APPLICATION Photosynthesis is the process in which plants use energy from the sun, together with CO2 (carbon dioxide) and water, to make their own food and produce oxygen. Various factors affect the rate of photosynthesis, such as light intensity, light wavelength, CO2 concentration, and temperature. Below is a graph of how temperature relates to the rate of photosynthesis for a particular plant. (All other factors are assumed to be held constant.)

a. Describe the general shape of the graph. What does the shape of the graph mean in the context of photosynthesis?
b. Approximate the optimum temperature for photosynthesis in this plant and the corresponding rate of photosynthesis.
c. Temperature has to be kept within a certain range for photosynthesis to occur. If it gets too hot, then the enzymes in chlorophyll are killed and photosynthesis stops.
If the temperature is too cold, then the enzymes stop working. At approximately what temperatures is the rate of photosynthesis equal to zero?
d. Write a function in at least two forms that will produce this graph.

120 100 60 40 10 20 30 40 50 Temperature("C) When chlorophyil fades for the winter, leaves change color. When they appear red or purple, it is because glucose is trapped in the leaves and changes color when exposed to sunlight and cool nights.