provide protection against predators.

What is the difference between medusa and polyp?

Polyps have a tubular shape and are fastened at their base, with the mouth facing the water at the other end of the tube. Medusa has a bell-shaped body with hanging tentacles. Polyp does not have a manubrium. The Hydrozoa class’s Medusa has a manubrium, a tube that hangs from the bell.

What is the advantage of a folded wall in sponges?

What is the advantage of a folded or convoluted body wall in sponges? It increases surface area for absorptionof nutrients and improved gas exchange.

What is the difference between archaeocytes and amoebocytes?

Archaeocytes, often called amoebocytes, are amoeboid cells (i.e., they have the ability to move); their cytoplasm contains large quantities of ribonucleic acid (RNA), and their large nuclei contain small bodies known as nucleoli.

What is enteron?

Definition of enteron : the digestive tract or system —used especially of the embryo.

What is Hypostome in Cnidaria?

Hypostome (cnidarian), the oral tip surrounded by tentacles in hydrozoan cnidarians.

What is the difference between Coelenterata and Cnidaria?

Coelenterata has two subphyla namely cnidaria and Ctenophora. They are aquatic organisms. Cnidaria is a highly diverse group, which is a distinguishing feature called cnidocytes. Ctenophora is a less diverse group, which has comb plates.

What is asconoid Syconoid and Leuconoid?

Syconoids do not usually form highly branched colonies as asconoids do. During their development, syconoid sponges pass through an asconoid stage. Leuconoid sponges lack a spongocoel and instead have flagellated chambers, containing choanocytes, which are led to and out of via canals.