Transcript Choices - Cloudfront.net

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
White light
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
White light
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
White light
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
White light
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
White light
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
• 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?
C OO H
– 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
Connection between photosynthesis & respiration
• Plants
– Create their own glucose
through photosynthesis
– That glucose is used during
respiration to make ATP for
the plant’s cells
• Animals
– Animals eat plants to obtain
their glucose
– Plant glucose is used by
animal cells to make ATP
during the respiration process
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.