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Potato Lab

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by

Daniel Bae

on 6 October 2014

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Transcript of Potato Lab

Materials
Ruler
Long knife
Potato
Short knife
Iodine solution (1ooml)
Watch glass
Timer
Paper towels


Safety
- Be careful when using knives
- Make sure the iodine doesn't contact with your body
Background
Data
Analysis
The data tells us that the bigger the volume of the cell is, it is less efficient. Cells need to send products and info all throughout the cell but if it is too big they cannot do it fast enough.

1. 0.125cm^3-> 100%
2.0.875cm^3-> 87.5%
3. 0.625cm^3-> 59.87%

They need cell division!
Cell Division Potato Lab
(Why do cells divide?)
-Albert Cho, Paul Lee, Daniel Bae-(9/29)



Procedure
1) A potato was peeled off.

2) A small knife was used to cut 3 pieces of potato into sides with 0.5, 1, 2 (cm)

3) A beaker was filled with iodine.
4) Starting from the smallest cube to the largest, each cubes of potatoes were dropped into iodine.

5) After 10 minutes the potato cubes were taken out in opposite order.

6) The experimental results were observed and recorded.
Research Question
How does the surface area to volume ratio of the potato affect the efficiency in which the iodine solution diffuses within the potato?

Hypothesis/Prediction
When potatoes are immersed in a iodine solution, the potatoes start to have a dark navy color. This change of color represents reaction between iodine and starch, which is a substance that potatoes contain.
Moreover, regardless of the potatoes having different volumes and surface areas, the rates of the distance of depth in which the iodine solution permeates within are the same.

If the volume of the potato affects the amount of time it takes to soak the entire potato, and if cubes of potatoes that each has sides that have lengths of 0.5cm, 1.0cm, 1.5cm, then the potato with sides of 1.5cm will take the longest to be completely drenched.
Abstract
Efficiency
of big/small cells?
Cells
- represented as potato cubes!
Three cubes of potatoes, having volumes of 0.125cm^3, 1cm^3, and 8 cm^3, were immersed in an iodine solution for 10 minutes. The cubes were then delved in half and observed.
--> The larger the volume of the potato is, the less the
iodine solution permeates in the potato
--> Materials (iodine) take more time to reach the
nucleus (center) if the cell (potato) has a large volume (SA:V ratio is small)
<The smaller potatoes took less time to be completely soaked --> High Efficiency

The iodine solution reached the same depth of each cube - 0.25cm.




Independent variable:
volume
Dependent variable:
spread of iodine
Experimental group:
potato cube with a side of 0.5cm and 2cm
Control group:

potato cube with a side of 1cm


Conclusion
- Fortunately, after performing the experiment with the cubes of potatoes, our experimental results were able to support the researchers' hypothesis. The researchers were able to conclude that the time it takes for the iodine solution to reach the center and the volume of the potato have a directly proportional relationship.

Moreover, the researchers were able to connect this conception with the division of the cells. We were able to establish an understanding of why the cells have a strong tendency to undergo division, which is in order to promote efficiency.
Further Study
If we were able to have more accurate measurements of the cube potatoes, we would have been able to have more accurate results.
Moreover, rather than merely attempting to prove the direct relationship between the time it take for the iodine solution to reach the center and the volume of the potato. Since we now have grasped an understanding of why cells divide, we are looking forward to learning specific processes of cell division.
http://oregonrural.org/2010/10/potato-harvest-season/
Full transcript