Q2 of 16 Page 11

What are porins? What role do they play in diffusion?

The porins are proteins that form huge pores in the outer membranes of the plastids, mitochondria and some bacteria. Function: It allows molecules up to the size of small proteins to pass through.

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1 What are the factors affecting the rate of 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.