Question
What is the basic body plan of animals?
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Answer
Animals have three basic body plan as given below:
- Cell aggregate body plan: Cells are loosely arranged and do not organise to form tissues, e.g., sponges.
- Blind sac body plan: Body has a cavity that helps in digestion with a single opening, the mouth, e.ge coelenterates.
- 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.
- 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.
- Deuterostomous plan: It is found in echinoderms, hemichordata and chordates. In To this, anus is derived from the blastopore and mouth arises at the opposite end.
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