| 1. a. The organism is unicellular | go to 2 |
| Hint: - One-cell - Usually you can see through - May be a colony of individuals |
|
| b. The organism is multicellular | go to 11 |
| Hint:
- Many cells - Usually too thick to see through - Body parts visible: legs, eyes, antennae, digestive system (animals) - Cell walls visible (plants) |
|
| 2. a. Cilia (small hairs) are present | go to 3 |
| b. No cilia present | go to 6 |
| 3. a. Cilia cover entire body | go to 4 |
| b. Cilia surround open end of cup-shaped body. Individuals growing in colonies, attached by long strings | Colonial Ciliate |
| Back to the beginning | |
| 4. a. Trumpet-shaped body with longest cilia surrounding open end | Stentor |
| b. Oval body, cilia covering all parts | Paramecium |
| Back to the beginning | |
| 6. a. Flagella (whip-like structures) present | Dinoflagellates |
| b. Pseudopodia (fake feet) present | go to 8 |
| c. No appendages | go to 9 |
| Back to the beginning | |
| 8. a. Pseudopodia thin, straight, radiating from center | Radiolarian |
| b. Pseudopodia broad and blunt | Ameoba |
| Back to the beginning | |
| 9. a. Green in color with shell covering | go to 10 |
| b. Not green; long, flat, and rectangular (like a ruler) maybe one or many | Bacillaria |
| Back to the beginning | |
| 10. a. Round or square, usually in long chains of multiple organisms | Chain diatom |
| b. Oval shaped | Boat-shaped diatom |
| Back to the beginning | |
| 11. a. Organism is permanently attached | go to 12 |
| b. Organism is unattached and freely moving | go to 15 |
| 12. a. The organism is colonial | go to 13 |
| b. Not colonial | go to 14 |
| 13. a. Individuals protrude from sheath with tentacles for feeding | Hydroids |
| b. Lacy covering over hard surfaces, housing tiny animals ("moss-like") | Bryozoan |
| Back to the beginning | |
| 14. a. Shell is gray to ivory with several plates; shrimp-like animal inside | Adult barnacle |
| b. Black, lined shell with 2 sides | Mussel |
| Back to the beginning | |
| 15. a. Worms | go to 16 |
| b. Not a worm | go to 18 |
| 16. a. Body segmented and with many legs and two large probes (look like bunny ears) | Mud-whip worm |
| b. Body round, unsegmented, and without legs | Roundworm (Nematoda) |
| Back to the beginning | |
| 18. a. Jointed appendages (look like legs) | go to 19 |
| b. Lacking appendages or appendages not jointed | go to 20 |
| 19. a. Body shrimp-like and flattened laterally (side to side) | Amphipod |
| b. Body is shield-shaped, with 4 legs on either side, legs end in several hair-like structures, eye-spot present | Barnacle nauplius |
| c. Single eye; 2 jointed antennae, body segmented | Copeopod |
| Back to the beginning | |
| 20. a. Body is tear-drop shaped with foot at end. Head and mouth surrounded by cilia. | Rotifer |
| b. Slimy, elongated body with one or two pairs of tentacles at anterior end | Sea slug |
| Back to the beginning | |