What are the 2 types of body structures of cnidarians?

Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian.

1. What are the two types of body structures of cnidarians?
2. What are the 2 layers that make up the body wall of cnidarians?
3. What are the body parts of cnidarians?
4. What are the two body forms of cnidarians and how do they differ?
5. How do the two body plans of cnidarians differ?
6. What 3 structures do all cnidarians possess?
7. What structures in cnidarians contain toxins?
8. What are the 3 layers of a cnidarians body?
9. What two digestive system structures appeared first in the cnidarians?
10. What is the common adaptation of cnidarians?
11. What are the two main morphological patterns of cnidarians concerning locomotion How are these forms different from each other?
12. What is the function tentacles in cnidarians?
13. What are the two stages in the cnidarian life cycle?
14. Which of the following are characteristics of cnidarians?
15. How is the body plan organized in cnidarians body symmetry?
16. What is the difference between porifera and cnidaria?

What are the two types of body structures 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. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.

What are the 2 layers that make up the body wall of cnidarians?

Tissues and muscles. Cnidarians consist of two cell layers: an outer ectoderm and an inner endoderm (the gastrodermis) that lines the coelenteron.

What are the body parts of cnidarians?

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.

What are the two body forms of cnidarians and how do they differ?

Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). ... In these species, the polyp serves as the asexual phase, while the medusa serves as the sexual stage and produces gametes. However, both body forms are diploid. An example of cnidarian dimorphism can be seen in the colonial hydroid Obelia.

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 3 structures do all cnidarians possess?

In addition to a primitive digestive cavity, cnidarians have a decentralized nervous system, muscle tissue, reproductive tissues, and a hydrostatic skeleton.

What structures in cnidarians contain toxins?

Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, and serve to immobilize prey with toxins contained within the cells. Nematocysts contain coiled threads that may bear barbs.

What are the 3 layers of a cnidarians body?

The body wall of a cnidarian consists of three layers, an outer layer known as the epidermis, a middle layer called the mesoglea, and an inner layer referred to as the gastrodermis. The epidermis contains a collection of different types of cells.

What two digestive system structures appeared first in the cnidarians?

The two digestive system structures that appeared first in cnidarians was stomachs and mouth. A cnidarian has two sets of muscles that allows it to bend in diffeeent direction. The nerve cells controls the cnidarians movement.

What is the common adaptation of cnidarians?

What is the common adaptation , which unites them into the common group of Cnidaria? Their ability to sting their prey. What language was the word Cnidaria derived from and what does the word mean? The language the word Cnidaria derived from is Greek and it means stinging nettle.

What are the two main morphological patterns of cnidarians concerning locomotion How are these forms different from each other?

Concerning locomotion, how are these forms different from each other? Morphologically, cnidarians are classified as polyps or medusae. Polyps are cylindrical and medusae are circular convex, like an umbrella. Both shapes have tentacles.

What is the function tentacles in cnidarians?

Tentacles have cnidoblasts (stinging cells) at the tip, which capture and immobilise the prey. Tentacles move the captured food to the mouth. Tentacles also protect cnidarians from predators.

What are the two stages in the cnidarian life cycle?

Cnidarians all have a life cycle of two forms. One is a free-swimming jellyfish medusa stage and the second is an attached polyp stage. Cnidarians have a radially symmetrical body shape with a mouth surrounded by rings of tentacles.

Which of the following are characteristics of cnidarians?

All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea. Most Cnidarians have radial symmetry.

How is the body plan organized in cnidarians body symmetry?

Cnidarians have a slightly more organized body plan, and have tissues, but no organs. Most cnidarians have two tissue layers. The outer layer, the ectoderm, has cells that aid in capturing food and cells that secrete mucus. ... The body plans cnidarians generally have radial symmetry (Fig.

What is the difference between porifera and cnidaria?

Porifera are aquatic organisms known as sponges, while cnidarians are for example jellyfishes, corrals, etc. Poriferans are the most simple multicellular animal organisms. They are always sessile while cnidarians may be sessile (the corrals) or free living (jellyfishes).