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Question
Which of the following groups of animals is having tube in tube body plan?
Which of the following groups of animals is having tube in tube body plan?
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Solution
The correct option is D Aschelminthes (Round worms)
Tube within tube body plan It is found in higher animal groups from nematodes to chordates. The body consists of two openings i.e., one for ingestion and one for egestion.
It is further divided into two types
(a) Protostomous plan (Proto-first; stoma-mouth) found in non-chordates like flatworms,
roundworms, annelids, molluscs and arthropods. In this mouth is derived from the blastopore of the embryo and anus is formed later.
(b) Deuterostomous plan It is found in echinoderms, hemichordata and chordates. In this, anus is derived from the blastopore and mouth arises at the opposite end.So the correct answer is ' Aschelminthes (Round worms) '
Tube within tube body plan It is found in higher animal groups from nematodes to chordates. The body consists of two openings i.e., one for ingestion and one for egestion.
It is further divided into two types
(a) Protostomous plan (Proto-first; stoma-mouth) found in non-chordates like flatworms,
roundworms, annelids, molluscs and arthropods. In this mouth is derived from the blastopore of the embryo and anus is formed later.
(b) Deuterostomous plan It is found in echinoderms, hemichordata and chordates. In this, anus is derived from the blastopore and mouth arises at the opposite end.
So the correct answer is ' Aschelminthes (Round worms) '
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