Animalscaretips
8th grade Chapter 12 vocabulary
| A | B |
|---|---|
| hermaphrodite | an animal that produces both sperm and eggs |
| tentacles | surrounds the mouth of cnidarian and has stinging cells |
| medusa body form of cnidarian | bell shaped; tentacles hang down; free-swimming |
| polyp body form of cnidarian | sessile; vase shaped; tentacles point up |
- What is a vase shaped cnidarian?
- What is the shape of a cnidarian?
- What is medusa form?
- What is the structure of Cnidaria?
- Is a jellyfish a medusa or polyp?
- What are the two forms of cnidarians?
- Are cnidarians pelagic?
- Do cnidarians have exoskeleton?
- How do cnidarian colonies form?
- What is the body form of a hydra called?
- What is polyp in Cnidaria?
- What is polyp and medusa in Cnidaria?
- How do phylum Cnidaria reproduce?
- How many tissue type is present in cnidaria?
What is a vase shaped cnidarian?
A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are roughly cylindrical in shape and elongated at the axis of the vase-shaped body.
What is the shape of a cnidarian?
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. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.
What is medusa form?
medusa, in zoology, one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria. It is the typical form of the jellyfish. ... The medusa is a free-swimming form; it moves by rhythmic muscular contractions of the bell, providing a slow propulsive action against the water.
What is the structure of Cnidaria?
The body of a cnidarian consists of two cell layers, ectoderm and endoderm. The cellssurround a digestive cavity called the coelenteron (see Figure below). Cnidarians have a simple digestive system. The single opening is surrounded by tentacles, which are used to capture prey.
Is a jellyfish a medusa or polyp?
Jellyfish have a stalked (polyp) phase, when they are attached to coastal reefs, and a jellyfish (medusa) phase, when they float among the plankton. The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae.
What are the two forms of cnidarians?
Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian. Sea nettle (Chrysaora fuscescens). The body of a medusa, commonly called a jellyfish, usually has the shape of a bell or an umbrella, with tentacles hanging downward at the margin.
Are cnidarians pelagic?
Most species undergo a life cycle where a bottom dwelling colonial stage produces the pelagic forms which release either eggs or sperm. ... Cnidarians can be found all the way from the surface to the bottom of the oceans, although most species have a specific range of depth over which they are found.
Do cnidarians have exoskeleton?
A fundamental evolutionary feature of Cnidaria is the skeleton that may be present as an endoskeleton, exoskeleton, or hydrostatic skeleton.
How do cnidarian colonies form?
Cnidarian Colonies
Some types of cnidarians are also known to form colonies. ... One polyp is filled with air to help the colony float, while several feeding polyps hang below with tentacles. The tentacles are full of nematocysts.
What is the body form of a hydra called?
Many members of the Hydrozoa go through a body change from a polyp to an adult form called a medusa, which is usually the life stage where sexual reproduction occurs, but Hydra do not progress beyond the polyp phase.
What is polyp in Cnidaria?
polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria. The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface). ... The lower end of the polyp typically is adapted for attachment to a surface.
What is polyp and medusa in Cnidaria?
Polyp is a sessile life cycle stage of species who belong to phylum cnidaria. Famous examples of polyp are sea anemones and adult corals. ... Medusa is a life cycle stage of the species who belongs to cnidaria phylum. One of the most common examples of species having a medusa life cycle is Hydrozoa or jellyfish.
How do phylum Cnidaria reproduce?
Reproduction of Cnidarians
In general, polyps primarily reproduce asexually by budding, however, some produce gametes (eggs and sperm) and reproduce sexually. Medusae usually reproduce sexually using eggs and sperm. ... The planula then develops into a polyp that can reproduce either sexually or asexually.
How many tissue type is present in cnidaria?
All cnidarians have two tissue layers. The outer layer is called the epidermis, whereas the inner layer is called the gastrodermis and lines the digestive cavity.
