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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
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
• 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)
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
H2
H2
CO
C
O2
ATP
C
CO
O2
ATP
CO
C
O2
H2
ATP
C6H12O6
CO 2
CO
ATP
CO
C
O2
ATP
H2
H2
Stroma (fluid interior)
• Where: Stroma (fluid interior) of chloroplast
• What happens?
– CO2 is 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
• 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.