PCA NEMATODES EXAM NEWEST WITH COMPLETE 200 QUESTIONS
AND CORRECT DETAILED ANSWERS| BRAND NEW VERSION!
1. A nematode is recovered from a soil sample and identified as a microscopic,
unsegmented, cylindrical organism with a complete digestive tract
extending from a mouth to an anus. Which characteristic most strongly
supports its classification as a nematode?
A. Presence of jointed appendages
B. Presence of an unsegmented cylindrical body and complete digestive
tract
C. Presence of a segmented body with paired parapodia
D. Presence of a flattened body without a digestive tract
Answer: B. Presence of an unsegmented cylindrical body and complete
digestive tract
2. A plant-parasitic nematode penetrates a plant root and feeds using a
specialized stylet that pierces plant cells. Which structure is primarily
responsible for this feeding activity?
A. Spicule
B. Bursa
C. Stylet
D. Pharyngeal bulb
Answer: C. Stylet
3. A nematode population is being examined under a microscope, and the
organisms have elongated, threadlike bodies that taper toward both ends.
Which body plan is most characteristic of nematodes?
A. Cylindrical and generally tapered at the ends
B. Flattened and leaf-shaped
C. Segmented with paired legs
D. Radially symmetrical with tentacles
Answer: A. Cylindrical and generally tapered at the ends
pg. 1
, 4. A researcher compares nematodes with annelid worms and notes that
nematodes lack obvious external segmentation. Which feature distinguishes
nematodes from segmented worms?
A. Nematodes possess a pseudocoelom and generally lack external
segmentation
B. Nematodes possess jointed appendages
C. Nematodes have a body divided into repeated segments
D. Nematodes lack a digestive tract entirely
Answer: A. Nematodes possess a pseudocoelom and generally lack external
segmentation
5. A soil-dwelling nematode is examined for its outer covering, which provides
protection and is periodically shed as the organism grows. What is this
external covering called?
A. Cuticle
B. Peritoneum
C. Mantle
D. Epidermal shell
Answer: A. Cuticle
6. A nematode increases in size but cannot simply expand its rigid outer
covering continuously. Which process allows the animal to increase body
size?
A. Budding
B. Binary fission
C. Molting
D. Fragmentation
Answer: C. Molting
7. A nematode specimen is found to have a fluid-filled body cavity that is not
completely lined by mesodermal tissue. Which type of body cavity is
characteristic of nematodes?
A. Coelom
B. Pseudocoelom
pg. 2
, C. Hemocoel
D. Acoelom
Answer: B. Pseudocoelom
8. A plant-parasitic nematode penetrates a root and begins extracting
nutrients from living plant cells. Which feeding structure is most directly
involved in piercing the plant tissue?
A. Bursa
B. Spicule
C. Stylet
D. Tail papilla
Answer: C. Stylet
9. A nematode's pharynx contracts rhythmically to move food or plant cell
contents toward the intestine. Which type of musculature is particularly
important for this pumping action?
A. Circular skeletal muscle
B. Radial cardiac muscle
C. Longitudinal body-wall muscle
D. Smooth muscle rings surrounding the entire body
Answer: C. Longitudinal body-wall muscle
10. A laboratory examines a nematode and finds a complete digestive tract with
separate openings for ingestion and elimination. What advantage does this
digestive arrangement provide?
A. Food can move in one direction through specialized digestive regions
B. Food must enter and leave through the same opening
C. Digestion occurs exclusively inside individual cells
D. Nutrients bypass the digestive system completely
Answer: A. Food can move in one direction through specialized digestive
regions
11. A nematode is found feeding on plant roots, and its anterior region contains
a muscular pharynx connected to a stylet. Which ecological classification is
most appropriate?
pg. 3
, A. Plant-parasitic nematode
B. Predatory arthropod
C. Fungal pathogen
D. Photosynthetic microorganism
Answer: A. Plant-parasitic nematode
12. A farmer notices patches of stunted plants in a field. Root examination
reveals numerous microscopic worms associated with root lesions. Which
factor should be considered when assessing possible nematode-related
crop damage?
A. Plant species, nematode species, population density, and environmental
conditions
B. Only the color of the leaves
C. Only the age of the farmer
D. Only the amount of sunlight received
Answer: A. Plant species, nematode species, population density, and
environmental conditions
13. A nematode feeds on plant roots but does not remain permanently inside
the root. Which feeding habit best describes this organism?
A. Ectoparasitic feeding
B. Endoparasitic feeding
C. Saprophytic feeding only
D. Hematophagous feeding
Answer: A. Ectoparasitic feeding
14. A nematode enters plant tissue and spends much of its feeding period
within the root. Which feeding habit is most consistent with this behavior?
