Question

1).Distinguish between Platyhelminthes and Nemathelminthes

Answer 1

Nematoda:

They are bilaterally symmetrical and triploblastic.

They have a cylindrical body with tapering ends.

They have an organ system level of organization.

They are parasitic animals.

False body cavity or pseudocoelom is present.

Examples are Ascaris , Wuchereria.....

Platyhelminthes:

They are mostly parasitic (e.g. tapeworm, liver flukes). However, some may be free living (e.g. Planaria).

True body cavity is absent.

They show bilateral symmetry.

They show an organ level of organization.

In addition to ectoderm and endoderm, a layer of cells called mesoderm is found between these two layers. Therefore, these are triploblastic animals.

Examples - Planareia, Liverfluke, Tape worm.....
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Answer 2

PLATYHELMINTHES
                        no coelom
                        called as flat worms
                        free living or parasite
                        example : liverfluke , planaria
NEMATHELMINTHES
                        pseudo coelom 
                        mostly parasitic
                        called as round worms
                        example ascaris,wulchereria