Ch. 28 Invertebrate Biology Assessment

Front

What is a gemmule?

Back

A gemmule is a structure produced by asexual reproduction in freshwater sponges, serving as a dormant stage that can survive unfavorable conditions.

Front

What is the function of a choanocyte in sponges?

Back

Choanocytes are specialized cells in sponges that generate water currents and trap food particles for feeding.

Front

Describe the medusa body plan in cnidarians.

Back

The medusa is a free-floating body plan of cnidarians characterized by a bell-shaped structure with the mouth located on the underside.

Front

What is the cuticle in Ecdysozoa?

Back

The cuticle is a tough external layer in Ecdysozoa that requires periodic molting for growth.

Front

Define hemocoel.

Back

Hemocoel is the internal body cavity found in arthropods, serving as a space for the circulation of hemolymph.

Front

What is the role of spicules in sponges?

Back

Spicules are structural elements found in sponges that provide support and deter predators.

Front

What is the difference between polyp and medusa forms in cnidarians?

Back

The polyp form is sessile and cylindrical with the mouth facing upwards, while the medusa form is free-floating and bell-shaped with the mouth facing downwards.

Front

What are amoebocytes?

Back

Amoebocytes are versatile cells in sponges that play roles in digestion, nutrient transport, and the production of spicules.

Front

What is the significance of the osculum in sponges?

Back

The osculum is the large opening at the top of a sponge through which water exits after being filtered.

Front

What is mesoglea?

Back

Mesoglea is a gelatinous substance found between the epidermis and gastrodermis in cnidarians, providing structural support.