Aschelminthes: Roundworms — NEET Biology
📚 Practice ConceptThe body of the aschelminthes is circular in cross-section, hence, the name roundworms. They may be freeliving, aquatic and terrestrial or parasitic in plants and animals. Roundworms have organ-system level of body organisation. They are bilaterally symmetrical, triploblastic and pseudocoelomate animals. Alimentary canal is complete with a well-developed muscular pharynx. An excretory tube removes body wastes from the body cavity through the excretory pore. Sexes are separate (dioecious), i.e., males and females are distinct. Often females are longer than males. Fertilisation is internal and development may be direct (the young ones resemble the adult) or indirect.
Which of the above statements are correct regarding Phylum Aschelminthes? S1: The body of Aschelminthes is circular in cross-section, which is why they are commonly called roundworms. S2: They are bilaterally symmetrical, triploblastic, and pseudocoelomate animals. S3: Their alimentary canal is complete with a well-developed muscular pharynx, and waste removal occurs through nephridia. S4: Aschelminthes exhibit sexual dimorphism, with males and females being distinct, and females are often longer than males. S5: Development in Aschelminthes is always direct, where the young ones resemble the adult.
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