BIOL 152 EXAM 3- SYMMETRY

What three basic body plans of triploblasts relate to the presence or absence of a body cavity?

* No body cavity: acoelomate * Body cavity lined on the inner side by endoderm-derived tissue and on the outer side by mesoderm-derived tissue: pseudocoelomate * Body cavity lined entirely by mesoderm-derived tissue: coelomate

All coelomates are triploblast. True or False?

True.

What does an organism need to have in order to exhibit bilateral symmetry?

the body has left and right sides, a front and back, and a top and bottom.

What does an organism need to have in order to exhibit radial symmetry?

the body is wheel- or spoke-shaped, with no obvious front, back, right, or left.

What is the symmetry of a sponge?

Asymmetrical

What is the symmetry of a bobcat?

Bilateral

What is the symmetry of a octopus?

Bilateral

What is the symmetry of a snake?

Bilateral

What is the symmetry of a turtle?

Bilateral

What is the symmetry of a hydra?

Radial

What is the symmetry of a jellyfish?

Radial