saline solution was added into the baggie‚ it was discovered that a small portion of the saline solution would leave the bag. In the baggie that has 0.2 percent concentration of sucrose‚ it’s initial mass was 20.18 grams‚ after spending a night‚ in a beaker of water‚ a small portion of the 0.2 percent concentration of sucrose escaped‚ and the final mass decreased to 18.73 grams. There was a 7.19 percent decrease
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mass before and after. Due to osmosis the potato cores will change in mass to make the concentrations at an isotonic level‚ helping us to work out the mass of the potato. I predict that potato in the weaker solutions will gain mass‚ because some water will be absorbed by the potato to make the concentrations isotonic. Similarly‚ I think the potato in the stronger solutions will lose mass as they will have to lose water to dilute the stronger solution. Osmosis: Osmosis is the diffusion of water across
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Biology 107 Section 1 11/4/13 Diffusion & Osmosis Introduction The purpose in this experiment was to estimate the osmolarity of potato tuber and celery cells by change of weight.Pieces of potato tuber and celery would be incubated in different sucrose solutions to find out the molarity at which weight of potato and celery tissues do not change. My hypothesis was that the Table 1: Group Data for Experiment:Estimating Osmolarity by Change in Weight Table
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DETERMINATION OF THE WATER POTENTIAL OF POTATO TUBER CELLS. Method. Five sucrose solutions with varying molarity and one control containing distilled water were prepared and poured into test tubes. The potato discs were dried‚ weighed and added to the test tubes. The discs were then weighed again after a period of 24 hours. The percentage change in mass was then calculated. Apparatus.  Specimen tubes with stoppers x6  1cm3 diameter cork borer  razor
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AP BIOLOGY CELL UNIT ACTIVITY #5 NAME_____________________ DATE___________HOUR_____ CELL TRANSPORT MEMBRANE PROPERTIES PASSIVE TRANSPORT CHARACTERISTICS: DIFFUSION: Cell Unit Activity #5 page 1 OSMOSIS : ISOTONIC ANIMAL CELLS Cell Unit Activity #5 page 2 HYPOTONIC HYPERTONIC PLANT CELLS OSMOREGULATION – ADAPTATIONS Paramecium Fresh Water Bony Fish FACILITATED D IFFUSION: Cell Unit Activity #5 page 3 Marine Bony Fish ACTIVE TRANSPORT CHARACTERISTICS:
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unless they are dissolved in water. 3 Define osmosis (Supp. only) Osmosis the diffusion of water molecules from a region of their higher concentration (dilute solution) to a region of their lower concentration (concentrated solution)‚ through a partially permeable membrane. 4 Describe the importance of osmosis in the uptake of water by plants‚ and its effects on plant and animal tissues. The importance of osmosis Plants gain water through osmosis in their roots from the soil. Without a water
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Abstract I found that this experiment gives me an understanding on how osmosis and diffusion works. In its simplicity‚ it explains the process that our bodies (mainly cells) use all the time. It also showed me that even with the temperature changing‚ it doesn’t drastically change the rate of diffusion. Introduction Diffusion is important in all living systems. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water
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labelled three test tubes A‚ B‚ C‚ D and added initials of people in our group. 2. Used a syringe or graduated pipette to put 20 cm3water in tube A and 10 cm3 in tube B. 3. Put 20 cm3 of 17% solution in tube C and 10 cm3 in tube B; put 20 cm3 pure sucrose solutions in tube D. 4. Working on the dissecting board I cut the ends off large potato. I was careful with the knife and cut it onto the dissecting board away from myself. 5. Used a cork borer to obtain 4 cylinder of potato tissue and pushed
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Investigating the Water Potential of a Potato. I have been asked to investigate the water potential of a potato. During my investigation I will not actually be able to measure a value for‚ as it is a pressure value (kPa). Osmosis is a special form of diffusion involving only water molecules. It is defined as "The passage of water from a region of high water potential to a region of low water potential through a partially permeable membrane" Definition of Water Potential. The potential for water
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merely move in and out of unicellular organisms by diffusion‚ osmosis or active transport due to direct contact with their surroundings. However‚ not all the cells in multi-cellular organisms are in contact with the external environment for rapid exchange of substances between the internal and external environment. Thus‚ specialized transport systems are utilized. The substances travel along vessels to where they are needed. However‚ osmosis‚ diffusion and active transport remain the key procedures employed
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