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

Prism

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 Choices: Red Orange Yellow Green Blue Indigo Violet

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

Photosynthesis 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

Where: Thylakoid membranes of chloroplast What happens? 1) Sunlight converted into ATP energy 2) Water (H 2 O) broken apart Hydrogen kept for later use; Oxygen is released as a waste End result: ATP, H 2, Oxygen Stage 1: Light Dependent (Light Reactions) H2H2 O ATP H2H2 O H2H2 O H2H2 O H2H2 O H2H2 O Thylakoid membrane

Stage 1: Light Dependent (Light Reactions) What is used during the light dependent stage? What is created during the light dependent stage?

Where: Stroma (fluid interior) of chloroplast What happens? –C–CO2 is taken in –A–ATP breaks apart CO 2 + H 2 –C–C’s, O’s, and H’s recombine into C 6 H 12 O 6 (Glucose) Stage 2: Light Independent (Dark Reaction) ATP ATP ATP H 2 H 2 H 2 H 2 H 2 H 2 CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 Stroma (fluid interior) ATP ATP ATP H HH HH H H HH H H H C C C C C C O O O O OO OO O O OO C 6 H 12 O 6

Stage 1: Light Independent (Dark Reactions) What is used during the light independent stage? What is created during the light independent stage?

Connection between photosynthesis & respiration Plants –Create glucose through photosynthesis –Glucose is used to make ATP through cellular respiration Animals –Animals eat plants to obtain their glucose –Glucose is used to make ATP during cellular respiration

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.