Question

Which animal phylum is known as Flat worms? 1. Ctenophora 2. Cnidaria 3. Platyhelminthes 4. Annelida

Answer 1

Answer:

3. Platyhelminthes

Explanation:

Platyhelminthes are also called flat worms as they have dorso-ventrically flattened body structure.

platy means flat and helminth means worm

Answer 2

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➠ Which animal phylum is known as Flat worms?

1. Ctenophora

2. Cnidaria

3. Platyhelminthes

4. Annelida

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☯ Platy = Flat + Helminthes = Worm

▶ Members have dorsoventrally flattened body i.e. why the term flatworms .

▶ Members are generally parasites in animals , including humans few are free living fresh water form like planaria .

▶ Flatworms are triploblastic , bilaterally symmetrical , acoelomate eith blind sac body plan .

▶ Digestion - Absent in Tapeworm and Incomplete in rest of the Flatworms.

▶ Excretion - Protonephridia is responsible for excretion and osmoregulation . Moreover , members are ammonotelic .

▶ Cephalisation was first of all originated in flatworms .

▶ Fertilisation is internal , members are oviparous , development is indirect .

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1. Dugesia
2. Fasciola
3. Taenia Solium
4. Schistosoma
5. Echinococcus

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