What are the factors affecting the rate of diffusion?

2 What are porins? What role do they play in diffusion? 3 Describe the role played by protein pumps during active transport in plants. 4 Explain why pure water has the maximum water potential. 5 Differentiate between the following:  (a) Diffusion and Osmosis(b) Transpiration and Evaporation(c) Osmotic Pressure and Osmotic Potential(d) Imbibition and Diffusion(e) Apoplast and Symplast pathways of movement of water in plants.(f) Guttation and Transpiration.