GEL 113 Homework 7 Answer sheet

Study Questions for Chapter 5 - Non-Amniotic Vertebrates

Part I: True or False:

1.T 2.T 3.F 4.T 5.F 6.F

Part II: Multiple Choice:

1.D 2.B 3.B 4.B 5.D 6.A 7.C 8.C

Part III. Thought questions:

1. Agnatha - fish lacking jaws

Placodermi - extinct armored fish having jaws bearing bony plates instead of teeth

Chondrichthyes - fish with skeletons of cartilage and pelvic claspers

Osteichthyes - the familiar bony fish, which lack pelvic claspers

Amphibia - tetrapods that practice non-amniotic reproduction

Reptilia - amniotic tetrapods lacking either mammary glands or feathers

Mammalia - amniotic tetrapods having mammary glands

Aves - amniotic tetrapods having feathers and forelimbs specialized for flight

2. A higher vertebrate is one which practices amniotic reproduction. The three classes are reptiles, mammals and birds.

3. The lobe-finned fish are significant in vertebrate history because they gave rise to the amphibians.

4. Amphibians fertilize their eggs externally. They are non-amniotic. Young are born as larval stages with gills which then metamorphose into adult form.

Reptiles fertilize their eggs within the mother. They are amniotic. Young are born as small versions of adults with no gills or larval stage.