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  • Volume And Water Potential Of The Blood
    4,176 words
    Gas Exchange 3.1 Surface area to volume ratio Exchange of gases occurs by diffusion at surface Whereas Production of wastes and use of resources occurs in the volume Therefore, as organisms increase in size they have proportionately less surface area compared to volume Adaptations flat, thin, ribbed bodies increase exchange surfaces 3.2 As organisms get larger they must have exchange surfaces within them all are moist, thin permeable, large surface area Plants Spongy / Palisade Mesophyll Air dir...
  • Water Potential Within The Cell
    665 words
    1. a) Bulk movement is the overall movement of a fluid. The molecules all move in the same direction. Diffusion however is the random movement of molecules which usually results in a fairly even distribution. In other words the movement is not guaranteed to move in one direction but the probability that it will move in the lower gradient is greater. Osmosis is similar to diffusion but is differentiated by the membrane's behavior. The cell membrane does allow water to move from higher to lower co...
  • Hard Water Residue
    1,359 words
    The purpose of this experiment is to explore the hardness of the water on campus. Hard water has been a problem for hundreds of years. One of the earliest references to the hardness or softness of water is in Hippocrates discourse on water quality in Fifth century B.C. Hard water causes many problems in both in the household and in the industrial world. One of the largest problems with hard water is that it tends to leave a residue when it evaporates. Aside from being aesthetically unpleasing to...
  • Potatoes Cylinders In Higher Water Concentrations
    2,908 words
    Aim: The aim of this experiment is to investigate the movement of water into and out of plant cells by osmosis. The cells chosen for study will be taken from potato tubes as they provide a ready supply of homogeneous material. I did the investigation in two parts, the first part of my investigation was my preliminary investigation and then I did my official investigation. In both of my investigations there are several similarities, such as fair testing, variables, key variables, reliability of e...
  • Ammonia Concentration In The Big Crayfish Water
    536 words
    Ammonia Excretion As A Function Of Body Size In Crayfish INTRODUCTION The breakdown of proteins and nucleic acids during metabolism gives rise to excess nitrogen which must be rid of by living organisms. Aquatic animals, such as the crayfish we studied in lab, the excess nitrogen is excreted in the form of ammonia (NH 3) Because ammonia is highly soluble in water, the ammonia is able to be excreted across the gills into the water. The rate at which this takes place is related to body mass of the...
  • 10 Cm 3 Of A Concentrated Solution
    442 words
    Biology coursework Investigation of osmosis in potato tissue AIM. To investigate the effects that occur by osmosis on potato tissue Hypothesis I believe that the higher the concentration of sugar solution, the mass of the potato decreases yet I believe that after 0.4 the mass decreases. Scientific knowledge A biochemical process in living cells, that occurs with the movement of water. It can be deemed as the movement of water from a high concentration to a lower concentration, the diffusion down...
  • Potato Cells Gain Water
    939 words
    Glucose Concentrations On Osmosis Glucose Concentrations On Osmosis Essay, Research Paper Studying the Effect of Various Glucose Concentrations on Osmosis in a Potato Osmosis is the process in which water particles move from an area of high water concentration to an area of low water concentration through a semi-permeable membrane until the concentrations are equal. Osmosis has the same basic theory as diffusion. Particles are moving from an area where they are in great concentration to an area ...

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