All cnidarians possess long extensions of the body called tentacles?

1. Do all cnidarians have tentacles?
2. Are cnidarians tentacles retractable?
3. What body type does this cnidarian posses?
4. Do cnidarians have muscles?
5. Do all cnidarians have radial symmetry?
6. What constitutes a tentacle?
7. What are tentacles made of?
8. Where are tentacles present?
9. Are cnidarians Monoecious or dioecious?
10. Do cnidarians have tissues?
11. How many body parts do cnidarians have?
12. What are the functions of tentacles?
13. What is the larva of a cnidarian called?
14. Which of the following groups consists exclusively of cnidarians?

Do all cnidarians have tentacles?

All Cnidarians have tentacles with stinging cells in their tips which are used to capture and subdue prey. In fact, the phylum name "Cnidarian" literally means "stinging creature." The stinging cells are called cnidocytes and contain a structure called a nematocyst.

Are cnidarians tentacles retractable?

Members of the phyla Cnidaria and Bryozoa both have a circle of tentacles, which they use for feeding. ... Cnidarian tentacles are retractable, but Bryozoan tentacles are nonretractable. Cnidarian tentacles have stinging cells, but Bryozoan tentacles are covered with cilia.

What body type does this cnidarian posses?

Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian. Sea nettle (Chrysaora fuscescens). The body of a medusa, commonly called a jellyfish, usually has the shape of a bell or an umbrella, with tentacles hanging downward at the margin.

Do cnidarians have muscles?

Muscles in cnidarians are extensions of the bases of ectodermal and endodermal cells. Individual muscle cells are relatively long and may occur in dense tracts in jellyfish or sea anemones. Most cnidarian muscles, however, are thin sheets at the base of ectodermal and endodermal layers.

Do all cnidarians have radial symmetry?

All cnidarians have a central point or axis, and if you divide a cnidarian through this central axis, you'll end up with equal parts on either side. Even though cnidarians vary a great deal, they all have radial symmetry as a common characteristic.

What constitutes a tentacle?

Definition of tentacle

1 : any of various elongate flexible usually tactile or prehensile processes borne by invertebrate animals chiefly on the head or about the mouth.

What are tentacles made of?

Cephalopod tentacles and arms lack bones; instead, they are built from an intricate tapestry of coiling muscle fibers. A cuttlefish shoots a tentacle at its prey by contracting fibers along the tentacle's entire length.

Where are tentacles present?

Tentacles are any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals used for feeling or grasping or locomotion.

Are cnidarians Monoecious or dioecious?

Depending on the species, cnidarians can be monoecious (also called hermaphroditic), with individuals capable of producing both eggs and sperm, or they can be dioecious, with individuals of separate sexes for gamete production.

Do cnidarians have tissues?

All cnidarians have two tissue layers. The outer layer is called the epidermis, whereas the inner layer is called the gastrodermis and lines the digestive cavity. Between these two layers is a non-living, jelly-like mesoglea.

How many body parts do cnidarians have?

Cnidarian morphology: Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). All cnidarians have two membrane layers, with a jelly-like mesoglea between them. Some cnidarians are polymorphic, having two body plans during their life cycle.

What are the functions of tentacles?

Anatomically, the tentacles of animals work mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats.

What is the larva of a cnidarian called?

planula, plural planulae, free-swimming or crawling larval type common in many species of the phylum Cnidaria (e.g., jellyfish, corals, and sea anemones). The planula body is more or less cylindrical or egg-shaped and bears numerous cilia (tiny hairlike projections), which are used for locomotion.

Which of the following groups consists exclusively of cnidarians?

Among the following given options only Hydra, Obelia, Adamsia, Physalia consists exclusively of Cnidarians as these organisms can be characterized by the presence of tentacles on their bodies. Members of this phylum are diploblastic.