BIOLOGY 1407 EXAM 3 QUESTIONS WITH VERIFIED
ANSWERS
Define the 3 layers of an animal embryo - Answers - Ectoderm, Mesoderm, and
Endoderm
What tissues do the 3 embryotic layers turn into? - Answers - Ectoderm-Bone, muscle
connective tissue
Mesoderm-lungs, digestive system,
Endoderm-Nerves, brain
Define Radial symmetry and give example - Answers - the condition of having similar
parts regularly arranged around a central axis
Jellyfish and hydras have this
Define Bilateral symmetry and give example - Answers - an imaginary plane divides an
object into right and left halves, each side being a mirror image of the other
Humans, dogs, most animals
Define Cephalization and what kind of animals have this? - Answers - tendency in the
development of animals to localization of important organs or parts (brain) in or near the
head.
Most bilateral animals have this trait
Define incomplete vs complete digestive system - Answers - Incomplete just has one
hole for eating and secreting wastes
Complete has two openings each having its own function
Give the 3 classes of "body cavity" - Answers - Coelom, Pseudocoelom, and
Acoelomates
Define each class of body cavity - Answers - Coelom- body cavity
Pseudocoelom- fake body cavity
Acoelomate- no body cavity
Define open vs closed circulatory system - Answers - Closed-Heart pumps blood
through a continuous vessel system
Open-blood just leaves vessels
Define Adaptive Radiation - Answers - evolution of a number of divergent species from
a common ancestor
ANSWERS
Define the 3 layers of an animal embryo - Answers - Ectoderm, Mesoderm, and
Endoderm
What tissues do the 3 embryotic layers turn into? - Answers - Ectoderm-Bone, muscle
connective tissue
Mesoderm-lungs, digestive system,
Endoderm-Nerves, brain
Define Radial symmetry and give example - Answers - the condition of having similar
parts regularly arranged around a central axis
Jellyfish and hydras have this
Define Bilateral symmetry and give example - Answers - an imaginary plane divides an
object into right and left halves, each side being a mirror image of the other
Humans, dogs, most animals
Define Cephalization and what kind of animals have this? - Answers - tendency in the
development of animals to localization of important organs or parts (brain) in or near the
head.
Most bilateral animals have this trait
Define incomplete vs complete digestive system - Answers - Incomplete just has one
hole for eating and secreting wastes
Complete has two openings each having its own function
Give the 3 classes of "body cavity" - Answers - Coelom, Pseudocoelom, and
Acoelomates
Define each class of body cavity - Answers - Coelom- body cavity
Pseudocoelom- fake body cavity
Acoelomate- no body cavity
Define open vs closed circulatory system - Answers - Closed-Heart pumps blood
through a continuous vessel system
Open-blood just leaves vessels
Define Adaptive Radiation - Answers - evolution of a number of divergent species from
a common ancestor
