Revised 6/23/08
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Photosynthesis PowerPoint PPT Presentation


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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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Photosynthesis

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Photosynthesis

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!


Photosynthesis

PHOTOSYNTHESIS

Photosynthesis


What is the ultimate source of all energy

What is the ultimate source of all energy


How does the energy get from the sun into the foods we eat

energy

energy

How does the energy get from the sun into the foods we eat?


Why do we see colors

Why do we see colors?

  • The sun sends downs little packets of light energy called:

    PHOTONS


Photosynthesis

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


Photosynthesis

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?


What process captures the light energy and uses it to make food

What process captures the light energy and uses it to make food?


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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