Bio 1500 Exam 4: Ch 33 comprehensive
Questions and Answers with Verified
Solutions
Question 1:
The Bilateria group of animals is characterized by which type of body
symmetry?
Answer:
Bilateral symmetry
Question 2:
Which term describes an animal that lacks a true coelom (body cavity)
and has its body tissues entirely filled with mesodermal tissue? A.
Diploblastic B. Coelomate C. Pseudocoelomate D. Acoelomate
Answer:
Acoelomate
Question 3:
The traditional classification of Bilaterians is primarily based on the
condition of their:
Answer:
Coelom (body cavity)
Question 4:
Compared to radially symmetric animals, the bilateral symmetry of
Bilateria primarily allows for:
Answer:
Specialization of body regions (cephalization)
,Question 5:
Which of the following is an example of an Acoelomate Bilaterian? A.
Platyhelminthes (Flatworms) B. Annelids (Segmented worms) C. Porifera
(Sponges) D. Nematodes (Roundworms)
Answer:
Platyhelminthes (Flatworms)
Question 6:
The Phylum Platyhelminthes is named based on the Greek words 'platy'
and 'helminth,' which mean:
Answer:
Flat and parasitic worm
Question 7:
Which of the following describes the musculature of the Phylum
Platyhelminthes? A. Poorly developed, relying mainly on hydrostatic
pressure. B. Absent, as movement relies solely on water currents.
Answer:
Well-developed, forming a sophisticated musculoskeletal system.
Question 8:
How do many free-living Platyhelminthes move across surfaces?
Answer:
By means of ciliated ventral epithelial cells. Many flatworms glide using
cilia on their ventral surface, often coupled with muscular contractions.
, Question 9:
Platyhelminthes can be found in which of the following habitats?
Answer:
Marine, freshwater, and terrestrial environments.
Question 10:
What is the typical size range of a flatworm (Phylum Platyhelminthes)?
Answer:
1 mm to many meters
Question 11:
Which term describes the body consistency of Platyhelminthes? A.
Chitinous B. Calcified C. Rigid D. Soft-bodied
Answer:
Soft-bodied
Question 12:
Why are parasitic flatworms often called 'helminths'?
Answer:
The Greek word 'helminth' means 'parasitic worm.'
Question 13:
The digestive system of Platyhelminthes is characterized by having a
single opening that serves as both mouth and anus. What is this type of
digestive system called?
Answer:
Blind gut
Questions and Answers with Verified
Solutions
Question 1:
The Bilateria group of animals is characterized by which type of body
symmetry?
Answer:
Bilateral symmetry
Question 2:
Which term describes an animal that lacks a true coelom (body cavity)
and has its body tissues entirely filled with mesodermal tissue? A.
Diploblastic B. Coelomate C. Pseudocoelomate D. Acoelomate
Answer:
Acoelomate
Question 3:
The traditional classification of Bilaterians is primarily based on the
condition of their:
Answer:
Coelom (body cavity)
Question 4:
Compared to radially symmetric animals, the bilateral symmetry of
Bilateria primarily allows for:
Answer:
Specialization of body regions (cephalization)
,Question 5:
Which of the following is an example of an Acoelomate Bilaterian? A.
Platyhelminthes (Flatworms) B. Annelids (Segmented worms) C. Porifera
(Sponges) D. Nematodes (Roundworms)
Answer:
Platyhelminthes (Flatworms)
Question 6:
The Phylum Platyhelminthes is named based on the Greek words 'platy'
and 'helminth,' which mean:
Answer:
Flat and parasitic worm
Question 7:
Which of the following describes the musculature of the Phylum
Platyhelminthes? A. Poorly developed, relying mainly on hydrostatic
pressure. B. Absent, as movement relies solely on water currents.
Answer:
Well-developed, forming a sophisticated musculoskeletal system.
Question 8:
How do many free-living Platyhelminthes move across surfaces?
Answer:
By means of ciliated ventral epithelial cells. Many flatworms glide using
cilia on their ventral surface, often coupled with muscular contractions.
, Question 9:
Platyhelminthes can be found in which of the following habitats?
Answer:
Marine, freshwater, and terrestrial environments.
Question 10:
What is the typical size range of a flatworm (Phylum Platyhelminthes)?
Answer:
1 mm to many meters
Question 11:
Which term describes the body consistency of Platyhelminthes? A.
Chitinous B. Calcified C. Rigid D. Soft-bodied
Answer:
Soft-bodied
Question 12:
Why are parasitic flatworms often called 'helminths'?
Answer:
The Greek word 'helminth' means 'parasitic worm.'
Question 13:
The digestive system of Platyhelminthes is characterized by having a
single opening that serves as both mouth and anus. What is this type of
digestive system called?
Answer:
Blind gut
