after reading this lab report please do the following: 1. calculate the mean gro

ID: 98992 • Letter: A

Question

after reading this lab report please do the following:

1. calculate the mean growth of for each week for each amount of medium and plot the information on a data graph

2. determine if the syudent's hypothesis has been suppoterd or falsified.

3. disscus why the student had these particular results.

abstract

Flour Beetles, or “bran bugs,” only grow to approximately 1/8 of an inch long. Their bodies are flat and elongated and are a shiny reddish-brown in color. While they do have the ability to chew, they do not sting or bite (Asshoff and Roth, 2011). We obtained 3 glass vials. In one vial, we added 2 grams of whole wheat flour and 4 beetles. In the second vial, we added 6 grams of whole wheat flour with 5 beetles. In the last vial, we added 15 grams of whole wheat flour and five beetles. All vials were stoppered with cotton and were placed in an incubator at a constant temperature in complete darkness by the professor. If the amount of food resources is less than ideal, then the population of the flour beetles will also decrease because of the lack of available material needed to survive. Beetles were observed through the semester.

On the first day of the semester, May 15, three glass vials were obtained. In one vial, we added 2 grams of whole wheat flour and 4 beetles. In the second vial, we added 6 grams of whole wheat flour with 5 beetles. In the last vial, we added 15 grams of whole wheat flour and five beetles. All vials were stoppered with cotton and were placed in an incubator at a constant temperature in complete darkness by the professor.

On the second week, May 22, all 5 beetles in the 15g vial completely disappeared even though it was stoppered with 2 cottons! Hence, no further observations were noticed in this vial. In addition, no particular change in the beetles’ number, growth, reproduction, or behavior were noticed in the other 2 vials, 2g and 6g vials, until the 6th week, June 19. Every other week adults and larvae were counted.

Results.

2 g vial

the 6g vial

the 15g vial

week date adults 1 5/15 4 2 5/22 4 4 6/5 4 6 6/19 4 and 20+larvae 8 7/2 4 adults and 40+larvae 9 7/10 4 adults and 50+ larvae

Explanation / Answer

1. To calculate mean growth per week we use following formual:

(Ending numbers of bugs- starting numbers of bugs) / starting numbers of bugs

Therefore, the mean growth would be for 2g vial

Numbers

numbers of bugs

mean growth

4-4/4=0

4-4/4 =0

4 and 20+larvae

24-4 /4 = 5 bugs per 2 week

4 adults and 40+larvae

44-24/24 =0.83 bug per 2 week

4 adults and 50+ larvae

54-44/ 44=0.27 bug per 2 week

The time frame for 4, 6, 8 and 9 is two week. Therefore, there growth will also count in 2 weeks. Now to calculate per week calculations divide them by 2.

Now we can calculate mean growth for every vial easily.

2. The results supported that under control condition of air, bugs need a definite amount of food, more than that causes less growth and even death.

3. Those results occur because of two reasons- one is the cotton stoppers causes no passing of gases and the second is wheat flour also deoxygenate. Therefore, the environment inside vials becomes non-affordable for bugs, due to the increase of carbon dioxide. The bugs would not live through improper ventilation.