Question

General body plan, symmetry and coelom are similar in
A. platyhelminthes and Annelids
B.Coelenterates and Echinoderms
C.Arthropods and Annelids
D.Aschelminthes and platyhelminthes

Answer 1

Hint: Body plan is the basic shape of members of an animal phylum; the general structure each individual organism assumes as it develops .
Symmetry -Animals can be categorised on the basis of their symmetry.When any plane passing through the central axis of the body divides the organism into two identical halves it is called radial symmetry.
coelom-In most animals it consists of main body cavity.It allows the internal organs to move and grow independently of the outer layer of the body wall

Complete answer:
Let’s discuss the question and find the correct answer.
-platyhelminthes and Annelids-platyhelminthes have dorso-ventrally flattened body hence called flat worms.these are mostly endoparasites found in animals including human beings.Flatworms are bilaterally symmetrical,triploblastic and acoelomate animals with organ level of organism.
Annelids can be aquatic free-living and sometimes it may be parasitic type.They exhibit organ-system level of body organisation and bilateral symmetry.They are triploblastic,metamerically segmented and coelomate animals.
Hence, Option a is correct.

Note: Fertilisation in platyhelminthes is internal and development is through many larval stages. Examples are Taenia, fasciola and in Annelida Reproduction is sexual eg-Nereis, Hirudinaria.