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An animal lives in your small intestine, has a thread-like body and possesses a pseudocoelom. To which phylum does it belong?
AAschelminthes
BPlatyhelminthes
CAnnelida
DPorifera
Answer & Solution
Correct answer: A. Aschelminthes
1. The clues are: endoparasite of the intestine, thread-like body, pseudocoelom.
2. Thread-like round worms with a pseudocoelom are Aschelminthes.
3. Rule out Platyhelminthes: those are flat and acoelomate, not pseudocoelomate.
4. Annelida is segmented and eucoelomate, so it does not fit.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.77_
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