Question

Give the characteristics of flat worms, round worms and segmented worms. Give their phylum.

Answer 1

Flat worms

Phylum - Platyhelminthes

Dorsoventrally flat, i.e. flat body from top to bottom.

No true body cavity.

Mostly hemaphrodite, i.e., male and female sex organs present in the same individual.

Round worms

Phylum - Nematoda

Body is cylindrical.

Pseudocoelom (Sort of body cavity).

Sexes are separate.

Segmented worms

Phylum - Annelida

Body is segmented from head to tail.

True body cavity.

May be unisexual or bisexual.