Photosynthesis Why plants don’t “eat”.
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Transcript of Photosynthesis Why plants don’t “eat”.
Photosynthesis Why plants dont eat What is Photosynthesis?
Photo: Light Synthesis: Putting Together Photosynthesis: putting
together with light! Why are plants green? Chlorophyll absorb light
All but green
Green is reflected back! What are the two stages? 1st:
Light-Dependent Reactions 2nd: Light-Independent Reactions Where do
Light-Dependent Reactions Occur?
In the thylakoid stacks of the chloroplast What happens during the
light-dependent reactions?
Sunlight powers the production of ATP Water is broken down into
oxygen What is a waste product here? What are the steps of
Light-Dependent Reactions?
Photosystem II Photosystem I ATP Synthase What happens during
Photosystem II?
Chlorophyll absorbs sunlight Sunlight powers electrons to leave H
from H20 and move through membrane H+ moves through membrane If H
leaves water, what is left? What happens during Photosystem
I?
Chlorophyll still absorbs sunlight Electrons (e-) added to NADP+ to
make NADPH NADPH moves to the ATP Synthase NADP+ ATP Synthase
Photosystem I NADPH What happens during ATP Synthase?
H+ ions move back through membrane Power ATP Synthase to make ADP
from ATP Where have we seen this before? Where do Light-Independent
Reactions Occur?
In the stroma of the chloroplast What happens during
Light-Independent Reactions?
ATP made previously powers making of Glucose CO2 is used to make
C6H12O6 (Glucose) How many steps are there in Light-Independent
Reactions?
ONE! The Calvin Cycle What happens during the Calvin Cycle?
1. A 5-Carbon molecule attaches to a C from CO2 to become a
6-Carbon molecule 2. Energy (ATP) breaks the 6-carbon into 2
3-carbon molecules 3. 1 of the 3-carbon molecules leaves the cycle,
the other continues on. 4. Remaining 3-carbon has energy (ATP)
added to become the 5-carbon molecule we started out with! So how
does that make a Glucose?
Glucose has 6 carbons The 3-carbon molecule that left, after 2
cycles, comes together to make Glucose! 3C+3C=6C