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Light Absorption
• Sun gives off visible light
– Red, Orange, Yellow, Green, Blue, Indigo, Violet
• We see reflected light
– Red objects = reflect red light
– Blue objects = reflect blue light
Prism
Which color(s) are being reflected?
Yellow
Which color(s) are being absorbed?
Red, Orange, Green, Blue, Indigo, Violet
Which color(s) are being reflected?
Blue
Which color(s) are being absorbed?
Red, Orange, Yellow, Green, Indigo, Violet
Which color(s) are being reflected?
None…Black is the absence of light
Which color(s) are being absorbed?
All….ROYGBIV
Which color(s) are being reflected?
All…ROYGBIV
Which color(s) are being absorbed?
None
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
– That’s why leaves look green
– Green light not used by plants
• Reds and blues most used in photosynthesis
Photosynthesis
• Defined: process
that captures solar
energy to make
sugars
• Endergonic
reaction: Reaction
that requires energy
(sunlight)
• Who: Autotrophs
(Plants, algae, some
bacteria)
• End Result: Sugar
& oxygen waste
Stage 1: Light Dependent (Light Reactions)
Thylakoid
membrane
Thylakoid
membrane
ATP
H2O
ATP
H2O
H2 O
ATP
ATP
H
2O
Thylakoid
membrane
ATP
H
2O
ATP
H
2O
• Where: Thylakoid membranes of chloroplast
• What happens?
1) Sunlight converted into ATP energy
2) Water (H2O) broken apart
• Hydrogen kept for later use; Oxygen is released as a waste
• End result: ATP, H2, Oxygen
Stage 1: Light Dependent (Light Reactions)
What is used during the
light dependent stage?
What is created during the
light dependent stage?
Stage 2: Light Independent (Dark Reaction)
O2
CO
C
H2
ATP
CO
C
O2
ATP
H62H12O6 H2
C
C
CO
O2
CO
C
O2
ATP
C6H12O6
CO
O2
ATP C
C6H12O6
H2
ATP
CO
C
O2
ATP
C6HH12O6
H2
2
Stroma (fluid interior)
• Where: Stroma (fluid interior) of chloroplast
• What happens?
– CO2 taken in
– ATP breaks apart CO2 + H2
– C’s, O’s, and H’s recombine into C6H12O6 (Glucose)
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
Plant Cell
glucose
chloroplast
glucose
chloroplast
ATP
mitochondria
ATP
mitochondria
• In Plants
– Create glucose through photosynthesis
– Glucose is used to make ATP through cellular respiration
Connection between photosynthesis & respiration
Animal Cell
Plant Cell
mitochondria
ATP
chloroplast
glucose
glucose
glucose
Glucose
Glucose
Glucose
• In Animals
– Plants create glucose through photosynthesis
– Animals eat the plants
– Glucose is used to make ATP through 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.