Question

Diploblastic, aquatic animals with tissue grade of organization belong to the phylum

• A. Protozoa
• B. Porifera
• C. Cnidaria
• D. Helminthes

Answer 1

The correct option is C

Cnidaria

The correct option is C:

Explanation of the correct option:

Option C:

1. Cnidarians are diploblastic organisms having two embryonic layers- ectoderm and endoderm.
2. Mesoderm is absent.
3. They are found in aquatic habitats and exhibit tissue level or organization.

Explanation of the incorrect option:

Option A:

The type of organization found in Protozoa is of protoplasmic or acellular level and is found in an aquatic environment.

Option B:

Porifera exhibit cellular-level of organization and are mainly marine.

Option D:

1. Platyhelminthes have organ level of organization and are acoelomates.
2. Nemathelminthes have tissue level of organization and are pseudocoelomates.

Final answer: Diploblastic, aquatic animals with tissue grade of organization belong to the phylum Cnidaria.