Objective: You will be able to write the equation of photosynthesis. Do Now: Read “Autotrophs and heterotrophs” on p. 201 Differentiate between autotrophs and heterotrophs

Photosynthesis Equation 6CO 2 + 6H 2 OC 6 H 12 O 6 + 6O 2 Carbon + WaterGlucose + Oxygen Dioxide

Bromothymol Used to test for the presence of carbon dioxide (CO 2 ) If CO 2 is present it is a yellow color If CO 2 is NOT present it is a blue color

Objective: You will be able to identify and give the function of the parts of a leaf. Do Now: Read “Light and pigments” on p. 207 List the FOUR things that plants need to have for photosynthesis

Vein Leaf cross section Figure 10.3 Mesophyll CO 2 O2O2 Stomata

Chloroplasts: The Sites of Photosynthesis Chloroplast Mesophyll 5 µm Outer membrane Intermembrane space Inner membrane Thylakoid space Thylakoid Granum Stroma 1 µm

Activity View a leaf slide under medium power Locate the stomata –They should be on the bottom, if they are on top you slide is upside down. Draw a small region of the leaf Label the various parts of a leaf that we learned about

Objective: You will be able to identify experimental variables Do Now: Read “Setting up a controlled experiment” on p. 9 Differentiate between manipulated and responding variables

Controlled Experiments Have an independent variable –The “thing” that you are changing Have a dependent variable –The “thing” that is affected when you change the independent variable Manipulated variable? Responding variable?

Example Which color light works best for photosynthesis? What is the: –Independent (manipulated) variable? –Dependent (responding) variable?

Controlled experiments Also use one setup known as the control group A control group is where the manipulated variable is removed You can think of the control group as being used for comparison

Examples of controls What color light is best for photosynthesis? –Control is one that does not have a particular color of light. Will plants grow more if fertilizer is added? –Control is the setup that does not get the fertilizer

You try What affect does the intensity of light have on photosynthesis? Using a partner come up with the: –Manipulated variable –Responding variable –Control group

Problems 1.Will plants carry out more photosynthesis if they are given more CO 2 ? 2.Will plants grow more if they are exposed to “dark light”? 3.Can plants produce more oxygen if you talk to them? 4.What type of music will cause plants to release more oxygen? 5.What effect does temperature have on the growth of plants?

Objective: You will be able to explain how plants can absorb light for photosynthesis. Do Now: Read “Light and pigments” again on p. 207 What colors of light are absorbed by a plant?

Chloroplast Mesophyll 5 µm Outer membrane Intermembrane space Inner membrane Thylakoid space Thylakoid Granum Stroma 1 µm

Gamma rays X-raysUVInfrared Micro- waves Radio waves 10 –5 nm 10 –3 nm 1 nm 10 3 nm 10 6 nm 1 m 10 6 nm 10 3 m nm Visible light Shorter wavelength Higher energy Longer wavelength Lower energy Figure 10.6

Light Reflected Light Chloroplast Absorbed light Granum Transmitted light Figure 10.7