Phylum Nemathelminthes includes these very common organisms, some of which are parasitic and most of which are often found in soil. Which of the following is it?
A
Segmented worms
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B
Flatworms
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C
Earthworms
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D
Roundworms
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Solution
The correct option is C Roundworms Phylum Nemathelminthes comprises of animals commonly called as nematodes or roundworms. They are the parasite as they derive nutrients from the host and causes infection to the host organism. They either transmitted through contaminated food or water from soil containing roundworm or directly attached to the skin. Roundworm includes Ascaris, hookworm, pinworm etc. whereas earthworm, a segmented worm lives in soil but are decomposers. Flatworms are the pond water parasite. Thus, the correct answer is option D.