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Laboratory Report 4: Invertebrate Animals

Section: I

Table: 6

Date: September 26th, 2013 Introduction:

In our group, our task was to observe the selected four invertebrates and familiarize ourselves with their taxonomic levels through the organism’s mechanisms of feeding, motility, and reproduction. Our group used the prior knowledge we possessed about the Hydra, Rotifer, Gammarus, and Planaria organisms to complete the lab. We knew that all of these small invertebrates have a freshwater habitat. Each organism differs in taxonomic levels from Genus to Species. We knew that the Hydra reproduces with one of two methods: 1) by “budding” which is an asexual method of reproduction and 2) by reproducing through a sexual sperm and egg process. We also knew that the Rotifer was a round worm with a split tail. We had to find the “jaws” of the invertebrate, in other words, a transparent, clear mastox that intakes food. Additionally, our group knew that the Gammarus possesses a heart, an exoskeleton, and a digestive tract (outlined in yellow). Lastly, we knew that the Planaria is a flat worm that reproduces sexually and has an “ocelli” which responds to light.

Methods:

1. Set up the lap table with four microscopes all with the magnification at 40x.
2. Gather three flat slides, one depression slide and four slip covers.
3. Using a pipette, take a sample of Planaria and place the sample on one of the flat slides.
4. Take a slip cover and place it over the sample just placed on the flat slide. Repeat two more times with the sample of Gammarus and Rotifer.
5. Using a pipette, take a sample of Hydra and place it on the depression slide.
6. Place a slip cover over the sample of Hydra.
7. Carefully observe the four individual samples under the basic magnification.
8. Gradually move up in magnification level if a closer look at the sample is needed.
9. Draw and label what can be seen under the microscope onto the laboratory sketch pages. Repeat

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