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Revised 6/23/08 The details of photosynthesis are to help students with the bigger picture – don’t test over details, test over concepts and overall targets!. PHOTOSYNTHESIS. Photosynthesis. What is the ultimate source of all energy. energy. energy.

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Presentation Transcript
slide1
Revised 6/23/08The details of photosynthesis are to help students with the bigger picture – don’t test over details, test over concepts and overall targets!
why do we see colors
Why do we see colors?
  • The sun sends downs little packets of light energy called:

PHOTONS

slide6
Why do we see colors?
  • Photons group together in waves
  • The waves have different lengths
  • Each “wavelength” presents itself as a color

Photons

Wavelengths

why do we see colors1
Why do we see colors?

Plants reflect this color

of light. That’s why

most plants are GREEN

Plant pigments like chlorophyll absorb these

colors of light so these colors are not seen.

What colors of light would a plant

with purple leaves absorb?

what colors are being absorbed and what colors are being reflected
What colors are being absorbed and what colors are being reflected?

Photos courtesy of flowerpictures.net and picturesof.net

why do we see colors2
Why do we see colors?
  • What do we call the compounds that absorb and reflect wavelengths of light?
  • Which compound reflects the green wavelengths thereby making plants green?
  • Where would we find this compound?
chloroplast structure
Chloroplast structure

Disks called GRANA contain the pigment

CHLOROPHYLL.

The liquid portion of a chloroplast is the STROMA

slide11
Where do

wefind

chloroplasts?

chloroplasts are found in cells of leaves
Chloroplasts are found in cells of leaves.

Chloroplast containing chlorophyll

stoma

review
Review
  • What is the ultimate source of all energy?
  • In what form does light energy come to the earth?
  • What compounds absorbs wavelengths?
  • How do we see colors?
  • Where in a leaf do we find pigments?
overview of photosynthesis
OVERVIEW OF PHOTOSYNTHESIS

SUNLIGHT PROVIDES

THE ENERGY

FOR PHOTOSYNTHESIS

PLANTS MAKE GLUCOSE

AND OXYGEN

PLANTS TAKE IN

CO2 AND H2O

photosynthesis1
light

chlorophyll

Photosynthesis
  • What is photosynthesis?
  • Photosynthesis is the process by which:

TAKE IN

AND USING

MAKE

oxygen

water

PLANTS

(producers)

glucose

carbon dioxide

photosynthesis2
Dark Reaction

Light Reaction

Photosynthesis
  • 2 steps:
    • Light reactions
    • Dark reactions (aka Calvin cycle)
who was calvin anyway
A member of the faculty at UC Berkeley since 1937, Melvin Calvin received the 1961 Nobel prize in chemistry for identifying the path of carbon in photosynthesis.

The cycle of reactions in the dark phase of photosynthesis was named after him for his work in identifying the processes taking place.

Who was Calvin anyway?
photosynthesis3
Light reaction:

Occurs in the grana

Must have light

light

Dark Reaction

Dark Reaction

LIGHT REACTION

Light Reaction

grana

(chlorophyll)

Photosynthesis
photosynthesis4
Dark reactions (aka Calvin cycle):

Occurs in the stroma

Occurs in the light and dark

DARK REACTION

Light Reaction

Dark Reaction

Light Reaction

stroma

(liquid)

Photosynthesis
step 1 light reactions
ENERGY

H2O

H

H

Step 1: Light Reactions

How does

the O2 leave

the leaf?

light energy reacts with the chlorophyll

water is split by the light energy

H is kept for the dark reaction

O2 is released

O2

O2

O2

O2

O

H2

O2

step 2 dark reactions
+

H

CO2

C6H12O6

Step 2: Dark Reactions

glucose is the product

H from the water split in the light reaction is present

the reactants H and CO2 combine

CO2 enters the chloroplast

CO2

How does CO2enter the plant?

  • AKA: CALVIN CYCLE

CO2

CO2

CO2

H

H

  • Other carbohydrates besides glucose may be made in photosynthesis
photosynthesis review
Dark Reaction

Light Reaction

Photosynthesis Review
  • Light reactions: H2O split into H2 + O
  • Dark reactions: H + CO2 = C6H12O6

O2

H2O

C6H12O6

chlorophyll

CO2

photosynthesis formula
How would this be written as a chemical equation?

What goes in? (the reactants)

What comes out? (the products)

O2

Dark Reaction

Light Reaction

H2O

C6H12O6

chlorophyll

CO2

Photosynthesis Formula

H2O

CO2

C6H12O6

O2

photosynthesis formula1
What’s wrong with this equation?

The number of atoms is not equal on both sides of the equation.

Balance the equation so that the number of atoms of each element is equal on both sides.

one carbon atom reactant

6 carbon atoms product

H2O

CO2

C6H12O6

O2

Photosynthesis Formula

6

(1)

6

6

  • Now balance it as if TWO glucose molecules were being produced.
try this
TRY THIS!
  • Think-Pair-Share

Analyze the relationship between photosynthesis, biogeochemical cycles, and food chains.

photosynthesis review1
What goes in? (the reactants)

What comes out? (the products)

light

chlorophyll

  • 6CO2 + 6H2O 6O2 + C6H12O6

O2

Dark Reaction

Light Reaction

H2O

C6H12O6

chlorophyll

CO2

Photosynthesis Review
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