This is an exciting module in this science book, because we start dissecting. WooHoo!
The first half of this module is all about invertebrates. Spineless creatures. 🙂
First up were sponges. Very interesting. I had a hard time finding a handout with the sponge anatomy. I wished the book had a diagram of the sponge anatomy, I think it would have been helpful. I ended up handing out this , just for the students information. The only thing they really needed to know was:
- Collar Cell (choanocytes)
The prepared slide we had a look at was colorful. We were able to see the spicules very clearly. The students were to look for and identify the spicules shaped like needles, jack (multipronged), and barbed. We had a difficult time finding a barbed one.
Our favorite thing to talk about was the planaria. The students were really surprised this flatworm was able to regenerate any part and that they reproduced by simply tearing themselves in half. If I had planned carefully, I would have ordered live planaria to experiment with. Next year, I hope to be better prepared, because there is nothing like seeing these flatworms grown another head.
Since I didn’t have a live specimen, I found this wonderful video of a decapitated flatworm. It shows over several days what it looks like as it regenerates its head. Amazing. It makes you sit back and be in awe of God’s creation.
Next Tuesday we will be dissecting the worm. I am so looking forward to it. Be prepared to see gut pictures next week!
Want to see what else we have done in this class? Go to the Apologia Biology tab at the top of this page or click here.