BIO 1307 - Ch. 33.6-33.9: Protostomes
Which of the following are parts of the digestive system of nematodes?
Anus Pharynx Intestine Mouth Stylets
Which of the following characteristics are typical of bryozoans?
Anus opens near the mouth, due to its U-shaped digestive system Small, colonial animals
In arthropods, the hard Blank 1Blank 1 exoskeleton, Correct Unavailable provides protection and physical support, the jointed Blank 2Blank 2 appendages, Correct Unavailable provide flexibility, and the Blank 3Blank 3 locomotion, Incorrect Unavailable body plan allows specialization of different body parts.
Blank 1: exoskeleton Blank 2: appendages or legs Blank 3: segmented
Many arthropods possess tagmata. What are they?
Body segments that have become fused into functional units
Identify the phylum whose members have the following characteristics: Marine lophophorate organisms with two calcified valves (dorsal and ventral) that resemble shells.
Brachiopoda
Tubeworms, scaleworms, and lugworms are all members of which annelid class?
Errantia
Which of the following are the living classes within the phylum Arthropoda?
Hexapoda Myriapoda Chelicerata Crustacea
Which of the following is a major advantage of segmentation?
Individual segments can become specialized for different functions.
Which of the following characteristics are typical of bryozoans?
Live in colonies Ciliated lophophore U-shaped digestive system
Which of the following is NOT a nematode that causes disease in humans? Trichinella worms Liver flukes Intestinal roundworms Pinworms
Liver flukes
Each segment of an annelid contains which of the following?
Locomotory structures Excretory organs A ganglion
Unsegmented worms that are round in cross section, have longitudinal muscles, and are covered by a flexible, thick cuticle that is molted as they grow, belong to the phylum ________.
Nematode
The functions of the lophophore include which of the following?
Obtaining food Gas exchange
Polychaeata Clitellata
Parapodia present; many setae Clitellum present
Among annelids, the class ________ is characterized by the presence of many parapodia. The class ________ is characterized by the presence of a thickened band called the clitellum.
Plychaeata, Clitellata
Which of the following statements are true of nematode reproduction?
Reproduction is usually sexual Fertilization is internal
Which of the following statements describing nematode lifestyles are true?
They are active hunters that prey on protists and other small animals. They can be parasites of plants or larger animals.
Which of the following accurately describes the characteristics of nematodes?
They are bilaterally symmetrical. Muscles extend longitudinally beneath epidermis. They are covered by a flexible, thick cuticle that molts as they grow.
Which of the following worms can shorten but not change their diameter since they do not have circular musculature?
Trichinella
Which of the following characteristics are typical of brachiopods?
Two calcified valves: dorsal and ventral Lophophore between the shells
The annelid body plan can be described as which of the following?
a tube within a tube.
Annelids have a(n) ________ circulatory system.
closed
In an annelid, the digestive tract is suspended within the spacious ________ which is surrounded by the body wall.
coelom
Which of the following is TRUE of the muscular system of nematodes?
consists of longitudinal but not circular muscles
True or false: All members of the phylum Nematoda are parasites on plants or animals.
false (Many nematodes are active predators of protists and other small animals)
The lophophore, the structure characteristic of lophophorates, plays important roles in which of the following processes?
respiration, feeding
What feature of a body plan allows the specialization of different parts of the body for different function?
segmentation
Annelid segments are divided from one another internally by ________.
septa
Which of the following organisms are errantians?
tubeworms clamworms lugworms
