national 4/5 biology
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National 4/5 Biology. 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 - PowerPoint PPT PresentationTRANSCRIPT
National 4/5 BiologySection 4
The Chemistry of PhotosynthesisRaw materials
What do you know?What is the basic word equation for photosynthesis?
A. Glucose + oxygen Carbon dioxide + waterB. Light + Glucose Carbon dioxide + waterC. Oxygen + carbon dioxide Glucose + waterD. Carbon dioxide + water Glucose + oxygen
What do you know?Where does the water come from?
A. LeavesB. FruitC. RootsD. 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 fromSuccess 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 leafWater
- 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 + OxygenCO2 H2O C6H12O6 O2
What do the pores look like and what are they called?
The pores are called stomataThey allow gases to pass in and out of the leafOnce 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 CO2 and O2 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 matWrite 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 phloemWhy stomata are
necessaryThe raw materials for photosynthesis and
how they enter the plant