Grade 8 Science Questions

**Remember that the lab write up for the science fair is due in class on Friday. **
Read section 2.1
1. Define in your own words
a. permeable
b. impermeable
c. selectively permeable
2. a.Explain what diffusion is and give three examples of where it can take place?
b. Diffision also takes place in cells. Explain what happens when the amount of CO2 is the same inside the cell as it is outside? When the amount inside is great, when the amount outside is greater.
c. What is osmosis? Page 42
3. Explain how limp carrots become firm again. Page 42
4. Explain what happens to materials such as glucose when water enters and exits the cell. In which direction does water tend to move in a cell?
5. Explain what carrier proteins are and what active transport is, page 46.