Sea anemone belongs to phylum coloentreta and they are diploblastic radially symmetrical

Diploblastic, radially symmetrical animal

The correct answer is option 'B', which states that a sea anemone is a diploblastic, radially symmetrical animal. Now let's understand why this answer is correct.

Diploblastic Animals:
Diploblastic animals are characterized by having two germ layers during their embryonic development. These layers are called the ectoderm and endoderm. The ectoderm forms the outer layer of the body, while the endoderm forms the inner layer. Between these two layers, there is a non-cellular layer called the mesoglea. Diploblastic animals lack a middle germ layer called the mesoderm. Examples of diploblastic animals include jellyfish, sea anemones, and corals.

Radial Symmetry:
Radial symmetry is a type of symmetry where the body parts of an organism are arranged around a central axis in a circular pattern. This arrangement allows the organism to be divided into multiple identical halves by any plane passing through the central axis. In animals with radial symmetry, there is no distinct head or tail region. Instead, body parts are arranged around the central axis like the spokes of a wheel. This type of symmetry is commonly observed in animals that are sessile or have slow movements. Sea anemones exhibit radial symmetry as their body parts are arranged around a central mouth.

Sea Anemone:
Sea anemones are marine animals belonging to the phylum Cnidaria, which also includes jellyfish and corals. Sea anemones are soft-bodied organisms that are typically attached to rocks or other substrates in the ocean. They have a cylindrical body with a central mouth surrounded by tentacles. These tentacles are armed with stinging cells called cnidocytes, which they use to capture and immobilize their prey. Sea anemones exhibit radial symmetry, meaning their body parts are arranged around the central mouth. They have two germ layers, the ectoderm and endoderm, with a gelatinous mesoglea layer in between. This makes them diploblastic organisms.

In conclusion, sea anemones are diploblastic, radially symmetrical animals. They have two germ layers (ectoderm and endoderm) and exhibit radial symmetry with their body parts arranged around a central mouth.