Final Crunch : November 09, 2008

Final Crunch
Image Data
File Name: 20D_67208
Model: Canon EOS 20D
Lens: Canon EF 100mm F/2.8 USM Macro
Date: 11.09.08 3:32am
Focal Length: 100mm (160mm)
Shutter: 1/2 s
F-Stop: F5.6
ISO: 200
Ex Bias: -2/3
Program: Aperture priority
Metering Mode: Evaluative
Flash: Off
Focus Mode: Manual focus

Final Crunch

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Deciduous plants are believed to shed their leaves in autumn primarily because the high costs involved in their maintenance would outweigh the benefits from photosynthesis during the winter period of low light availability and cold temperatures. However, there is no reason why leaf fall should necessarily be preceded by the production of vivid autumn colors, and the function of the color change is still uncertain. Autumn colors (especially red) are not just due to the breakdown of chlorophyll; in fact anthocyanins (red-purple) are actively produced in autumn. What use is the production of pigments in leaves that are about to fall? A number of hypotheses have been proposed, including photoprotection, coevolution and allelopathy.

Comments (0)

Brad   11.13.08 7:33am  
Wow.... this is how you are good at taking photos.... and I still have a lot to learn! Great photo.

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