Exam 13: Radiate Animals

Explain the controversy over distinguishing the body symmetry of cnidarians.

Water in the gastrovascular cavity serves as a ________________ skeleton.

The body wall of a hydra consists of an outer epidermis and an inner gastrodermis with _______________ between them.

Gastric filaments bearing _________________ are found in scyphozoan medusae.

Digestion in hydra is

Nematocysts are expelled when the

The gastrodermal tubes that run through the extensive mesoglea of alcyonarians are called _______________.

Hermatypic corals have mutualistic algal cells in their tissues called

The small organs of equilibrium in scyphozoan jellyfishes are called ______________,and these are borne in more complex sense organs called rhopalium.

The polypoid stage of scyphozoans is called ________________.

Hermaphroditic sea anemones that produce sperm first and eggs later,to prevent self-fertilization,are called

To help overcome prey,some sea anemones have ____________ with nematocysts and gland cells that protrude through the mouth or pores.

A living anemone must detect non-living debris that floats by from potential food that also move past it.How does it detect the difference?

Ctenophores are propelled by eight plates bearing long,fused _____________.

Nematocysts are stinging organelles contained inside cells called __________________.

Which association of anthozoan traits is NOT correct?

The _____ stage is best adapted for cnidarians living in colonies while the ____ stage helps in dispersal and survival in open oceans.

The unique feature(s)of a cnidarian nervous system is/are

Sea anemones and corals lack

Ctenophores capture food by