1. Essential Natural Science 1
Unit 4
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2. Essential Natural Science 1
Unit 4
Contents
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Invertebrates
Porifera and Cnidaria
Porifera
Cnidaria
Platyhelminthes
Characteristics
Molluscs
Characteristics
Classification
Arthropods
Characteristics
Classification
Orders of insects
Insect mouths
Metamorphosis
Echinoderms
Characteristics
Classification
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Annelids
Characteristics
Nematodes
Characteristics

3. Essential Natural Science 1
Unit 4
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What are porifera
like?
What are cnidaria
like?
How are molluscs
classified?
What are
molluscs like?
What are
arthropods like?
How are
arthropods
classified?
What are insect
mouths like?
Metamorphosis
of the monarch
butterfly
What are
echinoderms
like?
How are
echinoderms
classified?
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What are
Platyhelminthes
like?
LinksInteractive
activity: What do
you know about
invertebrates?
Animation:
Arthropods
What are
Annelids like?
What are
Nematodes like?
Orders of insects

4. Essential Natural Science 1
Unit 4
What are porifera like?
Sponges
osculum
channels
atrium
cavity
Porifera have
no organs.
water + nutrients
water
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pores

5. Essential Natural Science 1
Unit 4
ENLARGE IMAGE
• radial symmetry
• soft body
• tentacles
• gastrovascular cavity
• carnivorous
What are cnidaria like?
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6. Essential Natural Science 1
Unit 4
What are cnidaria like?
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• radial symmetry
• soft body
• tentacles
• gastrovascular cavity
• carnivorous
CoralsGO BACK
jellyfish

7. Essential Natural Science 1
Unit 4
What are platyhelminthes like?
Platyhelminthes (flatworms)
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• flat bodies
• divided into rings
• hermaphrodites
Taenia tapeworm (parasite)
soft body
bilateral symmetry
no skeleton

8. Essential Natural Science 1
Unit 4
What are nematodes like?
Nematodes (roundworms)
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soft body
bilateral symmetry
no skeleton
Pinworm
• cylindrical bodies
• no segments
• no respiratory system
• examples: trichina worms, pinworms

9. Essential Natural Science 1
Unit 4
What are annelids like?
Annelids (segmented worms)
Earthworm
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• cylindrical bodies
• divided into segments
• some are hermaphrodites
soft body
bilateral symmetry
no skeleton
segments
clitellum
head
body wall
digestive tube
setae (hairs)
coelom

10. Essential Natural Science 1
Unit 4
What are molluscs like?
• bilateral symmetry
• soft body
• carnivores and herbivores
• lungs (terrestrial molluscs)
• gills (aquatic molluscs)
• metamorphosis
valves
head
foot
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visceral mass

11. Essential Natural Science 1
Unit 4
What are molluscs like?
shell
valves
stomach
lung
eyes
mouth
ENLARGE IMAGE
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visceral mass
• bilateral symmetry
• soft body
• carnivores and herbivores
• lungs (terrestrial molluscs)
• gills (aquatic molluscs)
• metamorphosis

12. Essential Natural Science 1
Unit 4
What are molluscs like?
radula
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shell
valves
stomach
lung
eyes
visceral mass
mouth
• bilateral symmetry
• soft body
• carnivores and herbivores
• lungs (terrestrial molluscs)
• gills (aquatic molluscs)
• metamorphosis
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13. Essential Natural Science 1
Unit 4
How are molluscs classified?
snail
slug
limpet
Cephalopods
Bivalves
octopus
Gastropods
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nautilus cuttlefish
scallop
mussel

14. Essential Natural Science 1
Unit 4
Animation: Arthropods
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OPENOPEN

15. Essential Natural Science 1
Unit 4
• bilateral symmetry
• exoskeleton
• feeding habits vary
• trachea (terrestrial arthropods)
• gills (aquatic arthropods)
• moulting and metamorphosis
What are arthropods like?
abdomen
thorax
head
ENLARGE IMAGE
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ENLARGE IMAGE
Wasp

16. Essential Natural Science 1
Unit 4
• bilateral symmetry
• exoskeleton
• feeding habits vary
• trachea (terrestrial arthropods)
• gills (aquatic arthropods)
• moulting and metamorphosis
What are arthropods like?
ocellus
compound eye
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antenna
wings
legs
mouth parts
ENLARGE IMAGE

17. Essential Natural Science 1
Unit 4
• bilateral symmetry
• exoskeleton
• feeding habits vary
• trachea (terrestrial arthropods)
• gills (aquatic arthropods)
• moulting and metamorphosis
What are arthropods like?
cephalothorax
chelicerae pedipalp
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ENLARGE IMAGE
abdomen
Spider
legs

18. Essential Natural Science 1
Unit 4
Crustaceans
How are arthropods classified?
Myriapods
Insects
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Arachnids

19. Essential Natural Science 1
Unit 4
Orders of insects
Hymenoptera
Dermaptera
Lepidoptera
Diptera
Orthoptera
Coleoptera
Hemiptera
Odonata Siphonaptera
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20. Essential Natural Science 1
Unit 4
What are insect mouths like?
Ants have mouths
for chewing.
Bees have mouths
for chewing and sucking.
Butterflies have mouths
for sucking.
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Mosquitoes have mouths
for piercing and sucking.

21. Essential Natural Science 1
Unit 4
Ants have mouths
for chewing.
What are insect mouths like? GO BACK
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Bees have mouths
for chewing and sucking.
Butterflies have mouths
for sucking.
Mosquitoes have mouths
for piercing and sucking.

22. Essential Natural Science 1
Unit 4
Butterflies have mouths
for sucking.
What are insect mouths like? GO BACK
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Ants have mouths
for chewing.
Bees have mouths
for chewing and sucking.
Mosquitoes have mouths
for piercing and sucking.

23. Essential Natural Science 1
Unit 4
Ants have mouths
for chewing.
Bees have mouths
for chewing and sucking.
Butterflies have mouths
for sucking.
Mosquitoes have mouths
for piercing and sucking.
What are insect mouths like? GO BACK
HOME RESOURCES ACTIVITY LINKSCONTENTS
CLOSEBACK

24. Essential Natural Science 1
Unit 4
Ants have mouths
for chewing.
Bees have mouths
for chewing and sucking.
Butterflies have mouths
for sucking.
Mosquitoes have mouths
for piercing and sucking.
What are insect mouths like? GO BACK
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CLOSEBACK

25. Essential Natural Science 1
Unit 4
The Metamorphosis of a Monarch butterfly
SANTILLANA
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26. Essential Natural Science 1
Unit 4
The metamorphosis of a Monarch butterfly
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END
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27. Essential Natural Science 1
Unit 4
What are echinoderms like?
• radial symmetry in adults
• internal skeleton of plaques
• carnivores
• most breathe through skin
• metamorphosis
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arms
ambulacral
system
symmetrical planes

28. Essential Natural Science 1
Unit 4
ambulacral
system
What are echinoderms like?
• radial symmetry in adults
• internal skeleton of plaques
• carnivores
• most breathe through skin
• metamorphosis
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arms
symmetrical planes ambulacral feet

29. Essential Natural Science 1
Unit 4
How are echinoderms classified?
Echinoidea Ophiuroidea
CrinoideaHolothuroideaStelleroidea
sea urchin ophiura
starfish sea cucumber
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sea lily

30. Essential Natural Science 1
Unit 4
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Interactive activity: What do you know about invertebrates?
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OPENOPEN

31. Essential Natural Science 1
Unit 4
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