View
218
Download
1
Tags:
Embed Size (px)
Citation preview
Floral Careers Plant Propagation
Light & Photosynthesis
The Electromagnetic Spectrum
Colors of Light that Plants Use
• Plants absorb red light.• Plants absorb blue light.• Plants don’t absorb green light, they
reflect green light.
Sources of Light
• Sun• Artificial Lights
• Incandescent bulbs• Fluorescent bulbs• Specialized lights for plant growth
HID Lights in the Kirkwood Greenhouse
Where in Plants is Light Being Absorbed?
• Leaves.• Sometimes by the stems.• Specifically light is absorbed by a
chemical compound called chlorophyll.
Chlorophyll
• A green-colored chemical pigment found in the chloroplasts of plant cells.
Leaf Cross-sectional View Showing Plant Cells with Chloroplasts
Does This Plant Have Chlorophyll?
YES!
• Chlorophyll is still present in the leaves.
• It’s presence is masked by the more dominant red and purple pigments.
Autotrophs
• Living organisms capable of manufacturing their own food.
• Plants are autotrophs.
Photosynthesis
• Inputs:• Light• Water• Carbon dioxide• Chlorophyll
Photosynthesis
• Outputs• Oxygen• Sugar (glucose) = Food • See, plants really are autotrophs!
Paul’s Circle of Life
The End