What is the difference between cnidarians and sponges?
Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.
How are sponges and cnidarians alike?
Porifera and Cnidaria are organisms which share similar characteristics with one another. -They are both multicellular, they consist of many cells working together. They are both eukaryotic, they have DNA in the form of chromosomes contained within a distinct nucleus.
Which characteristic do sponges and cnidarians share?
The characteristic shared by all of these species is that their gonads are derived from epidermal tissue, whereas in all other cnidarians, they are derived from gastrodermal tissue (Figure 15.2.
What is the main difference between sponges Porifera and Cnidaria?
Cnidaria and porifera are two different phyla. Cnidarians have Cnidocytes but not the poriferans. Cnidarians have well-organized organ systems but not the poriferans; on the other hand, poriferans have an efficient tunnel system made up of pores but not the cnidarians.
What is the body plan of cnidarians?
Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). All cnidarians have two membrane layers, with a jelly-like mesoglea between them. Some cnidarians are dimorphic, that is, they exhibit both body plans during their life cycle.
What is the body plan of a sponge?
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.
Which body plan of cnidarians is more similar to that of a sponge?
How is the body plan of a cnidarian similar to that of a sponge? They are both soft bodied animals with a hollow central cavity.
What body cavity does Cnidaria have?
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. Cnidarians exist both as free-swimming medusae (e.g. jellyfish) and as sedentary polyps.
What are the 2 body forms of cnidarians?
There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa.
How do the two body plans of cnidarians differ?
How do the two body plans of cnidarians differ? Poly: sessile, has a cylindrical body with tentacles, first stage of a cnidarian. Medusa: has a motile, bell shaped body with a mouth on the bottom.
What are the three body plans?
What are the 3 planes of motion in the body?
- Sagittal Plane: Cuts the body into left and right halves. Forward and backward movements.
- Coronal (or Frontal Plane): Cuts the body into front and back halves. Side-to-side movements.
- Transverse Plane: Cuts the body into top and bottom halves. Twisting movements.
What is the body cavity of sponges?
spongocoel
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 type of body cavity do sponges have?
Simple sponges of the asconoid type have a small central cavity or spongocoel, where the choanocytes are located. The more complex syconoid sponges (like Grantia) have folded canals of feeding cells off the spongocoel.
Is a sponge a cnidarian?
Sponges belong to Phylum Porifera. Cnidarians belong to Phylum Cnidaria.
What are body cavities?
A body cavity is a fluid-filled space inside the body that holds and protects internal organs. Human body cavities are separated by membranes and other structures. The two largest human body cavities are the ventral cavity and dorsal cavity. These two body cavities are subdivided into smaller body cavities.
Do Cnidaria have a body 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.