Define phylum nematode
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Answers
Answer:
The nematodes or roundworms constitute the phylum Nematoda, with plant-parasitic nematodes being known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments.
Symmetry:-
Nematodes have bilateral symmetry, which means there is a line lengthwise that can divide them into two equal halves that are mirror images. The heads of nematodes have radial symmetry which means that any line drawn through the center produces mirror images.
Features:-
Following are the important characteristics of Nematoda:
- Their body is bilaterally symmetrical and triploblastic.
- They are cylindrical in shape.
- They exhibit tissue level organization.
- Their body has a cavity or pseudocoelom.
Body cavity:-
Nematodes are round with a body cavity. They have one way guts with a mouth at one end and an anus at the other. They have a pseudocoelom that is lined on one side with mesoderm and on the other side with endoderm
Life cycle:-
The life cycle of a plant-parasitic nematode has six stages: egg, four juvenile stages and adult. Male and female nematodes occur in most species, but reproduction without males is common, and some species are hermaphroditic (Afemales@ produce both sperm and eggs). Egg production by the individual completes the cycle.
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