What do flatworms and cnidarians have in common?
Like the cnidarians, flatworms have a digestive system with only a single opening into the digestive cavity, but in independently living marine flatworms the cavity branches into all parts of the body (Fig. Undigested food passes back out through the mouth, as in the cnidarians.
Are porifera free living or parasitic?
From the Latin words porus, mean- ing “pore,” and fera, meaning “bearer.” Phylum Porifera includes animals with pores that allow water to flow through their bodies. No matter where sponges live, they are mainly sessile organisms. Because most adult sponges are sessile, they can’t travel in search of food.
In what way are cnidarians more complex than sponges What characteristics did they add?
Cnidarians are a little more complex than sponges. They have radial symmetry and tissues. There are more than 10,000 cnidarian species. Cnidarians show a lot of variability.
What provides the hard support system of the sponge?
interior of sponges are collar cells. Each collar cell has a flagellum that whips back and forth, drawing water into the sponge. produced by cells derived from amoebocytes, and form the hard support systems of sponges. The small, needlelike structures located between the cell layers of a sponge are called spicules.
What are the 3 sponge body forms?
There are three different body plans found among sponges: asconoid, synconoid, and leuconoid. Sponge feeding is critically dependent on several specialized cells within the organism including the following: choanocytes, amoebocytes, and porocytes.
What sponge body type is most efficient?
Leuconoid sponges
What will happen when sponges are pushed together?
Answer: Water spills out if the sponges are wet, and nothing happens if they are dry. Explanation: Hope this helps!!!
What creates water current in sponges?
The beating of the choanocytes’ flagella creates the sponge’s water current. * Porocytes are tubular cells that make up the pores into the sponge body through the mesohyl.
What do Pinacocytes do in sponges?
Pinacocytes are part of the epithelium in sponges. They play a role in movement (contracting and stretching), cell adhesion, signaling, phagocytosis, and polarity. Pinacocytes are filled with mesohyl which is a gel like substance that helps maintain the shape and structure of the sponge.
What are the 4 types of cells in a sponge?
Although sponges do not have organized tissue, they depend on specialized cells, such as choanocytes, porocytes, amoebocytes, and pinacocytes, for specialized functions within their bodies. The mesohyl acts as a type of endoskeleton, helping to maintain the tubular shape of sponges.
Is the base of the sponge open or closed?
Open-cell sponge rubber has distinct cells that are interconnected to neighboring cells. There are no discreet and separated individual cell walls. Closed-cell sponge rubber consists of individual cells, each with its own elastomeric wall that separates it from the other.
What is an Amoebocyte in a sponge?
sponges. In sponge: Choanocytes and archaeocytes. 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.
Where are Amebocytes located in a sponge?
mesohyl
How is being hermaphroditic an advantage to sponges?
How is being hermaphroditic an advantage to sponges? They produce both male and female gametes and are both sexual and asexual. Describe asexual reproduction in sponges by budding. When sponges produce both male and female gametes are formed when amebocytes divide by mitosis.
What is the purpose of Amoebocyte?
Amoebocytes have a variety of functions: delivering nutrients from choanocytes to other cells within the sponge, giving rise to eggs for sexual reproduction (which remain in the mesohyl), delivering phagocytized sperm from choanocytes to eggs, and differentiating into more-specific cell types.
What is Gemmule give an example?
Gemmules are internal buds found in sponges and are involved in asexual reproduction. In botany, gemmules refer to the asexual reproductive structures in some plants, such as the buds of mosses and the spores of hydra. …
What is Gemmule example?
Gemmules are internal buds found in sponges and are involved in asexual reproduction. It is an asexually reproduced mass of cells that is capable of developing into a new organism, that is, an adult sponge. Example is Spongilla lacustris.