Section 4 The Chemistry of Photosynthesis Raw materials

What do you know? What is the basic word equation for photosynthesis? A. Glucose + oxygen Carbon dioxide + water B. Light + Glucose Carbon dioxide + water C. Oxygen + carbon dioxide Glucose + water D. Carbon dioxide + water Glucose + oxygen

What do you know? Where does the water come from? A. Leaves B. Fruit C. Roots D. Stem

What do you know? Where does the carbon dioxide come from? How does the carbon dioxide get in to the plant? What happens to the glucose that is produced? What happens to the oxygen that is produced? What two extra things are required for photosynthesis not shown in the basic equation?

What are we learning today? We are learning to: -state the word equation for photosynthesis -understand where the raw materials for photosynthesis come from Success criteria: -word equation for photosynthesis -what xylem, phloem and stomata are and what they do -what starch and cellulose are and where they come from

What are the raw materials for photosynthesis? The raw materials for photosynthesis are: -Carbon dioxide -Water How do these things get in to the plant? Carbon dioxide -through pores in the leaf Water -through the roots -how does it get all the way to the top? -must have vessels for transport

Why is carbon dioxide required for photosynthesis? Carbon dioxide is required as the source of carbon to make glucose Carbon dioxide + Water Glucose + Oxygen CO 2 H 2 O C 6 H 12 O 6 O 2

What do the pores look like and what are they called? The pores are called stomata They allow gases to pass in and out of the leaf Once the gases are in the leaf they can diffuse in to the cells for use in chemical processes Look at some stomata under the microscope

Stomata

What can enter and exit through the stomata? Stomata allow gases in and out as well as allowing water to escape from the leaf.

Guard cells control the opening and closing of stomata Stomata open during the day to let CO 2 and O 2 in and out of the leaf and to let water out. Stomata closed at night to conserve water.

How does the water get from the roots to the leaves? Plants have a transport system Xylem vessels are used to transport water and minerals from roots to leaves They have rings or spirals of lignin to support the plant

Look at some xylem under the microscope

What have we learned today? Place mat Write down in your section of the place mat what you learned today Now as a group decide what you thought the main points were One person from class shares what their groups main points are Do the class agree? Structure and function of xylem and phloem Why stomata are necessary The raw materials for photosynthesis and how they enter the plant