Photosynthesis

Light Absorption Sun gives off visible light Red, Orange, Yellow, Green, Blue, Indigo, Violet Some colors reflected to our eyes Some colors absorbed into the object viewing

Choices: Red Orange Yellow Green Blue Indigo Violet Which color(s) are being reflected? Yellow Which color(s) are being absorbed? Red, Orange, Green, Blue, Indigo, Violet

Choices: Red Orange Yellow Green Blue Indigo Violet Which color(s) are being reflected? Blue Which color(s) are being absorbed? Red, Orange, Yellow, Green, Indigo, Violet

Choices: Red Orange Yellow Green Blue Indigo Violet Which color(s) are being reflected? None Which color(s) are being absorbed? All (Red, Orange, Yellow, Green, Blue, Indigo, Violet)

Choices: Red Orange Yellow Green Blue Indigo Violet Which color(s) are being reflected? All (Red, Orange, Yellow, Green, Blue, Indigo, Violet) Which color(s) are being absorbed? None (all colors are reflecting into our eyes)

Choices: Red Orange Yellow Green Blue Indigo Violet Which color(s) are being reflected? Green Which color(s) are being absorbed? Red, Orange, Yellow, Blue, Indigo. Violet

Light Absorption Green reflected Red, Orange, Yellow, Blue, Violet absorbed into the leaf With leaves, green light reflected (so we see green leaves) Reds and blues most used in photosynthesis

Photosynthesis Overview Defined: Production of sugar & oxygen from CO2, water, & sunlight Endergonic reaction: Reaction that requires energy (sunlight) Who: Autotrophs (Plants, algae, some bacteria) End Result: Sugar & oxygen waste

Stage 1: Light Dependent (Light Reactions) Where: Thylakoid membranes of chloroplast What happens? 1) Sunlight converted into ATP energy 2) Water atoms (H2O) broken apart Hydrogen (H2) kept for later use Oxygen (O) is released as a waste How: Sunlight causes electrons of chlorophyll to detach Free electrons causes ATP to bond End Result: ATP, H2, Oxygen waste

Stage 2: Light Independent (Dark Reaction) Where: Stroma (fluid interior) of chloroplast What happens? ATP (from light reaction) creates sugars How? ATP breaks apart CO2 + H2 Bunch of unstable C’s, O’s, and H’s recombine into C6H12O6 (Glucose) End result: Glucose created by all autotrophs C O O H H

Kobe Kuiz Which color(s) is/are absorbed by a typical red apple? Which color(s) is/are reflected by a typical red apple? What is used during the light dependent reactions? What created during the light dependent reactions? What is used during the light independent reactions? What created during the light independent reactions? True or False: Plants are the only photosynthetic organisms.