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PhotoSynthesis. Photosynthesis When you and me eat, we find our food. ... They make
their food and energy through a process called photosynthesis. ...
rate of photosynthesis. The ... carriers. The rate of photosynthesis will always
correspond to that factor which is in least supply. ...
rate of photosynthesis. The ... carriers. The rate of photosynthesis will always
correspond to that factor which is in least supply. ...
Photosynthesis. ... Photosynthesis To obtain energy needed for life, organisms depend
on the processes of cellular respiration and photosynthesis. ...
Process of Photosynthesis. Process of Photosynthesis ... Photosynthesis provides the
basic energy source for virtually all organisms. An extremely important ...
Submitted by kingkhan on March 30, 2006
Category: Science
Words: 2301 | Pages: 10
Views: 160
Popularity Rank: 71,616
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Osmosis investigation
Aim: To investigate how sugar concentration affects the mass or size of a potato and find out the sugar solution.
Introduction: Osmosis is the movement of water molecules across a partially permeable membrane form a region of high water concentration to a region of low water concentration until the concentration on both sides is equal. This means that osmosis is like diffusion involving water molecules. Osmosis occurs across a partially permeable membrane, with holes only small enough for water molecules to pass through and not larger ones like glucose. An example of a partially permeable membrane is visking tubing. Osmosis happens so that the concentration outside the membrane is equal to the concentration inside the membrane. This means that there will be a steady net flow into the stronger solution, (of glucose) causing this region to fill with water and dilute it. This is how the concentration is balanced. Higher water concentration means a more dilute solution; because water makes up a high proportion of the molecules present, conversely lower water concentration means a more concentrated solution.
Osmosis is important for organisms because this is how water is transported into and out of cells. The osmosis that takes place in plant cells when surrounded by a weak solution makes the cells swell up and become turgid. This is useful for the plant as it gives support for opening stomata guard cell. Leaves are entirely supported by the turgor pressure that is created when a plant is well watered and all the contents of the cells start to push against the cell wall and thereby giving support to the plant tissue. This is important as it makes green parts of the plant "stand up" into the sunlight.
In the diagram below the water has passed into the cell, into the strong solution by osmosis. In the other cell water has passed out of the cell into the strong solution by osmosis.
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