• Based on what you discovered yesterday, why do leaves change colors in Autumn?

PhotosynthesisPhotosynthesis

What is Photosynthesis?

• Process by which green plants convert the energy from sunlight or light into chemical energy (glucose).

• Obtains the energy from white light.

Autotrophs vs. Heterotrophs

• Autotrophs---producers, makes their own food

• Heterotrophs---consumers, must obtain or eat food

• Autotrophs go through photosynthesis OR ChemosynthesisAutotrophs vs.

Heterotrophs

Photosynthesis/Respiration Cycle

Ingredients of Photosynthesis

• White Light (Sunlight)

• Pigments– Chlorophyll– Accessory Pigments

• ATP

• CO2

• H2O

ATP

ATP = adenosine triphosphate

P

P

Big EnergyBond – Lots Chemical Energy Released

P

Three phosphate Three phosphate groupsgroups

Adenine nitrogen groupAdenine nitrogen group

Ribose sugarRibose sugar

ADP-ATP Cycle

P

White Light

• White Light= ROY G BIV• Colors Appear the way they do because the light is

REFLECTED • WHAT LIGHT IS IMPORTANT IN

PHOTOSYNTHESIS?...

Types of Pigments

•Chlorophyll---Green Chlorophyll---Green (reflected)(reflected)

•Accessory PigmentsAccessory Pigments– Carotenoids:Carotenoids:

•Xanthophyll---YellowXanthophyll---Yellow•Carotene---OrangeCarotene---Orange

Why so many colors?

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R O Y G B I V

Colors

Absorbancy

Formula for Photosynthesis

H2O + CO2 O2 + C6H12O6

Where Photosynthesis Takes Place

• Leaf• Mesophyll Cells• Organelle responsible for

Photosynthesis– Chloroplast

• Contain Plant Pigments That Capture the Sun’s Energy

• Thylakoid- Light Reactions• Stroma- Dark Reactions

Where the 2 Reactions of Photosynthesis take place

                 

                

Thylakoids

• This is where the first phase of Photosynthesis takes place.

• Which is also know as the light reaction.

• Involves the trapping of light energy and the formation of materials.

• Produces Oxygen by breaking down H2O into free Electrons, H+ and O

• H+ go to stroma, releasing energy for ATP Production.

Stroma

• This is where the second phase, the Calvin Cycle, of Photosynthesis takes place.

• Which is also known as the dark reaction.

• Produces glucose from H+ and CO2.

• Uses the products from the light reactions to form glucose.

Summary!

• Green Plants Are Excellent At Capturing the Sun’s Energy

• They Make A Huge Amount of Glucose With A Little Of Energy From the Sun

• Hey, They Actually Eat Their Own Glucose Through Aerobic Respiration