What are the similarities in the structural organization of polypoid and medusoid forms of cnidarians?

There are two distinct cnidarian body forms: polypoid and medusoid. These are both depicted in Figure below. Both polyp and medusa forms consist of a digestive sac, the coelenteron, surrounded by two layers of tissue, the endoderm and the ectoderm.

How are polyps and Medusas similar?

In the phylum Cnidaria, which includes jellyfish and sea anemones, polyp and medusa are two different stages of the life cycle….

Difference Between Medusa and Polyp
Polyp Medusa
The mouth of polyps faces the water upwards Medusa have their mouths facing the water downwards
Manubrium
Absent in polyps Present in medusae

How are polyp and medusa similar and different?

Sessile structures are called polyps while the swimming forms are called medusa. The key difference between polyp and medusa is that polyp is a fixed, cylindrical structure, representing the asexual stage and medusa is a free swimming, umbrella-like structure, representing the sexual stage.

Do all cnidarians have a polypoid and a medusoid stage?

Cnidarians have separate sexes and many have a lifecycle that involves two distinct morphological forms—medusoid and polypoid—at various stages in their life cycles. In species with both forms, the medusa is the sexual, gamete-producing stage and the polyp is the asexual stage.

What are the two forms of cnidarian How are they similar different?

The two body forms of Cnidarian are the medusa and the polyp. Cnidarians are invertebrates such as jellyfish and corals. All cnidarians are aquatic species and most of them are found living in the ocean. There are more than 10,000 cnidarian species.

How do polyps differ from Medusas?

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 polyp and medusa?

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.

Which characteristic is shared by both cnidarians and flatworms?

Ex4

Question Answer
What is true of echinoderms? Only A and B are true.
Which characteristic is shared by both cnidarians and flatworms? a digestive system with a single opening
Vertebrates and tunicates share a notochord and a dorsal, hollow nerve cord.

Which are the two basic forms of phylum Cnidaria write the difference between these two forms?

Polyp and Medusa are two different body forms, here one is nonmotile in nature and other is in free swimming. These two structures are found in invertebrates phylum Cnidaria i.e Coelenterates. Some of them exist in polyp form while others are in medusa form as these forms are staged in their life.

What do cnidarians have in common?

Cnidarians share several basic characteristics. 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.

What characteristics are common to all cnidarians?

The five main characteristics of cnidarians are:

  • Radial symmetry.
  • Diploblastic animals.
  • Tissue level of organisation.
  • Presence of cnidoblasts with stinging nematocysts on the tentacles.
  • Polymorphism and have two body forms, i.e. polyp and medusa.