Goals for Today… I will be able to build the foundation for of the process of photosynthesis by understanding the role of light and chlorophyll I will be able to describe the structure of chloroplast and identify where they are found

Where does photosynthesis occur? Be more specific than “plants”

How the Leaf Does it…

Internal Parts Epidermis Skin or barrier to prevent injury to leaf cells Palisade Cells Cells primarily responsible for photosynthesis Spongy Mesophyll Adds structure to leaf Stomata Pores allowing the plant to breath Stomata are used to cool the plant through the process of transpiration

Solar Panels Leaves collect sun energy using chlorophyll found in plant cell organelles (chloroplasts)

Food Storage Glucose produced during photosynthesis is stored in plant parts as an energy source to be available when needed. In the leaf, glucose is converted to cellulose and stored in leaf cells

What is the overall equation for photosynthesis? 6CO2 + 6H2O  C6H12O6 + 6O2

Light-Dependent Reactions (thylakoids) H2O Light-Dependent Reactions (thylakoids) O2 ADP NADP+ ATP NADPH Photosynthesis is a series of reactions that uses light energy from the sun to convert water and carbon dioxide into sugars and oxygen. CO2 + H20 Sugar Calvin Cycle (stroma) Copyright Pearson Prentice Hall

What is the role of light and chlorophyll in photosynthesis?

Light and Pigments How do plants capture the energy of sunlight In addition to water and carbon dioxide photosynthesis requires light and photosynthesis

Plant Pigments Main pigment found in plants is called chlorphyll Two types: Chlorophyll a Chlorophyll b

Look at the following graph. What light is well absorbed? Chlorophyll a absorbs violet and red light well Chlorophyll b absorbs blue and red light

Look at the following graph. What light is not absorbed? Chlorophyll a absorbs violet and red light well Chlorophyll b absorbs blue and red light Green light is not absorbed which is why plants look green

Inside a Chloroplast In plants, photosynthesis takes place inside chloroplast

Inside a Chloroplast Chloroplasts contain thylakoids—saclike photosynthetic membranes. Chloroplast Single thylakoid Copyright Pearson Prentice Hall

Inside a Chloroplast Thylakoids are arranged in stacks known as grana. A singular stack is called a granum. Granum Chloroplast Copyright Pearson Prentice Hall

Inside a Chloroplast Proteins in the thylakoid membrane organize chlorophyll and other pigments into clusters called photosystems, which are the light-collecting units of the chloroplast. Chloroplast Photosystems Copyright Pearson Prentice Hall

Photosynthesis Overview Light is a form of energy  any compound that absorbs light absorbs the energy from that light When chlorophyll absorbs light, energy is transferred directly to electrons which raises the energy levels of the electrons High-energy electrons are what make photosynthesis work