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Why do plants have leaves? Photosynthesis Light Energy + 6CO 2 + 6H 2 O ---> C 6 H 12 O 6 + 6O2 Plant Cell Chloroplast Why Do Plants Have Leaves? Stems have a lot of tissue volume that needs energy to support metabolic activities Stems have very little surface area Leaves add surface area but very little additional interior to support Cacti Succulent Plants Why Are Leaves Different Thickness? Sun leaves Shade leaves Stomata Stomata Stomata Adaptation for Protection From Ozone Why Do Some Leaves Have Trichome? Sycamore Leaf Phototropic Spectral Signature for Pine Needles 80% 60% 40% Spectral Signature for Pine Needles 100% Percent Reflectance Percent Reflectance 100% 80% 60% 40% 20% 0% 400 500 700 800 900 1000 Wavelength (nm) 20% 0% 400 600 500 600 700 800 Wavelength (nm) 900 1000 Light Electromagnetic Spectrum The ALTA Reflectance Spectrometer Remote Sensor Imaging 4 6 7 1 5 2 3 Post Lab Discussion…. Percent Reflectance Spectral Signature Mature & Young Leaves Young Leaf 100% 80% Mature Leaf 60% 40% 20% 0% 400 500 600 700 800 Wavelength (nm) 900 1000