What is difference between medusa and polyp stages?

Polyp is a sessile life cycle stage of the Cnidaria phylum. Medusa is a mobile life cycle stage of the Cnidaria phylum, contracting with it muscular bell. Polyp have a tubular shape and are fixed at their base, with the mouth present at the other end of the tube facing the water.

What differences do you see in the polyp and medusa stages of obelia to that of Aurelia?

Their life cycle alters between polyp and medusa stages. Here, their medusa phase is free-swimming while the polyp phase is sessile. Furthermore, the medusa phase is the sexual phase while the polyp phase is the asexual phase. Also, both life stages have radial symmetry.

Is polyp a medusa?

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 an example of a medusa and a polyp?

An example of the polyp form is found in the genus Hydra, whereas the most typical form of medusa is found in the group called the “sea jellies” (jellyfish). Polyp forms are sessile as adults, with a single opening (the mouth/anus) to the digestive cavity facing up with tentacles surrounding it.

What is the function of polyp and medusa?

Is Hydra a polyp or medusa?

Hydra exists in both forms: Polyp and Medusa. These forms are dependent upon nutritional content of the living environment. Medusa is the adult and sexual form whereas Polyp is juvenile and asexual form. Under harsh living conditions and starvation, hydra reproduces sexually.

Is sea anemone a polyp or medusa give reasons?

Sea anemones are the marine, predatory animals of the order Actiniaria. Unlike jellyfish, sea anemones do not have a medusa stage in their life cycle. A typical sea anemone is a single polyp attached to a hard surface by its base, but some species live in soft sediment and a few float near the surface of the water.

What are examples of polyp?

Polyps generally reproduce asexually (by budding) whereas medusae, by sexual reproduction. Some Cnidarians take a polyp body form (e.g. sea anemones and corals); others, medusa (e.g. scyphozoans). But there are also Cnidarians that exhibit both polyp and medusa stages in their life cycle (e.g. most hydrozoans).

What are the similarities between polyp and medusa?

Both polyp and medusa have a body wall, which surrounds an internal space called gastrovascular cavity. Both are aquatic organisms. Both have the mouth and are surrounded by tentacles.

Why are hydras polyps?

Some species of hydra can produce both ovary and testis. Fertilized eggs develop a shell and remain dormant in harsh living condition until favorable condition for growth is restored. Now these eggs develop and thrive as polyp and reproduce asexually as polyp in favorable climate.

What is the difference between a medusa and polyp?

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.

What’s the difference between Obelia and medusa jellyfish?

The polyp phase of Obelia produces branched stalks while the medusa phase of jellyfish produces unbranched stalks. Obelia is a form of hydrozoans that have branched stalks. Also, the dominant phase of the life cycle of Obelia is the polyp.

Is the medusa stage the same as the polyp stage?

Polyp and medusa are two different life cycle stages of many species of the phylum Cnidaria. The phylum Cnidaria includes species existing only in the polyp stage (Anthozoa), species existing in the medusa stage, and species with both life cycle stages (Hydrozoa). Corals, sea anemones, jellyfish, and hydroids are cnidarians.

What are the two forms of the Obelia?

Obelia throughout its life cycle takes two forms: polyp and medusa. The first form is diploblastic, two true tissue layers – an epidermis (ectodermis). In contrast, the second form is gastrodermis (endodermis), with a mesoglia which is jelly-like filling the area between the two tissue layers.

Which is the dominant phase of the Obelia life cycle?

Obelia is a form of hydrozoans that have branched stalks. Also, the dominant phase of the life cycle of Obelia is the polyp. However, the polyp form of Obelia is very small.