1. 4/28 & 4/29 - 7th Grade Agenda HW: Reading & Notetaking 205– 206
Worms & Mollusks
Worm observation Lab
Video: BBC Life (Deep Ocean)
Textbook Reading 431 – 432
HW: Chap 11 Section 3 Reading Guide

2. Reflection
Prompt: Write 3 facts you know about squids.

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

4. 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.

5. 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.

6. Earthworm Cocoons

7. Virtual Dissection of Earthworm

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

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

10. Dissecting the earthworm

11. Internal View

12. Aortic Arches (Primitive Heart)

13. Cross section view

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

15. 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

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

17. Comparing Mollusks

18. Do Mollusks have Open or Closed Circulatory System?
Mollusks have Open Circulatory System: Blood is not always in blood vessels

19. What are Gastropods? Gastro = “stomach” Pod = “Foot”
Gastropods are both herbivores and carnivores

20. Snail’s Radula
Tiny teeth act like sandpaper and scrape food from leaf and ground

21. Valve = “Shell or Opening”
What are Bivalves?
Bi = “Two”
Valve = “Shell or Opening”
Mostly Omnivores

22. How clams dig in

23. What are Cephalopods?
Cephalo = “Head”
Pod= “Foot”

24. Reflection
Prompt: Write 5 facts that you learned in the video.