Body Plans

Question 1

Body plan

Answer 1

Structural characteristics of an organism that separates it from other organisms or groups of organisms

Question 2

Symmetry

Answer 2

The quality of being made up of exact similar parts facing each other

Question 3

Cephalization

Answer 3

When Most of the sense organs , feeding appendages and the brain are near the anterior part of the body

Question 4

Coelom

Answer 4

Internal fluid filled cavity that develops in the mesoderm of triploblastic animals and separates digestive tract from body

Question 5

Asymmetry

Answer 5

No symmetry

E.g sponge

Question 6

Radial symmetry

Answer 6

Can be cut in more than one vertical plane through centre

Question 7

Bilateral symmetry

Answer 7

Can only be cut in one vertical plane

Question 8

Germ layers

Answer 8

Group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues

Question 9

Ectoderm

Answer 9

Outer germ layer

Question 10

Endoderm

Answer 10

Inner germ layer

Question 11

Mesoderm

Answer 11

Germ layer between ectoderm and endoderm

Question 12

Diploblastic

Answer 12

2 germ layers ( radial symmetry )

Question 13

Triploblastic

Answer 13

3 germ layers (bilateral symmetry)

Question 14

Acoelomate

Answer 14

Has no cavity in mesoderm

Eg flat worm

Question 15

Pseudocoelomate

Answer 15

Has a coelom but is not seen as a ‘true’ coelom because it is not surrounded by mesoderm tissue

Question 16

Coelomate

Answer 16

Has a true coelom , cavity in mesoderm

Question 17

Through gut

Answer 17

Incoming food does not mix with outgoing digestive remains