Osmosis prac write-up

Today we will be completing some work from last lesson on th osmosis practical we did.  In a word document, include information under the following headings:
Aim:
Briefly explain what we wanted to investigate in this test.
Materials and Methods:
Use this link to jog your memory, but don't wory too much about the small details as we are focusing more on the discussion and conclusion.
Results:
briefly explain what we observed during the practical, using the table from page 3 if you don't have a complete set of results.
Discussion:

• Explain the overall pattern in the results we collected, making note of any anomalies.  What might have caused these?
• Use the graph on page 4 of the report to estimate at what salt % the potato would have stayed the same weight. What does this mean about the concentration of salt inside the potato?
• If there was no change in mas, does tht mean no water at all was moving in either direction? Use the term 'dynamic equilibrium' in your answer.

Once you've finished and saved/printed your work, try this activity to do with mitosis . There is also some information here which might be helpful.
There are also some activities here relating to mitosis in the brain and a game based on mitosis.

Osmosis

Today we're going to start looking at osmosis, the next topic after diffusion.  Answer the following in your books:

1. Explain how diffusion works using the phrase 'concentration gradient'.
2. In osmosis, what particles are moving across the membrane?
3. How does water get into plant root cells?
4. Use the animation here (click on diffusion/osmosis, then play through). What is the 'aim' of both diffusion and osmosis?
5. Explain what isotonic, hypertonic and hypotopnic solutions are.  What can happen to cells bathed in hypertonic solutions?
6. What is turgor pressure? What can happen to a cell if turgor pressure is too high?
7. Explain how this celery is able to stand upwards. What conditions must occur for the water to move up through the cells of the plant?


8. If water is moving up through the plant, is the process diffusion or osmosis?



If the orange circles are solute and the smaller circles are water particles, in which direction will there be a net movement of water?

10. Define solute and solvent:
11. Play this game - if it doesn't woprk at school try it at home as it illustrates stuff we're talking about really well!
12. Extension - Apart from within organisms as part of Biology, where else can osmosis be useful?
13. Homework - This link won't work at school, but using it at home should run a java program about diffusion and osmosis. Try it out, and if it works name two situations where osmosis occurs in Biology. Even if the program doesn't work, researching this on the internet will work fine and will get you an achievement point if you bring it in next week.  

Diffusion

Today wereing to be looking at diffusion.  You are going to create a powerpoint  covering the following points.

• Explain what diffusion is. This could be the definition from last lesson or another one you find on the internet.
• Show how it occurs, there are lots of good images and animations about this.
• Explain situations where it occurs in cells.  Try and give at least two examples.
• Explain why it is important to cells living and carrying  out various purposes.
• Extension - What is the difference between diffusion and osmosis? Give some definitions and examples.

You're going to use the internet to find your own resources, but here are some websites that might be helpful -

• http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/cells/
• http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html
• http://www.biologycorner.com/bio1/diffusion.html
• http://www.sciencemadesimple.co.uk/page88g.html
• http://www.emc.maricopa.edu/faculty/farabee/biobk/biobooktransp.html#Cells

Cells

Today we will be looking at Cells for the start of the year 11 course. Answer the following in your books -

1. What are organelles?
2. Use this interactive link to describe the function of mitochondria and chloroplasts.
3. What is the function of the Golgi body?
4. Use this interactive site to find out the size of a ribosome, a mitochondrion and an egg cell.  How many micrometres are there in a metre? What is the size of the smallest thing in the diagram?
5. List two differences between plant and animal cells:
6. What are vacuoles? Why are they important for plant cells? 
7. Where did organelles originate from?
8. Watch this video, and then briefly descirbe the job of the rough E.R. and ribosomes:
9. How many cells are there in an average human body?
10. Use the activity on this link to describe what diffusion is:
11. Try this quiz on cells -

Chemistry Revision

Today we will be doing two things - you can use this bitesize link to revise sections from the Chemistry course and use the tests to check your understanding, or you can have a go at past paper questions from Mr. Lawrence's blog here . Make sure you let me know if there is anything you aren't sure about.

Revision

Today we will be revising different sections of the Biology, Physics and Chemistry courses. Use this link - http://cheneygcsescience.blogspot.co.uk/ to find the samples questions papers and answers. You could try answering them or making notes, or using old posts from here to revise things you've identified that you need to improve.

I'm sure some of you have found thsi already, but this website has some good revision notes. Everyone should also make sure they get a revision guide form the school shop for one pound! This is your homework if you haven't got one already.
Finally, there are going to be weekend revision sessions starting this weekend on Saturday from 10 - 2 with breaks for food, check your parentmail for details.  Well worth showing up for a couple of hours!!!!!