1. 4/22 & 4/ th Grade Agenda
Learning Objective: Learn about mollusks & worms
Collect HW: Review & Reinforce p. 61 & 64
Squid Dissection
Video: BBC Life (Creatures of the Deep)
Textbook Reading 419 – 427
HW: Reading & Notetaking 201 – 204

2. Reflection
Prompt: Write 3 questions that you have about squids.

3. What are the major type of worms
Flatworms
Roundworms
Segmented Worms

4. Do worms have brains? Yes
They also have a heart, digestive tract and reproductive organs

5. Lifecycle of a tapeworm

6. An organism that lives inside or on another organism and takes its food from that organism is a P_______
arasite

7. Is an earthworm helpful?
Yes.
Earthworm dropping make the soil fertile. Earthworm tunnels loosen the soil and allow air, water, and plant roots through it

8. How do Earthworms Mate?
Earthworms are hermaphroditic meaning each worm has organs of both sexes.
One worm has to find another worm in order to mate

9. Do earthworms have eyes?
They do not have eyes
But they do possess light- and touch-sensitive organs (receptor cells) to distinguish differences in light intensity and to feel vibrations in the ground.

10. What is the "bump" in the middle of the earthworm?
The bump is the clitellum.
It contains the gland cells which secrete a slimy material (mucus) to form the cocoon which will hold the worm embryos.

11. Earthworm Cocoons

12. Virtual Dissection of Earthworm

13. What is the difference between front end and back end?
Front End (Anterior)
Back End (Posterior)

14. What is the difference between top side and bottom side?
Top side (Dorsal)
Bottom side (Ventral)

15. Dissecting the earthworm

16. Internal View

17. Aortic Arches (Primitive Heart)

18. Cross section view

19. Does earthworm have bilateral or radial symmetry?
Bilateral Symmetry

20. What some common properties of these animals?
What are Mollusks
What some common properties of these animals?
Mollusks are invertebrates with soft unsegmented bodies that are often protected by hard outer shells

21. Three major groups of mollusks
Gastropods (Single Shell)
Bivalves (Two Shells)
Cephalopods (Mollusks with tentacles)

22. Insides of a Squid