Exam 2 Flashcards
(40 cards)
A small invertebrate animal was recently discovered and needs to be named and catalogued. This animal is known to be bilaterally symmetrical with minimal cephalization including ocelli. Gas exchange occurs through the skin. The animal has an incomplete digestive system that includes a pharynx and intestines. Dissection confirms the animal to be an acoelomate. Reproduction in the wild has not been observed but dissection shows the animal is monoecious.
Based on this description, what Phylum does this animal belong to?
Nemertea
Tardigrada
Cnidaria
Platyehelminthes
Nematoda
Platyehelminthes
A small invertebrate animal was recently discovered and needs to be named and catalogued. This animal is known to be bilaterally symmetrical with minimal cephalization including papillae and ocelli. The animal has a closed circulatory system comprised of a pair of blood vessels. Gas exchange occurs through the skin. The animal has a complete digestive system that includes a mouth, foregut, intestines and anus. Dissection confirms the animal to be an acoelomate. The animal is a predator that hunts using a long retractable structure with barbs at the end.
Based on this description, what Phylum does this animal belong to?
Nemertea
Platyhelminthes
Cnidaria
Nematoda
Tardigrada
Nemertea
A small invertebrate animal was recently discovered and needs to be named and catalogued. This animal is known to be bilaterally symmetrical with minimal cephalization . Gas exchange occurs through the skin. The animal has a complete digestive system that includes a mouth, pharynx, intestines and anus. Dissection shows a body cavity that is surrounded on only one side by mesoderm tissue. In addition to it’s epidermal cells, this animal was found to have an additional covering comprised of both collagen and chitin.
Based on this description, what Phylum does this animal belong to?
Cnidaria
Nematoda
Nemertea
Tardigrada
Platyhelminthes
Nematoda
A small invertebrate animal was recently discovered and needs to be named and catalogued. This animal is known to be bilaterally symmetrical with 4 pairs of legs. Gas exchange occurs through the skin. The animal has a complete digestive system that includes a mouth that excretes saliva. Dissection shows a body cavity surrounded completely by mesoderm tissue. The animal’s blood is contained within this body cavity. This animal has Malpighian tubules for metabolic waste removal.
Based on this description, what Phylum does this animal belong to?
Platyhelminthes
Nematoda
Nemertea
Tardigrada
Cnidaria
Tardigrada
Most species of the Superphylum Lophotrochozoa have either lophophores or a trochophore. Which of the following describes a lophophore?
a. Series of ciliated cells surrounding the organism’s mouth.
b. The invagination of the beginning of the archenteron.
c. Free-swimming larvae with two bands of ciliated cells.
d. Complete digestive system with ciliated cells on the inner lining.
Series of ciliated cells surrounding the organism’s mouth.
Phylum Platyhelminthes is the first animal group to have which organized system?
Respiratory
Excretory
Endoskeletal
Nervous
Excretory
Phylum Platyhelminthes and Phylum Nemertea have many things in common. What is one characteristics that differentiates them?
a. Nemertea has an excretory system.
b. Platyhelminthes has ocelli.
c. Platyhelminthes has a closed circulatory system.
d. Nemertea have a complete digestive system.
Which of the following is true of Phylum Nematoda?
a. They have a true coelom.
b.They are exclusively parthenogenic.
c. They have only longitudinal muscles.
d. They have a well developed excretory system.
c. They have only longitudinal muscles.
Animals within Phylum Tardigrada are very resistant to heat, pressure, desiccation, etc. They are able to temporarily halt metabolic activity - sometimes for years. What is this called?
Cryptobiosis
Hibernation
Estivation
Turpor
Cryptobiosis
So far this semester, you have learned about Ctenophora, Porifera, Cnidaria, Platyhelminthes, Nemertea, Nematoda, and Tardigrada, the different phyla have more and more complex adaptations. Which of the following are adaptations within Phylum Tardigrada but not within Phylum Cnidaria?
Bilateral symmetry
Gastrovascular cavity
Diploblast embryology
True respiratory system
Bilateral symmetry
What phylum do flatworms belong to?
Phylum Platyhelminthes
What type of body plan do organisms in Phylum Platyhelminthes exhibit?
Bilateral
What is the tissue organization of flatworms?
Triploblastic, acoelomate
What is the defining feature of the digestive system in flatworms?
Incomplete
What type of larvae do most species in Phylum Platyhelminthes have?
Trochophore larvae
What is the function of ocelli in flatworms?
Sense intensity of light
In flatworms, what type of reproduction is characterized by individuals evert their penises and attempt to stab each other?
Sexual reproduction via ‘penis fencing’
What is the primary excretory structure in flatworms?
Network of tubules connected to flame cells
True or False: Flatworms have a respiratory system.
False
What phylum do ribbon worms belong to?
Phylum Nemertea
What is a defining characteristic of Phylum Nemertea?
Eversible proboscis
What type of digestive system do organisms in Phylum Nemertea have?
Complete
Describe the circulatory system of Phylum Nemertea.
Closed circulatory system
What type of reproduction is common in Phylum Nemertea?
Typically exhibit courtship spawning and external fertilization
