Chapter 33 – Campbell 7th – Invertebrates
Note: Remember the diversity unit of the course wants you to have a general
understanding of what these organisms are and where they fit with all the other living
organisms. One should also be aware of the variety of organisms and the basic
processes of these organisms. Organs system comparison of through the
invertebrates was covered in other chapters dealing with specific systems. Be aware of
where these organisms fit in the classification system studied in Chapter 32. Much of
this should have been covered in previous biology courses.
1. Be able to distinguish between the eumatozoa, bilateria and deuterostomia?
2. Be able to explain sponges feed. Not overly necessary to know the name of every structure
but be aware of the process.
3. Be able to idemtify organism of the Phylum Cnidaria and distinguish between the basic
shapes of the cnidarians - polyp and a medusa.
4. Be able to identify the organisms of the Phylum Platyhelminthes.
5. Be able to identify the organisms of the Phylum Mollusca.
6. Be able to describe how many molluscs obtain their food.
7. Be able to explain the term trochophore larvae.
8. Be able to identify the organisms of the Phylum Annelida.
9. Be able to describe how the earthworm obtains and digests its food
10. Be able to describe how the earthworm circulatory system functions. (Pg 654)
11. Be able to identify the organisms of the Phylum Arthropoda.
12. Be able to describe the arthropod exoskeleton and explain why molting is necessary in
these organisms.
13. Be able to identify the basic anatomy of the grasshopper (Pg 660)
14. Be able to identify the organisms of the Phylum Echinodermata.
15. Be able to describe how a water vascular system works in the echinoderms.
The Big Picture – Putting the Pieces Together and Making Connections
• The main thing to look at in this chapter is to know the basic members of each
phylum. Also be aware of the circulatory, digestive and nervous system
comparisons between each.
• The invertebrate systems are often connected with the human systems as a
method to compare their development.
• The evolution of animal structures can be demonstrated through comparisons
of the systems in the previous point. Be aware of the coelomic development
found in each phylum and the type of symmetry in each. (Important)
***Please note the above big picture points are not made to make you study more.
You just have to take what you have learned and make the connections!!
Horton AP Biology
Campbell 7th Edition
Horton AP Biology
Campbell 7th Edition