BIEB174_Ch6&7ReviewQs

BIEB174_Ch6&7ReviewQs - Amanda Ta PID#A09103599 October...

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Amanda Ta , PID #A09103599 October 18th, 2010 BIEB 174 Section, Monday 12 pm Chapters 6 & 7 Review Questions Chapter 6, page 149 1. What controls the partitioning of carbon between growth and respiration? Explain why the efficiency of converting sugars into new biomass is relatively constant. The effects of environmental stress on maintenance respiration control the partitioning of carbon between growth and respiration. For example, maintenance respiration increases as temperature increases due to the rapid turnover of lipid membranes at higher temperatures. These effects on maintenance respiration are the major sources of variability in the efficiency off conversion of GPP, photosynthesis and its carbon-containing sugar products, and NPP, the new biomass produced by plants. The efficiency of converting sugars into new biomass is relatively constant because NPP is a constant fraction (40-52%) of GPP suggesting GPP and NPP are controlled by the same factors. 6. How does allocation to roots vs. shoots respond to shade, nutrients, CO2, grazing, or water?
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