Biology O Level 5090 Notes Better Page

Having better notes means nothing if you don't use them correctly. Spaced repetition is your weapon.

Weekly Cycle (2 hours per day):

| Process | Definition | Direction | Energy? | Example | |---------|------------|-----------|---------|---------| | Diffusion | Net movement of molecules from high → low concentration | Down gradient | No | O₂ into blood | | Osmosis | Net movement of water molecules across a partially permeable membrane from high water potential → low water potential | Down water potential gradient | No | Water into root hair | | Active transport | Movement of molecules against concentration gradient | Up gradient | Yes (ATP) | Mineral ions into roots; glucose into kidney tubules | biology o level 5090 notes better