Phylum Cnidaria & Ctenophora Lesson

Multiple Choice

What is the jellylike material that separates the endoderm and ectoderm?

• mesoderm
• cytoplasm
• mesoglea
• cytosol

Multiple Choice

Which of the following is a correct description of the Cnidarian digestive tract?

• A complete digestive tract consisting of two openings.

• A complete digestive tract consisting of one opening.

• An incomplete digestive tract consisting of two openings.

• An incomplete digestive tract consisting of one opening.

Multiple Choice

The central nervous system of cnidarians includes a brain.

• true
• false

Multiple Choice

Which of the following is a correct description of the polyp body form?

• It is sessile and the tentacles and mouth point downward.

• It is sessile and the mouth and tentacles point upward.

• It is mobile and the tentacles and mouth point downward.

• It is mobile and the tentacles and mouth point upward.

Multiple Choice

What are the organelles inside the cnidaria stinging cells that inject paralyzing toxins into their prey?

• pinacocytes

• lysomatocyts

• choanocytes

• nematocysts

Multiple Choice

What do jellyfish eat?

• Fish, shrimp, crabs and tiny plants because they'll eat anything they can

• Fish, shrimp, and crabs because they're small enough to catch

• Tiny plants, algae, and kelp because they're herbivores

• Zooplankton because it is small enough to swallow without chewing

Multiple Choice

Which body form do members of Class Scyphozoa have?

• medusa
• polyp
• polyp and medusa

Multiple Choice

The animals with poison more potent than that of a cobra are the __________.

• box jellies

• true jellies

• corals

• Portuguese Man-o-wars

Multiple Choice

In Class Hydrozoa, you would find the hydra, obelia, and the

• Aurelia
• sea anemone
• Portuguese man-of-war
• coral

Multiple Choice

The "flower animals" include sea anemones and __________.

• box jellies

• true jellies

• corals

• Portuguese Man-o-wars

Multiple Choice

What animals are NOT included in Phylum Cnidaria?

• jellyfish

• anemones

• squids

• corals

Multiple Choice

Which of the following BEST describes jellyfish anatomy?

• They have no hearts, brains, or eyes. There is a set of nerves above their tentacles that give them basic senses.

• They are one of the first animals with cephalization, meaning they have a cluster of nerves above their tentacles that act as a brain

• They have no hearts or brains, only tentacles and a pair of eyes that see in the infrared spectrum of light

• They have complex brains, nerves, and digestive systems, just like their close relatives squids

Multiple Choice

What are jellyfish MOSTLY made of?

• Mostly water, about 60%

• Mostly water, about 95%

• Mostly jelly-like substance, about 95%

• Mostly jelly-like substance, about 60%

Multiple Choice

The cnidarian nervous system is composed of:

• a simple brain
• nerve clusters
• a nerve net
• nothing

Multiple Choice

Organisms with two different body forms exhibit:

• dimorphism
• bimorphism
• dioecious
• bioecious

Multiple Choice

Cnidarians can reproduce...

• sexually only

• asexually only

• both sexually and asexually

• neither sexually or asexually

Multiple Choice

How do jellyfish catch prey?

• Their tentacles paralyze their prey before dragging the prey into the mouth at the center of its body

• They use their tentacles to constrict and suffocate their prey before dragging the prey into the mouth at the center of its body

• Their tentacles paralyze their prey and break it down into mush that they drink with the sea water because they cannot chew

• They use their sharp claws to attack their prey before dragging the prey into the mouth at the center of its body

Multiple Choice

Phylum Cnidaria is known as 

• "stinging cells"
• "Tentacles"
• "Cleaners"
• "Sponges"

Match

Match the following organism with their class name.

Hydrazoa

Anthozoa

Scyphozoa

Cubozoa

• Hydrazoa

• Anthozoa

• Scyphozoa

• Cubozoa

Multiple Choice

True or False: Some comb jellies have been known to be invasive.

• True

• False

Multiple Choice

Phylum Ctenophora include:

• All jellies

• Box jellies

• Comb jellies

• Simple worms

Multiple Choice

Ctenophores differ from jellies by:

• having stinging cells.

• having the ability to grow larger than most fish.

• being colorless.

• using cilia for movement.

Multiple Choice

What is different about the digestive system in comb jellies versus regular jellies?

• There is no difference

• Jellyfish have a complete gut while comb jellies do not

• Comb jellies have two openings while jellyfish have one

• The gut of jellyfish extends their whole body but comb jellies only have a gastrovascular cavity

Multiple Choice

What is a characteristic feature of Ctenaphora?

• Bilateral symmetry

• Tube feet

• Nematocysts

• Chiton exoskeleton

Multiple Choice

The group that displays luminescence in the dark is Phylum __________.

• Cnidaria

• Ctenophora

• Nemertea

• Platyhelminthes

Multiple Choice

What is the name of the sticky cells that cover the comb jellies?

• nematocysts
• cnidocytes
• colloblasts