Secondary 1/2 Level Preferred terms In Osmosis: we prefer the term “water potential” to “water concentration”. For xylem and phloem: we prefer the term vessel than tube. i.e xylem vessel. Active transport, osmosis and diffusion Diffusion Osmosis Active transport Down a concentration gradient ✓ ✓ ✗ Against a concentration gradient ✗ ✗ ✓ Energy needed … Read moreTransport Systems in Organisms
Any students taking Physics at O level will be able to tell you that there are two types of currents – a.c and d.c. But do they know why? Could we have just used d.c or a.c alone? Click here for a brief recount of what happened.