(a) Biological processes in plants are affected by environmental factors. The graphs each show the effect of changing one environmental factor on a biological process. The labels on the axes for each graph have been replaced with the letters P, Q, R and S. [Figure 5.0 showing two graphs: one showing an upward curve then plateau (P vs Q), another showing a downward slope (R vs S)] Identify the correct axis label for each of P, Q, R and S. Select from the following possible labels. temperature light intensity carbon dioxide concentration rate of photosynthesis rate of transpiration air humidity P ..................................................... Q ..................................................... R ..................................................... S ..................................................... [4] (b) Describe the process of transpiration in the leaf of a plant. [3]

1. (a)Identify the correct axis label for each of P, Q, R and S. Select from the following possible labels. temperature light intensity carbon dioxide concentration rate of photosynthesis rate of transpiration air humidity P ..................................................... Q ..................................................... R ..................................................... S .....................................................[4]
2. (b)Describe the process of transpiration in the leaf of a plant.[3]

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