To find out which ingredient the cockroaches are refusing, you can carry out a controlled experiment. hydramethylnon is dissolve
d in oleic acid before being mixed with corn syrup to prepare the poisoned bait, so you should test all three ingredients. suppose you conducted a feeding trial to test each ingredient. in the trial, a set of four agar dishes, three containing all except one ingredient and one with all three ingredients (the control), were weighed and placed 3 cm apart on the kitchen floor in an infested apartment. after two days, the dishes were weighed again to measure food consumption. you then repeated the trial 4 times and averaged the results
<span>A) Roaches ate about the same amount from the dish with no hydramethylnon as they did from the control dish. B) Roaches ate about the same amount from the dish with no oleic acid as they did from the control dish. F) Roaches are refusing corn syrup.</span>
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<span>In this scenario (before pesticides were ever introduced to cockroaches) a certain subset of the population was genetically more likely to avoid oleic acid for whatever reason. Traits like this float throughout populations and contribute to genetic variance. When pesticides are introduced to the population, cockroaches with the previously neutral trait of oleic acid avoidance were now given a significant boost in regards to their relative fitness.</span>
The best explanation for the process of transpiration in plants is option A. It is the evaporation of water from leaf stomata, which helps in xylem transport. This evaporation of water in the leaves is released to the atmosphere as a vapor. A process called guttation occurs during transpiration wherein the water loss is in a form of liquid from the stem or leaf of the plant.
Transparency of water relates to the depth that light will penetrate water. The change that occurs is from predominantly yellow light at the surface to blue-green at depth in clear water or yellow-green in waters having a high concentration of dissolved organic material.
If we want to isolate a species or identify it, we should grow it in a plate with the appropriate media. In this way, it will be much easier to separate a single cell and analyze it by its morphology or study the colony growth.
Stab tubes can be used when we want to study, for example, how a bacteria might grow under low-oxygen conditions. Cells might be inoculated in a liquid media or semi-solid media. We might analyze their growth in the deeper parts of the tubes, where oxygen is very low.
Grow bacterias cultures in agar plates will also allow us to separate the species of interest form other species present in the culture. We might also compare and study differences between species growth.
When growing bacterias on growth plates, they do not last long, as they have more chances of dehydrating. Instead, if we want the culture to survive for a longer-term, we should use stab tubes.
Stab tubes are better to study the motility of different species, which might help us to identify certain bacterias of interest.
