Phylum Cnidaria test

Cnidarians are dimorphic, meaning they have

2 body shapes

Dipoblastic

2 tissue layers

Hydrozoans

A class of Cnidaria where most of the organisms alternate between polyp and medusa except hydras, which are only polyp. They can reproduce both asexually and sexually.

The class of Cnidarians that typically live only as polyps

Anthozoa

No to kill humans in just a few minutes

Box jelly

Characteristics of cnidarians include all of the following except

Choanocytes

The Cnidarians inner layer of tissue is specialized for

Digestion

The outer layer cell of Cnidarian is the

Epidermis

A jellyfish may be able to regenerate a tentacle if it has been removed

False

Cnidarians can only be found living in colonies

False

Jellyfish have no predators

False

True or false: A group of jellyfish is called a smack.

False

Scyphozoans

Group of cnidarians,all marine, polyp stage is greatly reduced, free swimming medusae is up to 2 m in diameter. (Jellies,sea nettles)

Cnidarians that typically build a skeleton of calcium carbonate belong to the class

Hydrozoans

Which of the following is not sessile as an adult

Lions mane

Can spear a sea anemone's prey

Nematocysts

Sponge Amoebocytes: Cnidarians:

Nerve cell

The movement of cnidarian are coordinated by there

Nerve that

Nematocysts use a ______ to paralyze prey

Neurotoxin

Sensory structures specialized to detect gravity

Statocysts

Planula larvae of the moon jellyfish

Swim freely through the water

Characteristic associated only with Cnidarians

Tentacles with stinging cells

Both sponges and cnidarians exhibit a tissue level of organization

True

Cnidarians have Radial symmetry and are cephalized

True

Coral reefs play a major role in the marine ecosystem

True

The Great Barrier Reef is so large that it can be seen from outer space

True

True or false: Polyps are a body form of cnidarians that are specialized for swimming.

True

True or false: The life cycle of anthozoans includes medusae, planulae, and polyps.

True

True or false: cnidarians Cnidarians are characterized by stinging spicules.

True

Corals exist in a symbiotic relationship with

Zooxanthellae

cephalized

having a head

Coral reefs occur in areas where there are

high levels of light

Scyphozoans spend most of their lives as

medusae

Aurelia aurita

moon jellyfish

Many cnidarians have two distinct life stages called

polyp and medusa

sea anemone are

polyp forms of cnidarians

A hydra has ______ symmetry

radial

Anthazoans include organisms known as

sea anemones and corals