How do obelia reproduce?

At this stage, the Obelia medusa swim freely and reproduce sexually by releasing either eggs or sperm into the water. Upon fertilization, the resultant zygote develops into a free-swimming larva (plural: larvae) covered in cilia, or tiny hairs. This larva uses the cilia to swim while developing.

1. Where does fertilization occur in Obelia?
2. How do Hydrozoans reproduce?
3. How does Obelia eat?
4. Is Obelia a plant?
5. How do medusae reproduce?
6. What is the characteristics of Obelia?
7. How do Cubozoa reproduce?
8. How do scyphozoa reproduce?
9. What is polyp and medusa?
10. How does Obelia reproduce asexually?
11. What is Hydra explain?
12. What is medusa of Obelia?
13. Is Obelia and Hydra is same?
14. Why is Obelia a colony?
15. Why is Obelia called sea fur?

Where does fertilization occur in Obelia?

Fertilization and Development in Obelia:

Fertilization occurs either in the sea water where the germ cells are set free, or the spermatozoa may be carried by water currents to the female medusae and fertilize the ova in situ. Zygote formed after fertilization, immediately undergoes cleavage.

How do Hydrozoans reproduce?

Most hydrozoans have a benthic, colonial polyp stage, which reproduces asexually by budding. Many have free swimming, sexually reproducing medusae (see Introduction to Ctenophores (and Cnidarian medusae)). Others have attached gonophores, which will produce eggs or sperm.

How does Obelia eat?

Previous observations reported that Obelia medusae might eat phytoplankton, driven to the mouth by movements of both the bell and the tentacles. ... Contrary to other Hydromedusae that are macrophagous, Obelia is a microphagous and filter-feeding medusa, at least at the onset of its medusan life.

Is Obelia a plant?

Obelia is cosmopolitan in distribution, forming a whitish or light-brown plant-like fur in the sea; hence, the common name sea-fur is assigned to it.

How do medusae reproduce?

Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually.

What is the characteristics of Obelia?

Through its life cycle, Obelia take two forms: polyp and medusa. They are diploblastic, with two true tissue layers—an epidermis (ectodermis) and a gastrodermis (endodermis)—with a jelly-like mesoglea filling the area between the two true tissue layers. They carry a nerve net with no brain or ganglia.

How do Cubozoa reproduce?

Cubozoans can reproduce sexually. The male puts his tentacles into the bell of the female and passes over packets of sperm. Fertilization takes place inside the females.

How do scyphozoa reproduce?

The bottom-dwelling forms of some jellyfish reproduce asexually by budding new polyps from the body or foot. Polyps also produce medusae by another asexual budding process that takes place at a certain time of year and is triggered by environmental factors, such as changes in temperature or light level.

What is 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.

How does Obelia reproduce asexually?

The Obelia life cycle begins as immobile polyp colonies that contain digestive hydranth and reproductive gonangium units. The gonangium reproduce asexually, releasing medusa by budding. ... The resulting fertilized eggs develop into larvae, which attach to the ocean floor as new polyps.

What is Hydra explain?

1 : a many-headed serpent or monster in Greek mythology that was slain by Hercules and each head of which when cut off was replaced by two others. 2 not capitalized : a multifarious evil not to be overcome by a single effort.

What is medusa of Obelia?

A fully grown Obelia medusa is a radially symmetrical tiny umbrella, measuring 1 or 2 mm in diameter. Medusa is carnivorous and feeds on planktons.

Is Obelia and Hydra is same?

Hydra is a solitary species and lives attached to substrates, whereas Obelia is a colonial species and lives as polyps in an interconnected branching network. Hydra live in freshwater habitats, whereas Obelia is exclusively marine.

Why is Obelia a colony?

Obelia, genus of invertebrate marine animals of the class Hydrozoa (phylum Cnidaria). ... Obelia medusae release sperm or eggs into the surrounding water, and the resulting ciliated larva eventually metamorphoses to produce a branching colony of polyps.

Why is Obelia called sea fur?

The obelia's body has two kinds of filaments which are vertical hydrocaulus and horizontal hydrorhiza. Obelia's life cycle begins as hydroid polyps. Hydroid polyps are small, immobile animals that have tentacles and stalks. Their structure resembles sea anemones; hence they are also called sea furs.