Bio 1104 Test 2 Animal Diversity Questions
with Correct Answers 2025-2026
Ectoderm CORRECT ANSWER
One of the three primary (embryonic) germ layers formed during gastrulation. Ectoderm ultima
tely forms external structures such as the skin, hair, nails, and inner linings of the mouth and a
nus, as well as the entire nervous system. "outside"
Endoderm CORRECT ANSWER
Digestive tract lining; respiratory system; urinary bladder; digestive organs; liver; many glands "
inside"
Mesoderm CORRECT ANSWER
Embryonic tissue that forms tissues such as muscle, bone, and blood vessels (middle)
Cephilization CORRECT ANSWER
concentration of sensory organs and a brain in a defined head region -
> sensory organs nerve cells and organs for ingesting food
Coelom CORRECT ANSWER A fluid filled body cavity completely lined with mesoderm
Cnidocysts CORRECT ANSWER
All cnidarians have tentacles that are armed with rows of stinging
Protostome CORRECT ANSWER Animal whose mouth is formed from its blastopore
Deuterostome CORRECT ANSWER
animal whose anus is formed from the blastopore of a blastula
, Radial symmetry CORRECT ANSWER Symmetry about a central axis.
Bilateral CORRECT ANSWER can split into 2 along 1 plane
Coelomates CORRECT ANSWER Animals with a true coelom
(humans,annelids,arthropods)
Acoelomates CORRECT ANSWER Animals with no body cavity (flatworms)
Pseudocoelomates CORRECT ANSWER
An animal whose body cavity is not completely lined by mesoderm (roundworms, nematodes)
Digestive: incomplete CORRECT ANSWER a single opening to a pouch-
like cavity serves as both mouth and anus
Digestive: complete CORRECT ANSWER
A digestive tube with two openings, a mouth and an anus
Circ: none CORRECT ANSWER rely on diffusion
Circ: open CORRECT ANSWER heart,but limited blood vessels
Circ: closed CORRECT ANSWER heart and blood maintained entirely in vessels
Porifera CORRECT ANSWER
no germ layers or anything else, asymmetry, have both female and male parts, reproduce sexu
ally, water disperse the larve (sponge)
with Correct Answers 2025-2026
Ectoderm CORRECT ANSWER
One of the three primary (embryonic) germ layers formed during gastrulation. Ectoderm ultima
tely forms external structures such as the skin, hair, nails, and inner linings of the mouth and a
nus, as well as the entire nervous system. "outside"
Endoderm CORRECT ANSWER
Digestive tract lining; respiratory system; urinary bladder; digestive organs; liver; many glands "
inside"
Mesoderm CORRECT ANSWER
Embryonic tissue that forms tissues such as muscle, bone, and blood vessels (middle)
Cephilization CORRECT ANSWER
concentration of sensory organs and a brain in a defined head region -
> sensory organs nerve cells and organs for ingesting food
Coelom CORRECT ANSWER A fluid filled body cavity completely lined with mesoderm
Cnidocysts CORRECT ANSWER
All cnidarians have tentacles that are armed with rows of stinging
Protostome CORRECT ANSWER Animal whose mouth is formed from its blastopore
Deuterostome CORRECT ANSWER
animal whose anus is formed from the blastopore of a blastula
, Radial symmetry CORRECT ANSWER Symmetry about a central axis.
Bilateral CORRECT ANSWER can split into 2 along 1 plane
Coelomates CORRECT ANSWER Animals with a true coelom
(humans,annelids,arthropods)
Acoelomates CORRECT ANSWER Animals with no body cavity (flatworms)
Pseudocoelomates CORRECT ANSWER
An animal whose body cavity is not completely lined by mesoderm (roundworms, nematodes)
Digestive: incomplete CORRECT ANSWER a single opening to a pouch-
like cavity serves as both mouth and anus
Digestive: complete CORRECT ANSWER
A digestive tube with two openings, a mouth and an anus
Circ: none CORRECT ANSWER rely on diffusion
Circ: open CORRECT ANSWER heart,but limited blood vessels
Circ: closed CORRECT ANSWER heart and blood maintained entirely in vessels
Porifera CORRECT ANSWER
no germ layers or anything else, asymmetry, have both female and male parts, reproduce sexu
ally, water disperse the larve (sponge)
