Invertebrate Lecture Worksheet
All Materials Cmassengale

 

1. Approximately what percentage of animals are invertebrates?

 2. What are invertebrates?

 

3. Name the phyla of invertebrates and members of each phyla.

 

  

Sponges

 4. __________ are in the phylum Porifera.  There are about _____ different species & most of  these are _________ organisms found in oceans & seas.  A few sponges are found in  __________, but these are small and not brightly colored.

 5. Sponges are _____________ that trap __________ from water as it flows through them.

 6. Sponges have no basic body arrangement and are said to be ________________.

 7. Sponges live attached to one spot as adults so they are __________.

 8. The skeleton of sponges is made of a flexible protein called ___________ and hard fibers  called __________ which are composed of calcium carbonate or silicon dioxide. 

9. Sponges are full of holes called __________ through which water flows into their __________  bodies. 

10. Sponges are the simplest animals and lack the __________ level of specialization like all other animals. Sponges do have some specialized _________ in their bodies.

11. Special cells called choanocytes line the pores and have __________ that spin to pull in water.

 12. __________cells at the base of choanocytes capture plankton from the water & start digesting it.

 13. _______________ are special cells that carry this food to all other parts of the sponge.

 14. Wastes and excess water leave a sponge through a large opening at the top called the   __________.

15. Sponges reproduce asexually by internal or external __________ and by _______________ whenever a piece of a sponge breaks off.  This last method helps sponges form   _____________.

16. Sponges reproduce sexually also and are _______________ producing both eggs and sperm.  Sponges __________ sperm with each other and do not fertilize their own eggs.

 17. Internal buds or ____________ form if the freshwater supply evaporates and are release  when the sponge __________ and become ___________ when freshwater returns.

 Cnidarians

 17. The phylum Cnidaria includes what organisms?

 

 18. All cnidarians are _______________ organisms except for the __________ which is found in freshwater.

19. Cnidarians all have _______________ symmetry and _____________ or arms that have stinging cells called _______________.  These stinging cells shoot out like a   _______________ and contain a __________ that can kill or paralyze their prey.

 20. Cnidarians have _____ body layers; an inner _______________ and an outer ____________.

 21. Cnidarians have _______ opening into their hollow bodies called the __________ so food enters and wastes leave through this same opening.  This is called a ________________ digestive system.

22. The hollow cavity the mouth opens into is called the ____________________ cavity.

23. Cnidarians have 2 body forms. ___________ forms have the mouth & tentacles located at the  top like Hydra, corals, and sea anemones. _____________forms like the jellyfish have their  tentacles and mouth located at the bottom.

 24. Some cnidarians like the _______________ go through both polyp and medusa forms in their life cycle. 

25. Cnidarians have a simple nerve _________ and can reproduce both _____________ and  _____________.

 26. Corals build _____________ cases that make underwater ___________.

Flatworms

 27. Flatworms are in the phylum _______________ and are flattened ______________ with  __________ symmetry.

28. Flatworms are said to be _________________ because of their solid body.

29. ___________and ____________ are parasitic flatworms having only _______ body opening called the _____________.

 30. Specialized _____________ cells remove wastes.

 31. The ______________ is the most common free living flatworm.  It is found in __________ or _____________ places.

32. Planarians produce both eggs and sperm and are said to be ________________; however, they _____________ sperm with other planarians.  Planarians also reproduce asexually by  _________________.

33. Flukes and tapeworms usually live in their host's ______________ tract resistant to digestive  _______________ allowing the __________ to digest their food.

34. Tapeworms are divided into sections called _________________ with complete  _________________ structures.  The head is called the _______________ and has both  _________________ and ______________ to attach to the host.   

35. Tapeworms are ___________________ and ______________ their own eggs which pass out of the host's body in ripe ____________________ along with feces. 

36. Humans get tapeworms from eating _______________________, while children pick up tapeworm eggs from ________________ boxes.

 Nematodes

 37. _______________ are in the phylum Nematoda and are _________________ in shape and  ________________ at both ends.

38. Roundworms are ____________________ because their body cavity or       ________________is not fully lined. The body cavity is filled with fluid giving them a   ____________________ skeleton against which _______________can contract.

 39. Roundworms have a complete gut with both a ______________ and an _____________