Diffusion and Osmosis Teacher Version.pptx

A lesson on the key points of osmosis and diffusion, including a practical for osmosis (RP3 AQA)

1. Transport Systems LO: Describe the process of diffusion Diffusion, Concentration gradient, Rate, Water Potential, Active transport, Mitosis, Chromosomes. Anagram Answer Definition Nooncentratic Noidffusi Tedilu Dirgaent Srhcoomoem Lunsoblei Ssimoit Bramemne Soosmis Meerablep Eurp Blusole Diturg

2. Transport Systems LO: Describe the process of diffusion Diffusion, Concentration gradient, Rate, Water Potential, Active transport, Mitosis, Chromosomes. Which dye was used to colour onion slides under the microscope? What is the portion of the cell that contains DNA in eukaryotic cells? How is DNA held in prokaryotic cells? What is the function of mitochondria in the cells? Why do eukaryotes all have mitochondria?

3. Transport Systems LO: To explain the process of diffusion. Diffusion, Concentration gradient, Rate, Water Potential, Active transport, Mitosis, Chromosomes. Describe what you see happening here. Use the term ‘particles’ and ‘movement’.

4. Diffusion: The net movement of particles down a concentration gradient , from an area of high concentration to an area of low concentration. This continues until all the particles are at equilibrium . Transport Systems LO: Describe the process of diffusion Diffusion, Concentration gradient, Rate, Water Potential, Active transport, Mitosis, Chromosomes.

5. Diffusion: Diffusion occurs in cells, whereby glucose and oxygen diffuse into the cells that require them (there is a lower concentration inside the cells). During respiration, carbon dioxide diffuse out of cells (lower concentration outside of the cell). 1: Explain what diffusion is using the example of spraying deodorant. 2: At what point does diffusion stop? 3: Where does diffusion occur in the body? 4: What factors might affect the rate of diffusion?

6. 4: What factors might affect the rate of diffusion? https://vimeo.com/157061873 -Distance of travel  How far the particles have to move to achieve equilibrium. -Increase the concentration gradient  A higher gradient means particles move quicker. -Increasing surface area  Increases the space for diffusion to occur, increasing the rate.

7. I pour water into a flower pot. What happens to the water level initially? What happens to the water level after 1 day? Diffusion, Concentration gradient, Rate, Water Potential, Active transport, Mitosis, Chromosomes.

8. https://www.youtube.com/watch?v=sdiJtDRJQEc Watch the video and create your own definition for osmosis. Explain how this is different to diffusion. Osmosis is the net movement of water molecules down a concentration gradient from a higher to a lower concentration, through a partially permeable membrane. The concentration of water molecules is known as water potential. The higher the potential, the higher the water concentration.

9. If you are floating on a life-raft in the ocean, why should you not drink the seawater? Write down your initial ideas to this question . https://www.youtube.com/watch?v=9ylt69-QwcA Now use the video to create an extended answer. Use as many of these words as possible: Osmoregulation, Isotonic, Salinity,

10. If you are floating on a life-raft in the ocean, why should you not drink the seawater? Sea water has a higher salinity levels than the cells in your body. Therefore, osmosis will occur in which water will travel from your cells into your bloodstream until it becomes isotonic (has the same salinity level inside and outside your cells resulting in no net movement of water). This in turn will have dehydrated your body further. https://www.youtube.com/watch?v=9ylt69-QwcA Now use the video to create an extended answer. Use as many of these words as possible: Osmoregulation, Isotonic, Salinity, Burst.

11. -Label 3 test tubes with the three concentrations of solutions. -Trim 3 potato cylinders to 50mm in length. -Weigh and measure the length of each cylinder, writing the results into the table. -Use a paper towel to wipe off excess moisture and place it in the relevant test tube. -In each test tube add 15cm 3 of the relevant solution. -Place at the back with your initials on it. -This will be reweighed tomorrow. Equipment list: Test tube rack 3 test tubes 3 potato cylinders White tile Knife Ruler Measuring cylinder Marker pen

12. Design a quick question that we could use next lesson to recap on today’s learning. . How could you prioritise the fact’s from today’s lesson. Judge what has been your best piece of work in this topic so far and explain why you have chosen it. Which career might you use the scientific knowledge from this topic? Explain why. Complete the following in green pen. Nina Tandon CEO of Epibone, a company using stem cells to regenerate bone defects. Summary Choices