The animal phylum most like the protists that gave rise to the animal kingdom is _____.
Porifera
Sponges are most accurately described as
filter feeders
Which of the following is a characteristic of cnidarians?
gastrovascular cavity
How many of the following are characteristics of at least some
members of the phylum Cnidaria?
1. a gastrovascular
cavity
2. a polyp stage
3. a medusa stage
4.
cnidocytes
5. a pseudocoelom
1, 2, 3, 4
Which of the following is true of members of the phylum Cnidaria?
They may use a gastrovascular cavity as a hydrostatic skeleton.
Which of the following is a diploblastic phylum of aquatic predators?
Cnidaria
Use the following information to answer the question(s) below.
An elementary school science teacher decided to liven up the
classroom with a saltwater aquarium. Knowing that saltwater aquaria
can be quite a hassle, the teacher proceeded stepwise. First, the
teacher conditioned the water. Next, the teacher decided to stock the
tank with various marine invertebrates, including a polychaete, a
siliceous sponge, several bivalves, a shrimp, several sea anemones of
different types, a colonial hydra, a few coral species, an ectoproct,
a sea star, and several herbivorous gastropod varieties. Lastly, she
added some vertebrates–a parrotfish and a clownfish. She arranged for
daily feedings of copepods and feeder fish.
One day, Tommy, a student in an undersupervised class of forty
fifth graders, got the urge to pet Nemo (the clownfish), who was
swimming among the waving petals of a pretty underwater
"flower" that had a big hole in the midst of the petals.
Tommy giggled upon finding that these petals felt sticky. A few hours
later, Tommy was in the nurse's office with nausea and cramps.
Microscopic examination of his fingers would probably have revealed
the presence of _____.
nematocysts
Use the following information to answer the question(s) below.
An elementary school science teacher decided to liven up the
classroom with a saltwater aquarium. Knowing that saltwater aquaria
can be quite a hassle, the teacher proceeded stepwise. First, the
teacher conditioned the water. Next, the teacher decided to stock the
tank with various marine invertebrates, including a polychaete, a
siliceous sponge, several bivalves, a shrimp, several sea anemones of
different types, a colonial hydra, a few coral species, an ectoproct,
a sea star, and several herbivorous gastropod varieties. Lastly, she
added some vertebrates–a parrotfish and a clownfish. She arranged for
daily feedings of copepods and feeder fish.
The teacher and class were especially saddened when the colonial
hydrozoan died. They had watched it carefully, and the unfortunate
creature never even got to produce offspring by budding. Yet, everyone
was elated when one of the students noticed a small colonial hydrozoan
growing in a part of the tank far from the location of the original
colony. The teacher was apparently unaware that these hydrozoans
exhibit _____.
a medusa stage
Which of the following is characteristic of the phylum Platyhelminthes?
They are dorsoventrally flattened.
Members of the phylum Mollusca _____.
are soft-bodied and often covered by a shell
A marine biologist dredges up a small animal from the bottom of the ocean. It is uniformly segmented, with short, stiff appendages and soft, flexible skin. It has a complete digestive system and a closed circulatory system, plus multiple true coeloms. Based on this, you determine that the animal must be a(n) _____.
annelid
You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?
It has not coelom.
Which structure do sea slugs use to feed on their prey?
a radula
Which one of these mollusk groups can be classified as suspension feeders?
bivalves
Which characteristic is shared by cnidarians and flatworms?
a digestive system with a single opening
What structure is responsible for gas exchange in most spiders?
book lungs
You find a multi-legged animal in your garden and want to determine if it is a centipede or a millipede. You take the animal to a university where a myriapodologist quickly tells you that you have found a centipede. Which of the following may have allowed her to make this distinction?
poisonous fangs
All arthropods _____.
1) undergo complete metamorphose
2)
have jointed appendages
3) molt
4) have segmented
bodies
5) have an exoskeleton or cuticle
2, 3, 4, 5
What would be the most direct effect of removing or damaging an insect's antennae? The insect would have trouble _____.
smelling
The heartworms that can accumulate within the hearts of dogs and other mammals have a pseudocoelom, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?
Nematoda
The water vascular system of echinoderms _____.
functions in locomotion and feeding
Which of the following combinations correctly matches a phylum to its description?
Echinodermata – bilateral symmetry as a larva, water vascular system
Sponges _____.
have larvae which are motile and move via the motion of cilia
What would be the best anatomical feature to look for to distinguish a gastropod from a chiton?
number of shell plates
Planarians lack dedicated respiratory and circulatory systems because _____.
none of their cells are far removed from the gastrovascular cavity or from the external environment
Which of the following are thought to be most closely related to humans?
sea stars
The bivalves started to die one by one; only the undamaged shells remained. To keep the remaining bivalves alive, the teacher would most likely need to remove the _____.
sea star
Nematodes and arthropods both _____.
grow by shedding their exoskeleton