Biology 1407 Exam test quiz and
answers graded A+
Define the 3 layers of an animal embryo - ANS✅✅Ectoderm, Mesoderm, and Endoderm
What tissues do the 3 embryotic layers turn into? - ANS✅✅Ectoderm-Bone, muscle connective
tissue
Mesoderm-lungs, digestive system,
Endoderm-Nerves, brain
Define Radial symmetry and give example - ANS✅✅the condition of having similar parts regularly
arranged around a central axis
Jellyfish and hydras have this
Define Bilateral symmetry and give example - ANS✅✅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? - ANS✅✅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 - ANS✅✅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" - ANS✅✅Coelom, Pseudocoelom, and Acoelomates
Define each class of body cavity - ANS✅✅Coelom- body cavity
Pseudocoelom- fake body cavity
Acoelomate- no body cavity
, Define open vs closed circulatory system - ANS✅✅Closed-Heart pumps blood through a
continuous vessel system
Open-blood just leaves vessels
Define Adaptive Radiation - ANS✅✅evolution of a number of divergent species from a common
ancestor
What is the modern protist most closely related to animals? - ANS✅✅Choanoflagellates
What is the simplest known animal? - ANS✅✅Placozoans
No body symmetry, no tissues, just four cells!
Define Sponges - ANS✅✅Phylum: Porifera
No symmetry, tissues, organs
Sexual and asexual reproduction
Define Hermaphrodite - ANS✅✅Organism makes both eggs and sperm
Define Cnidarians - ANS✅✅Phylum: Cnidaria
Radial symmetry
Medusea drift and float, Polyps stay on ground
Jellyfish, squishy, hydra, anemones
What are the structures in Cnidarians that sting? - ANS✅✅Nematocysts, used in feeding or
defensing
Define Flatworms - ANS✅✅Phylum: Platyhelminthes
Hermaphrodite and no body cavity
What are Turbellarians, flukes (trematodes), tapeworms (cestodes) - ANS✅✅The 3 classes of
flatworms
answers graded A+
Define the 3 layers of an animal embryo - ANS✅✅Ectoderm, Mesoderm, and Endoderm
What tissues do the 3 embryotic layers turn into? - ANS✅✅Ectoderm-Bone, muscle connective
tissue
Mesoderm-lungs, digestive system,
Endoderm-Nerves, brain
Define Radial symmetry and give example - ANS✅✅the condition of having similar parts regularly
arranged around a central axis
Jellyfish and hydras have this
Define Bilateral symmetry and give example - ANS✅✅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? - ANS✅✅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 - ANS✅✅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" - ANS✅✅Coelom, Pseudocoelom, and Acoelomates
Define each class of body cavity - ANS✅✅Coelom- body cavity
Pseudocoelom- fake body cavity
Acoelomate- no body cavity
, Define open vs closed circulatory system - ANS✅✅Closed-Heart pumps blood through a
continuous vessel system
Open-blood just leaves vessels
Define Adaptive Radiation - ANS✅✅evolution of a number of divergent species from a common
ancestor
What is the modern protist most closely related to animals? - ANS✅✅Choanoflagellates
What is the simplest known animal? - ANS✅✅Placozoans
No body symmetry, no tissues, just four cells!
Define Sponges - ANS✅✅Phylum: Porifera
No symmetry, tissues, organs
Sexual and asexual reproduction
Define Hermaphrodite - ANS✅✅Organism makes both eggs and sperm
Define Cnidarians - ANS✅✅Phylum: Cnidaria
Radial symmetry
Medusea drift and float, Polyps stay on ground
Jellyfish, squishy, hydra, anemones
What are the structures in Cnidarians that sting? - ANS✅✅Nematocysts, used in feeding or
defensing
Define Flatworms - ANS✅✅Phylum: Platyhelminthes
Hermaphrodite and no body cavity
What are Turbellarians, flukes (trematodes), tapeworms (cestodes) - ANS✅✅The 3 classes of
flatworms
