Download Assignment 3: OBJ 4 and 5

Assignment 3 OBJ 4 and 5 Unit 2
Use the textbook and notes to answer the following questions.
Question 1 1 pts
Cnidarians and Ctenophores have this type of body symmetry
spiral
radial
asymmetrical
bilaterial
Question 2 1 pts
A capsule that contains a coiled, threadlike tube. The tube may be sticky or barbed, and it may contain toxic substances.
They are located on stinging cells on the tentacles.
gastrovascular cavity
nerve net
nematocyst
polymorphism
Question 3 1 pts
The sessile form of a cnidarian. Its mouth is surrounded by tentacles. Examples include sea anemones and corals.
polyp
larvae
medusa
budding
Question 4 1 pts
the free swimming form of a cnidarian. It possesses an umbrella-shaped, floating body, called a bell, with the mouth on
the underside.
larvae
polyp
budding
medusa
Question 5 1 pts
An area inside the cnidarian which has cells adapted for digestion and release enzymes over captured prey. Any
undigested materials are ejected back out through the mouth.
gastrovascular cavity
water vascular system
Nerve Net
polymorphism
Question 6 1 pts
A simple nervous system (without a brain), in which impulses to and from all parts of the body are sent. The impulses
cause contractions of muscle-like cells in the two cell layers.
nerve net
water vascular system
gastrovascular cavity
nematocyst
Question 7 1 pts
The release of a part of an organism which can develop into another organism.
external budding
sexual reproduction
germ layers
polymorphism
Question 8 1 pts
The presence in a species of more than one structural type of individual. (polyp and medusa).
metamorphosis
polymorphism
cnidocytes
nematocysts
Question 9 1 pts
There are no terrestrial cnidarians (cnidarians which live on land).
True
False
Question 10 1 pts
Cnidarians sometimes live symbiotically with other animals often as commensals on the shell or other surface of their
host.
True
False
Question 11 1 pts
Some cnidarians live in fresh water.
True
False
Question 12 1 pts
Cnidarians do not have an excretory or respiratory system.
True
False
Question 13 1 pts
Polyps are typically carnivorous, catching prey with their tentacles and passing them through the mouth into the
gastrovascular cavity for digestion.
True
False
Question 14 1 pts
which is the correct sequence of the life cycle of a jellyfish:
1) A polyp grows and buds repeatedly
2) External fertilization takes place in the sea
3) A zygote develops into a blastula, which develops into a larva
4) Male and Female medusae release sperm and eggs, respectively.
5) A cilia-covered larva settles onto a surface.
6) A tiny medusa breaks free from its sessile parents and drifts away.
4,2,5,3,1,6
4,2,3,5,1,6
4,2,6,5,1,3
4,2,3,5,1,6
Question 15 1 pts
What is the mode of reproduction of medusae?
asexual by budding
sexual by budding
sexual by releasing sperm and eggs
asexual by gemmules
Question 16 1 pts
What is the mode of reproduction of polyps?
asexual by gemmules
sexual by budding
asexual by budding
sexual by releasing sperm and eggs
Question 17 1 pts
Where does fertilization of egg cells by sperm cells occur?
around the polyp in the open ocean
below the medusae in the open ocean
inside of the polyp
inside of the medusae
Question 18 1 pts
Polyps reproduce by asexually by budding. The small buds grow as extensions of the polyp's body wall. As the buds
develop, they form the mouth and tenacles of tiny polyps, then break away and settle to create a new polyp
True
False
Question 19 1 pts
Polyps reproduce sexually by producing medusae. The medusae then break away from the parent polyp and form into
jellyfish.
True
False
Question 20 1 pts
The fertilized egg becomes a zygote, which in turn, grows and develops into a blastula. The blastula becomes a freeswimming larva that must find an area for attachment and the beginning of the asexual phase of the jellyfish life cycle.
True
False
Question 21 1 pts
Both the polyp and medusa have a mouth surrounded by tentacles.
True
False
Question 22 1 pts
The body form of the medusa is tube-shaped and the body form of the polyp is bell shaped.
True
False
Question 23 1 pts
The mouth of the polyp can point upward and the mouth of the medusa is pointed downward.
True
False
Question 24 1 pts
The polyp floats through the water but the medusa is sessile.
True
False