Topic 10 Terms (Intro to Animals)

Question 1

What defines Animalia?

Answer 1

multicellular heterotrophs with
tissues

no cell walls

monophyletic group

Question 2

How do animals reproduce?

Answer 2

gametic meiosis

Question 3

Order of embryo development

Answer 3

zygote > morula > blastula > gastrula

ZM BG

Question 4

diploblastic

Answer 4

2 cell layers in embryo

ectoderm: outer layer and nervous system
endoderm: inner layer and gut

Question 5

triploblastic

Answer 5

3 cell layers in embryo

mesoderm: middle layer where most organs form from

Question 6

4 key transitions in body plan for metazoans

Answer 6

1. ) Radial symmetry
2. ) Body cavities
3. ) Protostome to deuterostome
4. ) Segmented body plan

Question 7

coelomate

Answer 7

fluid-filled cavity (coelom) in mesoderm, surrounded in mesodermal tissue

Question 8

pseudocoelmate

Answer 8

Pseudocoel between mesoderm and endoderm

Not completely covered in mesodermal tissue, so that’s why it’s a pseudocoelomate

Question 9

How protostomes develop

Answer 9

Spiral and determinate 8-cell stage

Mesoderm splits forming coelom

Mouth develops from blastopore

Question 10

How deuterostomes develop

Answer 10

Radial and indeterminate 8-cell stage

Mesodermal outpocketings of archenteron form coelom

Mouth develops from secondary opening