A. Ectoparasitism
B. Endoparasitism
C. Predation
D. Detritivory
Answer: B. Endoparasitism
pg. 4
AND CORRECT DETAILED ANSWERS| BRAND NEW VERSION!
1. A nematode is recovered from a soil sample and identified as a microscopic,
unsegmented, cylindrical organism with a complete digestive tract
extending from a mouth to an anus. Which characteristic most strongly
supports its classification as a nematode?
A. Presence of jointed appendages
B. Presence of an unsegmented cylindrical body and complete digestive
tract
C. Presence of a segmented body with paired parapodia
D. Presence of a flattened body without a digestive tract
Answer: B. Presence of an unsegmented cylindrical body and complete
digestive tract
2. A plant-parasitic nematode penetrates a plant root and feeds using a
specialized stylet that pierces plant cells. Which structure is primarily
responsible for this feeding activity?
A. Spicule
B. Bursa
C. Stylet
D. Pharyngeal bulb
Answer: C. Stylet
3. A nematode population is being examined under a microscope, and the
organisms have elongated, threadlike bodies that taper toward both ends.
Which body plan is most characteristic of nematodes?
A. Cylindrical and generally tapered at the ends
B. Flattened and leaf-shaped
C. Segmented with paired legs
D. Radially symmetrical with tentacles
Answer: A. Cylindrical and generally tapered at the ends
pg. 1
, 4. A researcher compares nematodes with annelid worms and notes that
nematodes lack obvious external segmentation. Which feature distinguishes
nematodes from segmented worms?
A. Nematodes possess a pseudocoelom and generally lack external
segmentation
B. Nematodes possess jointed appendages
C. Nematodes have a body divided into repeated segments
D. Nematodes lack a digestive tract entirely
Answer: A. Nematodes possess a pseudocoelom and generally lack external
segmentation
5. A soil-dwelling nematode is examined for its outer covering, which provides
protection and is periodically shed as the organism grows. What is this
external covering called?
A. Cuticle
B. Peritoneum
C. Mantle
D. Epidermal shell
Answer: A. Cuticle
6. A nematode increases in size but cannot simply expand its rigid outer
covering continuously. Which process allows the animal to increase body
size?
A. Budding
B. Binary fission
C. Molting
D. Fragmentation
Answer: C. Molting
7. A nematode specimen is found to have a fluid-filled body cavity that is not
completely lined by mesodermal tissue. Which type of body cavity is
characteristic of nematodes?
A. Coelom
B. Pseudocoelom
pg. 2
, C. Hemocoel
D. Acoelom
Answer: B. Pseudocoelom
8. A plant-parasitic nematode penetrates a root and begins extracting
nutrients from living plant cells. Which feeding structure is most directly
involved in piercing the plant tissue?
A. Bursa
B. Spicule
C. Stylet
D. Tail papilla
Answer: C. Stylet
9. A nematode's pharynx contracts rhythmically to move food or plant cell
contents toward the intestine. Which type of musculature is particularly
important for this pumping action?
A. Circular skeletal muscle
B. Radial cardiac muscle
C. Longitudinal body-wall muscle
D. Smooth muscle rings surrounding the entire body
Answer: C. Longitudinal body-wall muscle
10. A laboratory examines a nematode and finds a complete digestive tract with
separate openings for ingestion and elimination. What advantage does this
digestive arrangement provide?
A. Food can move in one direction through specialized digestive regions
B. Food must enter and leave through the same opening
C. Digestion occurs exclusively inside individual cells
D. Nutrients bypass the digestive system completely
Answer: A. Food can move in one direction through specialized digestive
regions
11. A nematode is found feeding on plant roots, and its anterior region contains
a muscular pharynx connected to a stylet. Which ecological classification is
most appropriate?
pg. 3
, A. Plant-parasitic nematode
B. Predatory arthropod
C. Fungal pathogen
D. Photosynthetic microorganism
Answer: A. Plant-parasitic nematode
12. A farmer notices patches of stunted plants in a field. Root examination
reveals numerous microscopic worms associated with root lesions. Which
factor should be considered when assessing possible nematode-related
crop damage?
A. Plant species, nematode species, population density, and environmental
conditions
B. Only the color of the leaves
C. Only the age of the farmer
D. Only the amount of sunlight received
Answer: A. Plant species, nematode species, population density, and
environmental conditions
13. A nematode feeds on plant roots but does not remain permanently inside
the root. Which feeding habit best describes this organism?
A. Ectoparasitic feeding
B. Endoparasitic feeding
C. Saprophytic feeding only
D. Hematophagous feeding
Answer: A. Ectoparasitic feeding
14. A nematode enters plant tissue and spends much of its feeding period
within the root. Which feeding habit is most consistent with this behavior?
A. Ectoparasitism
B. Endoparasitism
C. Predation
D. Detritivory
Answer: B. Endoparasitism
pg. 4
