Biology Forum › Cell Biology › Porous potatoes – Osmosis
February 8, 2009 at 8:41 am #10866cassiemhotmailcomParticipant
I was hoping someone would help me with this.
Okay so you have an experiment where you use potato cores with NaCl solutions of different concentraions ( 0%, 0.5%, 1%, 2%, 5%, 10%)
What is likely to happen to the potato cells and what occurred within the cell?
What would be the control measures for this experiment?
What is the variable?
What are two limitations related to this activity?
February 8, 2009 at 11:51 am #88887mcarParticipant
As far as I know, 0.9% NaCl is isotonic.
February 8, 2009 at 1:21 pm #88890JorgeLoboParticipant
give us your hypothesis and experimental design
February 11, 2009 at 4:50 pm #88988
i’ve done that experimet short time ago… when the potatoes cores are putted in that solutions it will loose or get water or doesn’t loose or gain water. So the objective of this experiment is to find the hydric potencial of the potato. When the concentration of the solution is lower than the potato, water gets out from the potatoe. when the concentation of the solution is higher, water get into the potato. when the concentrations are the same, it neither looses or gain water.
I don’t know how was your experiment but in mine, we controled the weight of the potatoes cores. If wheight increases so the potatoe has gained water, decreased when it looses water, and mantain if no water is traded.
Just a note to mcar: as far as i known 0.9% NaCl is isotonic to hemacies…not every tissues, and is not aplicable to the potatoe for example…
February 12, 2009 at 12:29 am #89001plasmodesmata11Participant
I think it may be described backwards above… If there is more solute in the solution than in the potato (hypertonic), water will move out of the potato, and if there is less solute in the solution than in the potato (hypotonic), water will move into the potato. I have done this with starch, glucose, and dialysis tubing before… 🙂
February 12, 2009 at 11:45 am #89016
yes… you’re right plasmodesmata 11. I always think about the movement of solutes and not the water…
Sorry my mistake
February 24, 2009 at 8:41 am #89306wintersongParticipant
i understand that water moves from the potatoe and into the high soloute concentration via osmosis, but is there any salt in the potatoe? if so does it move in or out via diffusion or facilitated diffusion?
February 25, 2009 at 1:32 pm #89336
Potatoes are not made exclusivety of water of course. Solutes moves via facilitated diffusion through chanels oriented by gradient of concentration.
February 14, 2013 at 3:20 am #113541SelinaParticipant
how would you explain osmosis with this experiement for 0%, 0.5%, 1%, 2%, 5% and 10% solutions (Nacl)?
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