PHOTOSYNTHESIS

Do Now: What is an autotroph?

Quick Recap:

• ALL energy to support life comes from:

Th Sun (solar energy)

Energy comes from the sun then ( don’t write)…

• Autotrophs:– Convert the sun

energy to chemical energy

– PRODUCERS

• Heterotrophs– Consume the chemical

energy to get energy– CONSUMERS

Photosynthesis:

• Uses energy from the sun

• To create energy as Sugar (glucose)

Sunlight + water + carbon dioxide oxygen + glucose

Energy + 6H2O + 6CO2 6O2 + C6H12O6

Where does Photosynthesis take place?

• thylakoids:– Location of Light

Reaction– Absorbs sunlight using

chlorophyll (pigment that reflects green light)

• Stroma: – Compare to cytoplasm of

cell.– Jelly-like substance that

surrounds thylakoid– Location of Calvin Cycle

• Takes place in the CHLOROPLAST

Grana = stack of thylakoids

thylakoids Stroma

The two main stages of photosynthesis are…

• Light Reaction • Calvin Cycle– (AKA Dark Reaction).

Two reactions are connected through

1.ATP

2.NADPH

Each fuels the other

The light reaction: First stage of photosynthesis- chlorophyll absorbs light

energy

• LOCATION: – thylakoid membrane

• WHAT GOES IN?– Water– Sunlight

• WHAT COMES OUT?– Oxygen

• WHAT IS GIVEN TO CALVIN CYCLE?– ATP and NADPH

Calvin Cycle (Dark Reaction): uses energy making molecules from Light Reaction to

make sugars

• LOCATION:– Stroma: (fluid

surrounding thylakoids)

• WHAT GOES IN?– Carbon Dioxide

• WHAT COMES OUT?– Sugars

• Glucose