Phylum Cnidaria and Coelenterata Quiz

Habitat and Anatomy of Hydra

• Hydra inhabits freshwater environments, such as ponds, lakes, and slow-moving streams.

Reproductive Biology of Hydra

• Hydra reproduces asexually under favorable conditions, such as abundant food and suitable environment.

Feeding Habits of Hydra

• Hydra primarily feeds on small invertebrates, like brine shrimp and plankton, using its tentacles to capture prey.

Anatomy of Hydra

• Testes are found in the mesoglea, a gel-like substance between the ectoderm and endoderm layers in Hydra.

Excretory System of Platyhelminthes

• The main unit of the excretory system in Platyhelminthes is the protonephridium.

Reproductive Biology of Cnidarians

• Cnidarians undergo sexual reproduction, involving the formation of gametes.

Body Cavity of Cnidarians

• The gastrovascular cavity is a body cavity in cnidarians that helps in digestion, excretion, and gas exchange.

Characteristics of Hydrozoa

• The characteristic body form of the class Hydrozoa in the phylum Cnidaria is a cylindrical body with a terminal mouth and a ring of tentacles around it.

Classification of Cnidarians

• The class Anthozoa includes organisms such as coral and sea anemones.

Defense Mechanism of Cnidarians

• Nematoblasts, found in the body wall of cnidarians, function as a defense mechanism, injecting venom into predators or prey.