Test 2 Terms

Question 1

Pseudocoelomate

Answer 1

body cavity called a pseudocoel. located between mesoderm and endoderm. Ex. Nematoda

Question 2

Acoelomate

Answer 2

no body cavity. Ex.Flatworms

Question 3

Coelomate

Answer 3

Fluid-filled body cavity which develops entirely within the mesoderm. Ex. Annelida

Question 4

Schizocoel

Answer 4

true coelom arises through splitting of mesoderm

Question 5

Enterocoel

Answer 5

true coelom arises as pouches of primitive gut

Question 6

Protostome

Answer 6

the mouth develops first during gastrulation.
Blastopore is animals mouth; anus develops after at the other end

Question 7

Deuterostome

Answer 7

the anus develops first during gastrulation.
Blastopore is the animal’s anus and the mouth develops after at the other end

Question 8

Blind sac gut

Answer 8

Only one opening or ingestion and egestion; the mouth

Question 9

Complete gut

Answer 9

has a mouth for ingestion and an anus for egestion

Question 10

Morula

Answer 10

Solid ball of cells after cleavage

Question 11

Blastula

Answer 11

Hollow ball of cells

Question 12

Gastrula

Answer 12

blastula folded inward at one point to form a hollow sac with an opening at 1 end (blastopore). is an embryo

Question 13

Cleavage

Answer 13

The process where a zygote undergoes a series of mitotic division

Question 14

Bilateral Symmetry

Answer 14

Body design in which body has a right and left half that are mirror images of each other

Question 15

Radial Symmetry

Answer 15

body design in which body parts are arranged around a central axis and any plane passing through central axis produces 2 mirror images halves

Question 16

Diploblastic Body Wall

Answer 16

have 2 cellular layers, outer ectoderm and an inner endoderm.

Question 17

Triploblastic Body Wall

Answer 17

have 3 cellular layers, ectoderm, mesoderm and endoderm

Question 18

Determinate Cleavage

Answer 18

spiral cleavage (ball is smaller at the top and then expands further down)

Question 19

Indeterminate Cleavage

Answer 19

Radial Cleavage (ball is completely spherical, equal all around)

Question 20

Paratomy

Answer 20

Clonal reproduction where a chain of fully formed zooids separate by fission.

Question 21

Architomy

Answer 21

Clonal reproduction by division into fragments. Each forms a cyst and the whole worm regenerates.

Question 22

Homocellular Ovary

Answer 22

Yolk is an integral part of the egg

Question 23

Heterocellular Ovary

Answer 23

Ovary ha 2 regions, germamium to produce egg
and vitellarium where yolk filled cells are produced and surrounds egg.

Question 24

Open Circulatory System

Answer 24

Blood flows in open spaces called sinuses.

Question 25

Closed Circulatory System

Answer 25

blood flows through definite blood vessels with secondary pumping organs

Question 26

Connectives

Answer 26

connects 2 dissimilar ganglia/nerve cords

Question 27

Commissures

Answer 27

connects 2 similar nerve cords/ ganglia

Question 28

Compare digestive system, mode of feeding and digestion in flatworms, roundworms and molluscs.

Answer 28

Flatworms (Platyhelminthes)
Digestive System- Blind sac gut
Mouth -> Pharynx (digestive mucus) ->

Mode of feeding-
Digestion-

Roundworms (Nematoda)
Digestive System- Complete Gut
Mode of feeding-
Digestion-

Molluscs
Digestive System- Complete Gut
Mode of feeding-
Digestion-

Question 29

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