Question

Coelom is absent in a)echinodeata (b)annelida(c) platyhelninths(d)mollusa

Answer 1

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Here is your answer⬇️⬇️

Coelom is absent in platyhelminthes.

The body us bilaterally symmetrical.

There are three layers of cells from which diffenrented tissues can be made, that is why such animals called triploblastic.

There is no true body cavity or coelom.

The body us flattened,that is why such animals called flat worms.

They are either free living or parasitic.

Some exampled of free living animals like planarians, or parasitic animals like liverflukes and tapeworm

Hope my answer helps you

Answer 2

Definition of Coelom

It is a fluid filled cavity between the body wall and digestive tract. The internal organs are suspended in it. Based on coelom animals can be:

1. Acoelomate
2. Pseudocoelomate
3. Eucoelomate
4. Haemocoelomate

Functions of coelom:

1. Provides space for body organs to remain suspended and compartmentalised.
2. Coelom acts as shock absorber.
3. Provides medium for circulation
4. Temporary storage of wastes.
5. Site of maturation of gametes.

In platyhelminthes coelom is absent. The space between body organs and body wall is filled with mesenchyme or parenchyma derived from embryonic mesoderm.

Therefore the answer is Platyhelminthes.