Topic 11

Question 1

Choanoflagellates

Answer 1

Protists; unicellular and
flagellated

Question 2

Collared Cells

Answer 2

food capture at base of flagella

Question 3

Radial symmetry

Answer 3

No front, back, left
or right

Question 4

Bilateral symmetry

Answer 4

Two axes of
orientation: front to
back and top to
bottom

Question 5

Ectoderm

Answer 5

surface tissue; creates outer covering and central
nervous system

Question 6

Endoderm

Answer 6

innermost tissue;
digestive tract and organ lining

Question 7

Mesoderm

Answer 7

fills the space between ectoderm and
endoderm

Question 8

Germ Layer

Answer 8

Number of tissues used to define clades

Question 9

Gastrulation

Answer 9

one end of the embryo
folds inwards

Question 10

Cleavage

Answer 10

Mitosis with no growth

Question 11

Phyla

Answer 11

Early branching animal clades

Question 12

Metazoa

Answer 12

Monophyletic clade of all animals and their shared ancestor.

Question 13

Sponges

Answer 13

No tissues
Basal animals

Question 14

Eumetazoa

Answer 14

Clade of animals with tissues

Question 15

Bilateria

Answer 15

Clade with Bilaterally
symmetrical organisms
Most animals in this clade