topic 13

Question 1

Bilaria

Answer 1

bilateral symmetry
tripoplast
cephalization
movement improved –> muscles

Question 2

Advantages of a coelem

Answer 2

Hydroskeleton
circulatory system
cushions organs

Question 3

Phylus Platyhelminates

Answer 3

-flatworms
-Acelomate
-do not have complete digestive system
-cillia: in epidermis, so that organs dont get crushed

Question 4

what limits flatworms size

Answer 4

division of labor

Question 5

Phylum Annelida

Answer 5

segmented
euceolomate
closed circulatory system
complete digestive system

Question 6

Clade Lophotrocazoan

Answer 6

-Lophophore: seccile larvae
-Trochophore: mobile larvae
-Polyphyletic
-Protosome

Question 7

Phylum Mollusca characteristics(and function)

Answer 7

-Mantle:might secret shell(calcareous)
-Foot: muscle(movement)
Visceral mass: organs
-specialized mouthparts(radula)

Question 8

Difference between earthworms leeches and Polychaeta

Answer 8

-earthworm: Oligochaeta, lack parapadia
-Polychaeta:have parapadia, bear chaetas(bristle)
-leeches: Hirudineans, lack chatae, no parapadia

Question 9

Gastropoda

Answer 9

snails and relatives
tortion: poo on back

Question 10

Class bivalvia

Answer 10

2 hinge
-NO RADULA
-filter feeder
lack of cephalization