Passage IV

The total magnification provided by a compound light microscope is determined by multiplying the power (magnification) of the ocular lens (eyepiece) by the power of the objective lens. The area seen when looking through a microscope is called the field of view (FOV). The diameter of the FOV varies with total magnification. Table 1 gives the power of, and the FOV diameter associated with, 4 different objective lenses on a microscope (Microscope M) with an ocular lens power of 10x. Table 2 lists 4 types of microscopic organisms found in pond water and gives their size ranges and their distinguishing characteristics.

21. Suppose a student using Microscope M with Objective Lens 2 to examine a drop of pond water found an organism that contained chlorophyll and was approximately the same size as the FOV diameter. Based on Tables 1 and 2, this organism would most likely be:

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

The stem of the question says that there is chlorophyll, look at table 2 first, so you should consider choosing Euglenas or Volvoxes;

The stem of the question says that Lens 2 is used, and lens 2 is listed in table 1 The FOV is 1.6, in line with volvoxes in size range