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Photosynthesis. autotrophs – make their own food from the sun’s energy **ALL LIFE DEPENDS ON AUTOTROPHS**. Importance of plants: food shelter drugs O 2 soil fertility clean H 2 O fossil fuel wood prevent soil erosion. heterotrophs –

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photosynthesis
Photosynthesis

autotrophs –

make their own food from the sun’s energy

**ALL LIFE DEPENDS ON AUTOTROPHS**

Importance of plants:

food shelter drugs O2

soil fertility clean H2O fossil fuel

wood prevent soil erosion

slide2
heterotrophs –

cannot make their own food from the sun’s energy, they rely on autotrophs

slide3
Cells need Energy

ATP = Adenosine Triphosphate

low energy bond

A—P—P—P

high energy bonds

When a cell needs energy, high energy bonds are broken by an enzyme.

+ P

A—P—P—P A—P—P

(ATP) (ADP)

energy

slide5
Jan Van Helmont

Planted a seed in a pot of soil (mass = 2g)

5 years later the mass of the tree was 75,000g

Where did the increase in mass come from?

His conclusion was from the

H2O = hydrate

That’s only partly correct.

Most of the mass comes from CO2

slide6
Joseph Priestley

Discovered that plants

released oxygen (O2)

photosynthesis reaction
Photosynthesis Reaction

Photosynthesis -- plants convert sunlight (chemical energy) into sugar (carbohydrates)

photo = light

synthesis = to make

slide9

Light

6

CO2

6

H2O

C6H12O6

+

6

O2

+

The Balanced Photosynthesis Equation

slide10
Visible Light Spectrum

The suns energy travels in waves

The distance between waves = wavelength

Different wavelengths of light are visible as different colors

slide11

ROY G BIV

Longest wavelength = Least amount of energy

Shortest wavelength = larger amount of energy

slide12
Chloroplasts

Have chlorophyll and accessory pigments that trap different wavelengths of light

Chlorophyll –

reflects Green light

Accessory pigments --

Carotenoids (Kuh-RAHT-uhn-OYDZ)

reflect Yellow, Orange, & Red light

Elodea leaf

slide13

8-1

Why do plants lookGreen?

There is much more chlorophyll than the other pigments (the other colors are masked).

In the Fall, chlorophyll is broken down and the accessory pigment colors are shown.

Why do trees lose leaves in the winter?

It’s difficult to absorb H2O from frozen ground so leaves drop off to save water.

slide14
As the chlorophyll in leaves decays in the Fall, the green color fades and is replaced by the oranges and reds of carotenoids
photosynthesis1
Photosynthesis

There are two reactions to photosynthesis

1. Light-Dependent reaction

“LIGHT”

* only occurs in light

* occurs in the thylakoid membrane

chloroplast

* photosystem II

* photosystem I

* H2O&sunlight make (ATP) & release (O2)

slide16
2. Light-Independent reaction(Calvin Cycle)

“DARK Reaction”

* can occur in the light or dark

* occurs in the stroma of the chloroplasts

* Reactant CO2

* Energy ATP (from the light-dependent reaction)

* Product C6H12O6 (glucose)

factors affecting photosynthesis
Factors Affecting Photosynthesis
  • Water
  • Temperature
  • Light intensity
slide18

Use the following words to fill in the drawing:

C6H12O6 -(5)

Sunlight - (4)

CO2 - (4)

H20 - (5)

O2 - (4)

photosynthesis2
Photosynthesis

Summary

Light reaction (Location: thylakoid)

ReactantsProcessesProducts

1. 1.

2. 2.

  • 1.
  • 2.
photosynthesis3
Photosynthesis

Summary

Light reaction (Location: thylakoid)

ReactantsProcessesProducts

1. light 1. O2

2. H2O 2. energy (ATP)

  • 1. Photosystem II
  • 2. Photosystem I