If a cell has a diameter of 10 micrometers, approximately how many would fit across the field diamet

Hey brood910,

1. Well, what's the field of view at low-power and similarly at high-power objective? Let's say that the low power field of view you're using is approximately 2.5 millimeters. Convert 2.5 mm in um (micrometers): 2.5 * 10-6 um. Then divide 2.5 * 10-6 um by 10. This number should give you the number of cells that would fit in the field of view at low-power, but remember, this is dependent on your field of view. If you don't know how to get the field of view:

1. Place a clear plastic ruler on the stage.
 
2. Using the coarse-adjustment knob, focus on the ruler. Position the ruler so that one of the millimetre markings is at the left edge of the field of view.
 
3. Measure and record the diameter of the field of view in millimetres (mm) for the low-power objective.
 
4. Using the following formula to calculate the field of view for the medium-power objective

Medium-power     Low-power           Magnification of low-power objective     
field of view    =  field of view   x   Magnification of medium-power objective

For example, if the low-power objective is 4x with a field of view of 2mm, and the medium-power objective is 10x, then:

Medium-power field of view =  2 mm x 4/10
                                         = 2 mm x 0.4
                                         = 0.8 mm

Similarly, calculate the field of view for the high-power objective and record the value.

2. In ordinary life, a fruit is the edible part of a plant developed from a flower and containing one or more seeds with any accessory tissues, as the peach, mulberry, or banana. Biologically speaking, a fruit is the developed ovary of a seed plant with its contents and accessory parts, as the pea pod, nut, tomato, or pineapple.

3. The botanical definition for "fruit" is: the flowering ovary of a plant that contains seeds. A lot of botanical fruits aren't even edible.

The term "vegetable" isn't used by botanists. A botanist couldn't classify a tomato as a vegetable even if they wanted to.... the word is not part of their nomenclature. Most of the plants we consider to be vegetables are called "herbaceous plants" in botany.

Make sense?

Bio_man, for three you're incorrect because botanically, a tomato is a fruit: the ovary, together with its seeds, of a flowering plant. However, the tomato is not as sweet as most foods eaten as fruit, and is typically served as part of a salad or main course of a meal, rather than at dessert. It is therefore considered a vegetable for most culinary purposes. One exception is that tomatoes are treated as a fruit in home canning practices: they are acidic enough to be processed in a water bath rather than a pressure cooker as "vegetables" require. Tomatoes are not the only foodstuff with this ambiguity: eggplants, cucumbers, and squashes of all kinds (such as zucchini and pumpkins) are all botanically fruits, yet cooked as vegetables.