Photosynthesis

Why is it important to the plant?

The general Process

• Step One- absorb sunlight• Step Two- turn sunlight into usable energy• Step Three- Use energy to produce

biomolecules

Leaf Pigments

Light Absorption and Reflection

Why Leaves are Green

The Purpose of Pigments

Location of Pigments

Photosynthesis Step One

Types of Pigments

• Chlorophyll- C55H72O5N4Mg- green• Xanthophylls- yellow• Carotenoids- yellow/orange• Anthocyanins- red

Look at Leaf Chromatography

• Put yourself into groups based on the color of your original leaf

• What do you all have in common? • Discuss and write the colors present on your

chromatography slip

Analysis Questions

• What pigment is missing when leaves change colors?

• Why do leaves have more than one pigment?• What colors are most useful for plants?• Why do you think leaves change colors?

Life Cycle of Deciduous Plants

Why Leaves Change Colors

How These Pigments Start Photosynthesis

• Step One: light absorption – Where does this process take place– What is occurring in this process– What role do the pigments play

What happens to electrons when they gain energy?

Chlorophyll Releases an Electron

Draw The Process

What things are needed to start the process?

What things are produced?

How is Light Used

How is water used?

Exit Slip Questions

• What changes occur in the leaves during fall?• Why do plant leaves have more than one

pigment?• Summarize the process of light absorption.

Make sure to include the following terms: water, hydrogen ions, oxygen, light, electrons, chlorophyll, enzyme