Hartismere School

Pro- and Eukaryotic cells, Specialised animal and plant cells, Intracellular transport diffusion, osmosis, active transport. Substances more from low to higher concentration up a concentration gradient.

Additional Science 1

In theory, the level of solution two will rise, but this will be opposed by gravity and will be dependent on the width of the container. For example, red blood cells could: They do not have a cell wall, so will change size and shape when put into solutions that are at a different concentration to the cell contents.

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But larger molecules like sugar cannot pass through the membrane. Syllabus File. By doing this, water moves down the concentration gradient.

Log in Sign up. Quizlet URL. Animal cells also take in and lose water by osmosis.

What is the difference between diffusion, osmosis and active transport? MyTutor

Once again, this is a passive process and no energy is required. Cell biology. In pure water, the cell contents the cytoplasm and vacuole push against the cell wall and the cell becomes turgid. Practical Guide 1: Plants and photsynthesis URL.

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What is the difference between diffusion, osmosis and active transport?

These are the sources and citations used to research Osmosis in potatoes. Recommended as a whole class activity, rather than for individual students. Topic 7: Join Us! Get one-to-one help from a personally interviewed subject specialist. Additional Science 2. Often, substances have to be moved from a low to a high concentration - against a concentration gradient.

These resources can be used in the delivery of lessons on transport diffusion, osmosis and active transport at KS4. Fri 26 Mar A selectively permeable membrane allows some small substances to pass through but prevents larger substances doing the same. The animation can again be used to introduce or to summarise the process.

Plants would be exposed to higher concentrations of solutes if there was less water in the soil - for instance, if plants were not watered, or plants in drought conditions.

Active transport then occurs across the root so that the plant takes in the ions it needs from the soil around it. Home Episodes Clips. The aim is to investigate the effects of osmosis on a single cell.

This resource is best used by selecting one or two of these experiments to run in class as an example of diffusion in action. Diffusion experiment A worksheet with an experiment on diffusion. The activity would be best used as a consolidation or HSW exercise after teaching the theory of this topic.