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What is the difference between the NEMATOCYSTS of a hydra and those of a sea anemone? Hydra nematocysts are triggered with pressure while the sea anemone's are triggered chemically.
- Do Hydra have nematocysts?
- What are Hydra nematocysts?
- What do the Hydra use nematocysts for?
- What is the symmetry of a anemone?
- Is Hydra Monoecious or dioecious?
- What are tentacles nematocysts?
- What type of reproduction is Hydra?
- What is the type of reproduction in Hydra?
- What is a Nematocyst and what does it do?
- How does nematocysts perform its function?
- How does Hydra use its tentacles?
- What do nematocysts paralyze prey?
- Do sea anemones have bilateral symmetry?
- What is jellyfish symmetry?
- Which kind of symmetry occurs in sea animal?
Do Hydra have nematocysts?
In Hydra, four types of nematocysts are present: the small desmonemes, with a tightly coiled tubule used for prey attachment; the holotrichous and spineless atrichous isorhizas; and the large stenoteles, with a prominent stylet apparatus at the tubule base employed for piercing solid cuticle structures (8–10).
What are Hydra nematocysts?
Hydras are tiny, simple invertebrates commonly studied by beginning biology students. They belong to the phylum Cnidaria, which includes corals, sea anemones, and jellyfish. Nematocysts are produced by nematoblasts, or cnidoblasts, and are used for capturing and paralyzing prey or for defense. ...
What do the Hydra use nematocysts for?
Hydra littoralis uses stenotele nematocysts for prey-killing. Unused stenoteles are retained when prey-killing ceases. This inactivation results from an accumulation of soluble factors in the surrounding medium, and ends when hydra are placed in fresh culture solution.
What is the symmetry of a anemone?
Sea anemones, named after a terrestrial flower, have a basic radial symmetry with tentacles that surround a central mouth opening. The tentacles are used to catch food and transfer it to their mouth.
Is Hydra Monoecious or dioecious?
Hydras are also dioecious; that is, each individual produces either sperm or eggs. In many temperate-zone species of Hydra, sexual reproduction occurs during the autumn; the fertilized eggs enable the species to survive the winter.
What are tentacles nematocysts?
The tentacles contain a large number of specialized cells called cnidocytes, which contain stinging structures known as nematocysts. The latter vary in shape according to their required purpose.
What type of reproduction is Hydra?
The usual mode of asexual reproduction in Hydra is by bud production, whereby the genetically identical offspring are dependent on their parent until detachment after about 3-4 days growth. Hydras also reproduce sexually, with some spe- cies being hermaphroditic and other gonochoric.
What is the type of reproduction in Hydra?
When food is plentiful, many Hydra reproduce asexually by budding. The buds form from the body wall, grow into miniature adults and break away when mature. When a hydra is well fed, a new bud can form every two days.
What is a Nematocyst and what does it do?
Abstract. Nematocysts or cnidocysts represent the common feature of all cnidarians. They are large organelles produced from the Golgi apparatus as a secretory product within a specialized cell, the nematocyte or cnidocyte. Nematocysts are predominantly used for prey capture and defense, but also for locomotion.
How does nematocysts perform its function?
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.
How does Hydra use its tentacles?
Hydra tentacles contain barbed, poison containing cnidocytes that they use to stun animals like the water flea, Daphnia, before eating them alive, and to protect themselves from attack by other animals.
What do nematocysts paralyze prey?
Cnidarians use nematocysts to catch their food. When touched, the nematocysts release a thread of poison that can be used to paralyze prey. Cnidarians are among the simplest of the so-called "higher" organisms, but are also among the most beautiful.
Do sea anemones have bilateral symmetry?
Although animals of the phylum Cnidaria are not within the Bilateria, some representatives, such as the sea anemone Nematostella vectensis, exhibit bilateral symmetry. ... These data suggest that bilateral symmetry arose before the evolutionary split of Cnidaria and Bilateria.
What is jellyfish symmetry?
Jellyfish and many other marine animals such as sea urchins, sea stars, and sea anemones have what is known as radial symmetry.
Which kind of symmetry occurs in sea animal?
Radial symmetry: Some organisms, like sea anemones (phylum Cnidaria), have radial symmetry.
