1. Harcourt Science Unit B Chapter 3
Invertebrates
Harcourt Science Unit B
Chapter 3
Mrs. Strand
6th grade
Lockwood Middle School

2. Key Characteristics What are two characteristics of invertebrates?
No _______________________
Many have ________________________
View Invertebrates CD Intro

3. Comparative Study of Invertebrates
Characteristic
Sponges
Cnidarians
Worms
Mollusks
Echinoderms
Arthropods
Symmetry
Reproduction
Digestion
Protection
Picture
Due before test

4. Invertebrates
Terms
Vertebrates
Invertebrates
Endoskeleton
Exoskeleton

5. Two Types of Animals All animals have the same basic needs F______
If you want to guess what the animal eats, look at its _______.
Animals eat food to gain energy, but…
O______
Animals can’t make _________ without oxygen.
W_______
All animals are made up of cells which are made up mostly of ___________r.
P__________
Animals need protection from _______ and from __________.
Some adaptations include…
Sharp pointy teeth, flat teeth, Wedge teeth
Camouflage, grouping, poison, mimicking…

6. Invertebrates (96% of animal kingdom)
May have _____skeletons
May have j______
May have _________
Invertebrates Environments
They’re _______________!
Do WB pg 73

7. Sponges, Cnidarians, & Worms
Terms
Sponge
Cnidarian
Flatworm
Roundworm
Parasite
Segmented worm

8. Sponges, Cnidarians,& Worms
Filter ________ for food
Only _______ layers of cells
Some specialized cells to channel _______ or carry _______ to other parts of the sponge
Skeleton is formed by ________ of spicules
Most live in ________ _______ __________
Most reproduce _____________, but not all
Some smaller sponges live in fresh water
Color sponge picture

9. Biology Animals: sponges
Watch video segment
Biology Animals: sponges

10. Cnidarians All have the ability to _________________.
Cnidarians
All have the ability to _________________.
All are _____________.
The mouth is connected directly to the ___________ of the body.
Wastes leave through the ___________.
Don’t have s___________, but do have t__________.
All live in water, most in sea water.
Have _____________ symmetry.
Tissues are groups of cells working together.
All have a single opening with the tentacles surrounding the mouth.
Difference between a polyp and a medusa is the direction of the opening.
Color cnidarian picture

11. Biology Animals: Cnidarians & Echinoderms
Watch video segment
Biology Animals: Cnidarians & Echinoderms

12. Worms Have ____________ symmetry. Flatworms Flat bodies
Worms
Have ____________ symmetry.
Flatworms
Flat bodies
Digestive system with __________ opening
Simple n_______ s_________ in the head (eye spots)
Planarians have mouth at the end of a long tube.
Have reproductive systems.
Reproduce ___________
Can r_______________ parts.

13. Roundworm Roundworms Parasitic Worms Have round, tube-like bodies
Most are too _______ to be seen with the naked eye
Live in _____ types of environments.
Have ____________ system with two openings.
Muscles run _______________.
Have a _________ _________ with a brain and simple sense organs.
Reproduce ____________.
Many _________ the organisms in which they live. (hosts)
Parasitic Worms
___________ the host while __________ themselves.
Frequently have _________ life cycles.
Examples include h__________ and trichinella.
Transferred to humans through undercooked pork or sea food. NO PINK!

14. Segmented Worms Made up of connected ____________.
Bodies are more _________ than other worms.
Breath through their ________.
__________ goes right into the circulatory system.
Waste leaves the body through the anal pore.
Have two sets of __________.
Reproduce _____________.
Carbon dioxide leaves through the skin.
One set for contraction (lengthwise)… The other for extension (in bands).
All earthworms have both sexual parts.
Watch video segment
Biology Animals:Worms
Color worm picture
Do WB pg 78

15. worms

16. worms

17. worms

18. Mollusks, Arthropods, & Echinoderms
Terms
Mollusk
Arthropod
Arachnid
Insect
Echinoderm

19. Mollusks, Arthropods, & Echinoderms
More ________ than any animals studied before
Has a ________ body with no ________
“mollus” = soft
Most have a hard _________ for protection
This shell grows within their body and is formed by the ____________
Mollusks have a muscular “foot”
Mollusks reproduce __________
Release sex cells into water, fertilized eggs mature to larvae, and then adults
Some are bi________ and some are uni_________
Examples are clams, oysters, slugs,snails, squid and octapods
Watch video segment
Biology Animals:Mollusks
Color Land Snail

20. snail

21. snail

22. Arthropods
By far the l______________ phylum of animals (1million+species)
Have jointed exo____________
Muscular system allows for ________ movements
Skeleton does not ________ as animal grows
All have legs, a digestive system with ____ openings, a c__________ s________ and a b_________
Many have well-developed organs for s_____, s____ and t_________
Reproduce _______________
Female lays f_____________ eggs
Examples include: beetles, butterflies, spiders, shrimp, centipedes and scorpions
Watch video segment
Biology Animals:Arthropods
Color spider pictures (2)

23. Spider

24. Helpful & Harmful Arthropods
Fewer that 1% of arthropods are harmful
Helpful Arthropods
Harmful Arthropods
Color ant & lobster pictures

25. ant

26. lobstert

27. Echinoderms Have endo_____________ “echino” = spiny “derm” = skin
Live only in __________
Examples starfish, sand dollars sea urchins, and sea cucumbers
No b_______
___________l symmetry for body
Mouth is at ___________ of underside of body with powerful jaws
Tube ___________
Most reproduce ___________, but may also ___________ body parts
Color starfish picture
Do WB pg 83

28. starfish

29. Controlling Pests
This would be a great article to research for extra credit :-) pg B94-B95
Fill out graphic organizer
Do WB pg 84