1.

Question 1

Name the 5 phyla from least complex to most complex:

Answer 1

1. Phylum Cnidaria
2. Phylum Platyhelminthes
3. Phylum Annelida
4. Phylum Arthropoda
5. Phylum Chordata

Question 2

Name examples of Cnidaria.

Answer 2

Jellyfish and hydra

Question 3

What type of symmetry do Cnidaria have?

Answer 3

Radial symmetry

Question 4

Are Cnidaria diploblasts or triploblasts?
What do these terms mean?

Answer 4

Cnidaria are diploblasts
Diploblasts - organisms possess two layers, the endoderm and the ectoderm
Triploblasts - organisms possess three layers, endoderm, ectoderm and mesoderm.

(Endoderm = innermost layer, mesoderm = middle layer, ectoderm = outermost layer)

Question 5

Do Cnidaria have an anus or coelom?

Answer 5

No, they don’t have an anus or coelom.

Coelom = body cavity filled with fluid where organs are suspended.

Question 6

What type of skeleton do Cnidaria have?
Do Cnidaria have segmentation?

Answer 6

Hydroskeleton
No segmentation

Question 7

Name examples of Platyhelminthes.

Answer 7

Flatworms, planarian & liver fluke.

Question 8

Are Platyhelminthes multicellular or unicellular?

Answer 8

Multicellular

Question 9

What kind of symmetry do Platyhelminthes show?

Answer 9

Bilateral symmetry

Question 10

Platyhelminthes are flattened…

Answer 10

Dorso -ventrally

Question 11

Are Platyhelminthes diploblasts or triploblasts?

Answer 11

Triploblasts

Question 12

Do Platyhelminthes have an anus or a coelom?

Answer 12

No anus
Acoelomate = no coelom

Question 13

What type of skeleton do Platyhelminthes have?

Answer 13

Hydroskeleton

Question 14

Do Platyhelminthes have segmentation?

Answer 14

No segmentation

Question 15

Describe Platyhelminthes organ systems.

Answer 15

Well-differentiated organ systems

Question 16

Name examples of Annelids.

Answer 16

Earthworms and lugworms

Question 17

Are annelids diploblasts or triploblasts?

Answer 17

Triploblasts

Question 18

What symmetry do Annelids show?

Answer 18

Bilateral symmetry

Question 19

Are annelids coelomate?

Answer 19

Yes (they have a coelom)

Question 20

Annelids have a _____ - _____ gut

Answer 20

One-way gut (mouth and anus)

Question 21

Annelids have segmentation. Describe this.

Answer 21

Each segment has its own muscle, blood vessel and nerve supplies. Some have reproductive organs.

Question 22

What type of skeleton do Annelids have?

Answer 22

Hydroskeleton

Question 23

Name examples of Arthropoda.

Answer 23

Insects and spiders

Question 24

What type of skeleton do Arthropoda have?

Answer 24

Exoskeleton

Question 25

Are Arthropoda diploblasts or triploblasts? What type of symmetry do they have?

Answer 25

Triploblasts Bilateral symmetry

Question 26

Describe the segmentation in Arthropoda.

Answer 26

- Fixed number of metameric segments - Greater degree of specialisation than Annalids.

Question 27

What is a notable fact about Arthropoda?

Answer 27

They are the most successful Phylum.

Question 28

Arthropoda are haemocoel. What does this mean?

Answer 28

They have a reduced coelom.

Question 29

Arthropoda have a brain. What is the term that describes the presence of a brain?

Answer 29

Cephalisation

Question 30

What else do Arthropoda have apart from a brain?

Answer 30

Ventral nerve cord Complete digestive system

Question 31

Name examples of Chordata.

Answer 31

Mammals and birds.

Question 32

What type of symmetry do Chordata show?

Answer 32

Bilateral symmetry

Question 33

Describe the coelom of Chordata.

Answer 33

Well-developed

Question 34

Describe the segmentation of Chordata?

Answer 34

Head, thorax and abdomen in humans.

Question 35

Do Chordata show cephalisation?

Answer 35

Yes - they have a brain

Question 36

Describe the nervous system of Chordata.

Answer 36

Complex

Question 37

In Chordata, segmented muscles are in __ _______ _____

Answer 37

An unsegmented trunk

Question 38

What type of circulatory system do Chordata have?

Answer 38

Closed circulatory system.

Question 39

Are Chordata coelomate?

Answer 39

Yes

Question 40

Chordata have a completed digestive system with the highest degree of specialisation. What else do they have?

Answer 40

Calcified bones Jointed limbs Highly differentiated tissues.

Question 41

For Annelids, gas exchange occurs along…..

Answer 41

The length of its body.

Question 42

Describe an insect.

Answer 42

3 pairs of jointed legs 2 pairs of wings Head, thorax and abdomen

Question 43

Describe a spider

Answer 43

Head and abdomen 4 pairs of jointed legs.

Question 44

Define radial symmetry

Answer 44

Body parts radiate out from a central point.

Question 45

Define bilateral symmetry

Answer 45

Right and left sides of the body are mirror images of each other.