Photosynthesis Powerhouse Slides
Botanical Blueprint
The Science of Photosynthesis
7th Grade Biology
The Big Question
"How does a plant transform invisible sunlight into the physical food it needs to grow?"
Energy Source
Transformation
Matter Produced
Energy Flow
Solar Energy
Plants capture radiant energy from the sun as photons.
Chemical Energy
This energy is stored in the bonds of sugar molecules.
Glucose (C6H12O6)
The Reactants
Water
H2O
Absorbed by roots
CO2
Carbon Dioxide
Enters through leaves
Sunlight
Radiant Energy
Captured by chlorophyll
The Solar Factory
The Chloroplast Organelle
- Site of all photosynthesis steps.
- Contains green pigment called chlorophyll.
- Double membrane protects inner reactions.
Blueprint View
Anatomy & Labels
Thylakoid
Individual sacs that catch light. Stacks are Grana.
Stroma
The thick fluid filling the rest of the space.
Stroma
Thylakoid
The Power of Green
Chlorophyll Pigment
Located in thylakoids. It absorbs red and blue light energy, but reflects green wavelengths.
Absorbs Energy
Powers Reaction
The Chemical Equation
6 CO2 Carbon Dioxide
6 H2O Water
Light
C6H12O6 Glucose
6 O2 Oxygen
"6 CO2 + 6 H2O + Light → C6H12O6 + 6 O2"
1
Light Reactions
Location
Thylakoid Membranes
The Action
Sunlight splits H2O molecules to release Oxygen (O2).
IN: WATER
OUT: OXYGEN (O2)
2
Dark Reactions
Location
The Stroma (Fluid)
The Action
Uses CO2 and energy to build Glucose sugar (C6H12O6).
IN: CO2
OUT: SUGAR
The Outputs (Products)
Glucose
Sugar that stores solar energy as chemical energy for the plant and all other life.
Oxygen
Released as a byproduct. This is the Oxygen (O2) that animals must breathe.
Life's Foundation
01
Starts every food web on Earth
02
Balances Oxygen and CO2
03
Reduces Greenhouse Effect
Recap
- Reactants: CO2, H2O, & Light
- Location: Chloroplast organelle
- Pigment: Chlorophyll (Reflects Green)
- Products: Sugar & Oxygen (O2)
Rapid Review
1. Where are light-absorbing pigments found?
A) Stroma
B) Thylakoids
2. Which gas is an output of photosynthesis?
A) Carbon Dioxide
B) Oxygen
Green Power
Ready for Cellular Respiration?
Grow
Fuel
Breathe