5. Samples of Organism C were collected from a pond. One individual is shown as

Question

5. Samples of Organism C were collected from a pond. One individual is shown as it would appear under a light microscope, with the objective magnification used to view it indicated. Image D represents a sketch of Organism C from the pond water sample. The box around it represents a piece of 8.5 in x 11in (21.6 cm x 27.9 cm) paper. Calculate a distance to be represented by the scale bar, show all of your work, including the correct units. (Hint: To answer this question, think about what you know in terms of the dimensions of all of the items in the images, and how you can use this information to solve for what you do not know.)

Explanation / Answer

Considering the structure of the organism seen under 10x microscope and the sample obtained from pond, the organism must be Daphnia. Daphnia is a small aquatic crustacean which measures about 0.2 to 5mm in length. The organism is placed in the center of a paper with dimensions of 21.6 cm x 27.9 cm.

The scale under 10x microscope shows 5 regions in the scale across the length of the organism. The length of the organism is 5 mm. Therefore, each region or unit of the scale must represent 1 mm.  

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