Gr. 8 students learned last day about passive transport (no energy used by cells to get substances they need). We looked at diffusion of air particles (strong perfume) and methylene blue dye in water. To demonstrate diffusion in a plant cell, we looked at onion osmosis - how high concentration of salt outside of cell enters cell (low concentration) through permeable cell membrane. No energy was used by cell.
Today, students learned how cells use energy in active transport. Carrier proteins in the cell wall capture required substances (ie: glucose or sygar) and release the sugar inside of cell. Energy is used by cell.
Worksheet pg. 161 is due Wednesday, Nov. 12. Students can use notes and SciencePower8 pg. 47 to answer worksheet.
R.Doll