Bilateria And Platyhlminthes - Flatworms

Question 1

Describe atleast 5 points of what makes a bilaterial organism

Answer 1

1. Most animals are in the clade bilateria
2. The are mostly locomotory animals
3. Have bilateral symmetry
4. Have cephalisation (most the sense organisms in the head)
5. Are tripoblastic
6. Have true organs and are coelomates

Question 2

What is a Platyhelminthes?

Answer 2

Its a FLATWORM!!!!!

Think platy flatly

Question 3

Describe some features of Platyhelminthes - think habitat, germ layers, their cavities, lineages

Answer 3

1. They live in marine environments
2. They undergo tripoblastic development in blastula
3. Are acoelomates (no body cavity)
4. No circulatory system - they are internal parasites so use their hosts
5. Two lineages - catenulid and rhhabditphora

Question 4

What is special about the Platyhelminthes’s skeleton? How does it maintain its shape?

Answer 4

Its a hydro skeleton, that maintains its shape because of the fluid from the mesoderm

Question 5

How does gas exchange occur in the Platyhelminthes? How does this help with locomotion

Answer 5

The ciliated hairs on the epidermis allow diffusion to occur.

Helps them glide through water

Question 6

Which is true about the Platyhelminthes reproductive system:

A: asexual budding
B: sexual reproductive with the sperm and ovum
C: monoecious - both male and female reproductive organs
D: Sexual reproduction through sperm released in waterways

Answer 6

C!!!!

They are monoecious

Question 7

Tell me four classes of Platyhelminthes…..

TU LI
TR ODA
MO NEA
CE ODA

Answer 7

Turbellaria (NZ flatworm)
Trematoda (flukes)
Mono genea (type of ectoparasite) a
Cestoda