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!!!!!

10y4 Homework

Complete the questions on this link, then check your answers using the next page. Make sure you show your working for marks in the exam, but also so you can pick up any mistakes now. Bring these into class on Friday - http://www.gcse.com/waves/vfl.htm

10y4 Physics - Waves

1. Explain what 'refraction' means - http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html
2. What happens to waves during 'diffraction'? - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesrev5.shtml
3. What happens to diffraction when the gap the waves travel through is smaller? - http://www.launc.tased.edu.au/online/sciences/physics/diffrac.html
4. What is diffraction important for? - http://www.launc.tased.edu.au/online/sciences/physics/diffrac.html
5. Try the activity and quiz on this link, writing down the relationship between wavelength and frequency - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesact.shtml
6. What range of frequencies can humans hear? - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/soundandlightrev1.shtml
7. What would be different when an insturment makes a low pitch sound compared to a high pitched one? - http://www.physicsclassroom.com/class/sound/u11l1c.cfm
8. What is the formula for working out the speed of a wave? - http://www.physicsclassroom.com/class/waves/u10l2e.cfm
9. Explain this picture using the words 'refraction' and 'wavelength'.

1. Watch this video (it continues in more 10 minute sections on youtube).  Write a written explanation about how soundwaves help Ben see things using the terms particles, reflection and amplitude.