photosynthesis
TRANSCRIPT
Photosynthesis
Biology
IntroductionIntroduction PHOTO PHOTO = light = light SYNTHESIS SYNTHESIS = putting together= putting together The synthesis of The synthesis of glucoseglucose (sugar) from (sugar) from
sunlightsunlight, , COCO22, and , and HH22OO OO22 is a waste product is a waste product AutotrophsAutotrophs (green plants, algae) trap (green plants, algae) trap
energy from the sun and build sugars like energy from the sun and build sugars like glucose and starch.glucose and starch.
****Life on earth DEPENDS on photosynthesisLife on earth DEPENDS on photosynthesis****
Pigments and SunlightPigments and Sunlight Leaves of plants contain chlorophyll, a Leaves of plants contain chlorophyll, a
green colored pigment. green colored pigment. Chloros Chloros = = pale greenpale green; ; phyllon phyllon = = leafleaf Chlorophyll reflects green and some Chlorophyll reflects green and some
yellow light while it absorbs the energy of yellow light while it absorbs the energy of all other colors of light.all other colors of light.
Plants look green to us!
First Steps to First Steps to PhotosynthesisPhotosynthesis
Chloroplasts traps energy from the Chloroplasts traps energy from the sunsun
LightLight energy converted to chemical energy converted to chemical energy (sugar such as glucose)energy (sugar such as glucose)
Energy stored as starchEnergy stored as starch water comes from the gound and water comes from the gound and
COCO2 2 from the airfrom the air
Photosynthesis FormulaPhotosynthesis Formula
66 CCOO22 + + 66 HH22O O CC66HH1212OO66 + 6 + 6 OO22
Sugar made here!
Oxygen (O2) made here!
Leaf structure (inside)Leaf structure (inside)
Water from soil, roots
CO2 from air
Chlorophyll
Oxygen
Chlorophyll is in Chloroplasts in Leaves
Chloroplast
Photosynthesis takes place here
Chloroplasts
Leaf X-Section
Real chloroplasts in algae
Two Reactions:Two Reactions:
Light Dependent ReactionsLight Dependent Reactions
Calvin CycleCalvin Cycle
Light Dependent Light Dependent ReactionsReactions
Water is split apart by sunlight:Water is split apart by sunlight:
Hydrogen (H)
H2OOxygen (O2)
Light Dependent ReactionsLight Dependent Reactions
OxygenOxygen diffuses out the leaf for us to diffuses out the leaf for us to breathe.breathe. Hydrogen is used to make Hydrogen is used to make ATP’s ATP’s and is and is
also used in the Calvin Cycle to make also used in the Calvin Cycle to make sugars like glucose and starch.sugars like glucose and starch.
Hydrogen carried toHydrogen carried to Calvin cycle by:Calvin cycle by: NADP – H “truck”NADP – H “truck”
NADP
NADP Truck
Calvin CycleCalvin Cycle Starts with a chemical the holds onto Starts with a chemical the holds onto
COCO22
from the air.from the air. An enzyme named Nabisco (opps I mean An enzyme named Nabisco (opps I mean
Rubisco) helps to fix CORubisco) helps to fix CO2 2 from the air.from the air. NADP – HNADP – H drops off drops off
it’s hydrogen it’s hydrogen ATP ATP is also involvedis also involved
NADPNADP
Starting Compound and rubisco
CO2
H NADP truck
+
+
+
ATP’s
Sugar and Starch
Don’t forget:
Sunlight Energy to
Chemical Energy to
ATP’s in living things to
movement, repair and transport to (Bio Work) to
Heat Energy
Chloroplast
Mitochondrion
Mr. G
Food
All living things depend upon the sun for energy directly and indirectly.