Download Cnidarians Quiz Answers

Cnidarians Quiz Answers
1. True or False: Cnidarians are one of the first types of animals to have
true tissues.
true 2. True or False: Cnidarians, like sponges, have radial symmetry.
false 3. The cnidarian nervous system is known as the ___________.
nerve net 4. What is the gastrovascular cavity?
The gastrovascular cavity is an internal space that is the site of digestion and distribution of nutrients. 5. Describe the body plans of cnidarians.
The body plan of cnidarians is unique because these organisms show radial symmetry. The cnidarians have two basic body forms: the polyp and the medusa. The polyp is a cup-­‐shaped body with the mouth facing upward. The medusa is a bell-­‐
shaped body with the mouth and tentacles facing downward. 6. What do sea anemones and corals have in common?
a) Both have a limestone skeleton.
b) Both have a medusa body form.
c) Both have a polyp body form.
d) none of the above
7. What is a nematocyst?
a) A nematocyst is stinging tissue characteristic of the cnidarians.
b) A nematocyst is group of stinging cells characteristic of the cnidarians.
c) A nematocyst is a feeding tentacle characteristic of the cnidarians.
d) A nematocyst is a cnidarian tail, used for locomotion.
8. Which statement is true concerning corals?
a) Corals are cnidarians with a polyp body plan.
b) Coral skeletons are made up of calcium carbonate.
c) Coral reefs are made of the skeletons of corals.
d) All of the above are true.
9. Which best describes a Portuguese Man o' War?
a) The Portuguese Man o' War is the only cnidarian with a mouth.
b) The Portuguese Man o' War is actually a colony of polyps.
c) The Portuguese Man o' War is actually a group of medusa.
d) The Portuguese Man o' War is made of both polyps and medusa.
10. Cnidarians are among the simplest of the "higher" organisms. Cnidarian organs
include
a) a brain and nervous system.
b) a digestive tract.
c) a primitive heart and blood supply.
d) Cnidarians do not have true organs.