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Questions and Answers
Which of the following statements is true regarding the kingdom Animalia?
Which of the following statements is true regarding the kingdom Animalia?
What is the correct phylum for roundworms?
What is the correct phylum for roundworms?
Which order of the phylum Nematoda includes Ascaris?
Which order of the phylum Nematoda includes Ascaris?
Ancylostoma is an example of which order in the phylum Nematoda?
Ancylostoma is an example of which order in the phylum Nematoda?
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Which of the following is not part of the subkingdom Metazoa?
Which of the following is not part of the subkingdom Metazoa?
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What is the primary function of the renette gland in the excretory system?
What is the primary function of the renette gland in the excretory system?
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How many long longitudinal nerve cords extend posteriorly from the circumpharyngeal nerve ring?
How many long longitudinal nerve cords extend posteriorly from the circumpharyngeal nerve ring?
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What is unique about the circulatory and respiratory systems in the body structure described?
What is unique about the circulatory and respiratory systems in the body structure described?
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Which structure opens by a ventral excretory pore behind the mouth?
Which structure opens by a ventral excretory pore behind the mouth?
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What type of nerve structure extends anteriorly towards the mouth?
What type of nerve structure extends anteriorly towards the mouth?
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What is the reproductive system characteristics of most nematodes?
What is the reproductive system characteristics of most nematodes?
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What role do spicules play in the reproductive process of nematodes?
What role do spicules play in the reproductive process of nematodes?
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Which anatomical feature is primarily involved in the mating process of nematodes?
Which anatomical feature is primarily involved in the mating process of nematodes?
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During nematode mating, where is the sperm introduced?
During nematode mating, where is the sperm introduced?
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What term describes the body cavity of nematodes where their reproductive organs are located?
What term describes the body cavity of nematodes where their reproductive organs are located?
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What structure unites with the anal passage in the cloaca?
What structure unites with the anal passage in the cloaca?
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Which of the following structures is associated with the dorsal side of the anal passage?
Which of the following structures is associated with the dorsal side of the anal passage?
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Which components make up the female reproductive organs that lie in the pseudocoel?
Which components make up the female reproductive organs that lie in the pseudocoel?
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What is contained within the sac of the penis?
What is contained within the sac of the penis?
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Where are the female reproductive organs located in relation to the pseudocoel?
Where are the female reproductive organs located in relation to the pseudocoel?
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What shape is the fertilized ovum of the Ascaris?
What shape is the fertilized ovum of the Ascaris?
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What does the outer surface of the fertilized ovum of Ascaris consist of?
What does the outer surface of the fertilized ovum of Ascaris consist of?
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After mating, what does a female Ascaris do?
After mating, what does a female Ascaris do?
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What is the structure that surrounds the zygote of Ascaris?
What is the structure that surrounds the zygote of Ascaris?
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How many cells does the fertilized ovum of Ascaris contain?
How many cells does the fertilized ovum of Ascaris contain?
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How do infections typically occur regarding the ingestion of eggs?
How do infections typically occur regarding the ingestion of eggs?
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What happens after a host swallows embryonated eggs?
What happens after a host swallows embryonated eggs?
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What is a common way for children to ingest embryonated eggs?
What is a common way for children to ingest embryonated eggs?
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What is the fate of the tiny juveniles after they hatch from eggs in the host?
What is the fate of the tiny juveniles after they hatch from eggs in the host?
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What is a potential risk factor for infection related to children's play habits?
What is a potential risk factor for infection related to children's play habits?
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Study Notes
Kingdom and Phylum
- Kingdom: Animalia
- Subkingdom: Metazoa
- Phylum: Nemathelminths
- Class: Nematoda (Roundworms)
Nematoda Characteristics
- Body: Cylindrical, bilaterally symmetrical, unsegmented
- Size: 1/10 mm to 1 meter in length
- Sexes: Usually separate
- Habitat: Free-living or parasitic; found in plants and animals
- Body Structure: Tube within a tube; outer body wall; inner alimentary canal; pseudocoelom houses reproductive organs
- Cuticle: Tough, flexible; molts 4 times during life
- Nervous system: Circum-pharyngeal nerve ring; longitudinal and shorter nerves extending to the mouth
- Excretory system: Removes excess water and metabolic wastes via a renette gland with a ventral excretory pore
- Digestive system: Alimentary canal; opens by mouth and anus.
Ascaris Species
- Order: Ascaridata
- Example: Ascaris
- Order: Strongyleta
- Example: Ancylostoma
Ascaris Life Cycle
- Eggs are released by the female in the host's feces.
- Embryos develop into infective juveniles.
- Ingestion of eggs leads to hatching in the small intestine.
- Larvae migrate to the lungs via blood.
- Larvae coughed up, swallowed, and reach adult stage in the small intestine.
Additional notes
- Females are usually larger than males
- Parasitic or free-living
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Description
Explore the fascinating world of Nematoda, including their unique characteristics and the life cycle of the Ascaris species. This quiz covers their anatomical features, habitat, and reproductive processes. Test your knowledge on these essential roundworms!
