Question

Hydra is a

• A. fresh water animal
• B. diploblastic animal
• C. radially symmetrical & acoelomate animal
• D. all of these

Answer 1

The correct option is D all of these

Hydra belongs to the phylum Cnidaria, is a fresh water form. They are sessile, free swimming invertebrates. Cnidarians exhibit a blind sac body plan and are radially symmetric. They are more advanced than sponges in having true tissues. They are, however, acoelomate. Body wall consists of only two cells layers, ectoderm is separated by a jelly-like mesoglea from endoderm. These animals are therefore diploblastic, that is, arising from two embryonic cell layers.