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, little Tommy (a student in an undersupervised class of 40 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
A) teeth marks.
B) spines.C) spicules.
D) nematocysts.
E) a radula.
Answer: D
How many of the following organisms possess bilateral symmetry as adults?
1. sponges2. molluscs
3. echinoderm
4. sea anemones
5. ectoprocts
A) one of these
B) two of these
C) three of these
D) four of these
E) five of these
Answer: D
If the teacher wanted to show the students what a lophophore is and how it works, the teacher would point out a feeding
A) hydra.B) sponge.
C) bivalve.
D) gastropod.
E) ectoproct.
Answer: E
The bivalves started to die one by one; only the undamaged shells remained. To keep the remaining bivalves alive, the teacher would have to remove the
A) sea anemones.B) sea star.
C) gastropods.
D) ectoprocts.
E) parrotfish.
Answer: B
If the teacher had used a dissecting microscope to examine the outer surfaces of the empty bivalve shells, the teacher would probably have seen marks that had been left by
A) jaws.
B) nematocysts.
C) tubefeet.
D) a lophophore.
E) a madreporite.
Answer: C
The teacher was unaware of the difference between suspension feeding and predation. The teacher thought that providing live copepods (2 mm long) and feeder fish (2 cm long) would satisfy the dietary needs of all of the organisms. Consequently, which two organisms would have been among the first to starve to death (assuming they lack photosynthetic endosymbionts)?
A) sponges and corals
B) sea stars and sponges
C) shrimp and bivalves
D) corals and bivalves
E) bivalves and sponges
Answer: E
If the teacher had wanted to demonstrate that some invertebrates possess a closed circulatory system, the teacher should have removed and dissected a
A) mollusc.B) sea star.
C) shrimp.
D) polychaete.
E) parrotfish.
Answer: D
Had the teacher wanted to point out organisms that belong to the most successful animal phylum, the teacher should have chosen the
A) bivalves and gastropods.
B) sea anemones and hydra.
C) shrimp and copepods.
D) polychaete.
Answer: C
Learn More :
Biology
- Which era is known as the "age of reptiles"?
- Why is the amniotic egg considered an important evolutionary breakthrough?
- Which of these are amniotes?
- What should be true of fossils of the earliest tetrapods?
- A trend first observed in the evolution of the earliest tetrapods was
- Arrange these taxonomic terms from most inclusive (most general) to least inclusive (most specific). 1. lobe-fins 2. amphibians 3. gnathostomes 4. osteichthyans 5. tetrapods
- Which of the following belongs to the lobe-fin clade?
- The swim bladder of ray-finned fishes
- There is evidence that ray-finned fishes evolved
- Which group's members have had both lungs and gills during their adult lives?
- Which of these statements accurately describes a similarity between sharks and ray-finned fishes?
- To which of the following are the scales of chondrichthyans most closely related in a structural sense?
- Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
- Jaws first occurred in which extant group of fishes?
- The lamprey species whose larvae live in freshwater streams, but whose adults live most of their lives in seawater, are similar in this respect to certain species of
- A team of researchers has developed a poison that has proven effective against lamprey larvae in freshwater cultures. The poison is ingested and causes paralysis by detaching segmental muscles from the skeletal elements. The team wants to test the poison's effectiveness in streams feeding Lake Michigan, but one critic worries about potential effects on lancelets, which are similar to lampreys in many ways. Why is this concern misplaced?
- The earliest known mineralized structures in vertebrates are associated with which function?
- The feeding mode of the extinct conodonts was
- Lampreys differ from hagfishes in
- What do all craniates have that earlier chordates did not have?
- How many of the following statements about craniates is (are) correct? 1. Craniates are more highly cephalized than are noncraniates. 2. Craniates' genomic evolution includes duplication of clusters of genes that code for transcription factors. 3. The craniate clade is synonymous with the vertebrate clade. 4. Pharyngeal slits that play important roles in gas exchange originated in craniates. 5. The two-chambered heart originated with the early craniates.
- A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
- Which extant chordates are postulated to be most like the earliest chordates in appearance?
- Which of the following statements would be least acceptable to most zoologists?
- Chordate pharyngeal slits appear to have functioned first as
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