Slide 1

Question:Some plant leaves contain yellow and red pigments as well as chlorophyll.

In the fall, those leaves may become red or yellow.

Suggest an explanation for those color changes.Explanation for color changeThe chlorophyll may be broken down by the cooling temperatures or the changing light, so the green color disappears.

A leaf then shows the color of its remaining pigment(s).What wavelengths of light do you think plants use the least in photosynthesis?

How plants harness energy from sunlightPhotosynthetic pigmentsChlorophyll a the main photosynthetic pigmentChlorophyll bAccessory pigments..

CarotenoidsPhotosystems use some wavelengths of light but reflect others

internal leaf structurechloroplastsouter membraneinner membranethylakoidPlant PhotosynthesisPhotosynthesis Video6http://videos.howstuffworks.com/hsw/11886-plants-photosynthesis-video.htmhttp://videos.howstuffworks.com/hsw/12579-the-science-of-life-photosynthesis-video.htm

Figure: 06-01

Title:An overview of photosynthetic structures.

Caption:An overview of photosynthetic structures.

Photosynthesis can be described by the following reaction6CO2+6H2O---- C6H12O6 + 6O2

Carbon dioxide and water with sunlight yields (produces) glucose and oxygen gas

Where does photosynthesis take place?

Inside the leaves.Within the chloroplasts of the leaf cells.

This whole thing is a chloroplast and inside are the thylakoids stacked up to form granum.

Photosynthesis takes place in two stages

The stages of photosynthesisLight Dependent Reactions

REQUIRES lightTake place in the Thylakoid membrane of chloroplastSplits water produce O2 gas and H+ ionsProduce ATP and NADPH

Photosynthetic pigments are arranged as photosystems

Analogy of the way electrons are being passed on from one photosystem to next.This is all happening in the light dependent reaction. The first photosystem is called Photosystem II because it was discovered after Photosystem I.15Light Dependent Reactionhttp://www.youtube.com/watch?v=eY1ReqiYwYs&feature=related16Photosystem: light capturing unit, contains chlorophyll, the light capturing pigmentElectron transport system: sequence of electron carrier molecules that shuttle electrons, energy released to make ATPElectrons in chlorophyll must be replaced so that cycle may continue-these electrons come from water molecules, Oxygen is liberated from the light reactionsLight reactions yield ATP and NADPH used to fuel the reactions of the Calvin cycle (light independent or dark reactions)

Light-dependent ReactionsTakes place in the stroma (inside the chloroplast, but outside the thylakoid)Does not require lightDoes require ATP and NADPHCO2 is transformed into glucoseLight Independent Reactions

The stages of photosynthesis

Putting it all together

http://www.youtube.com/watch?v=Bdc-fHn0zAU&feature=fvw20Factors affecting PhotosynthesisWater availability

Temperature (0-35 C)

Light Intensity

Cellular Respiration occurs in the MitochondriaCellular Respiration is the process that releases energy by breaking down glucose and other food molecules in the presence of oxygen.

The Big Picture: In the presence of Oxygen, Glycolysis is followed by the Krebs Cycle and then Electron Transport Chain.

Glycolysis is the process in which one molecule of glucose is broken in half, producing two molecules of pyruvic acid, a 3-carbon compound.

Cellular Respiration6O2 + C6H12O6 6CO2 + 6H2O + Energy

Have students draw this picture on the bottom of their notes.http://videos.howstuffworks.com/hsw/12580-the-science-of-life-cellular-respiration-video.htm24Two More VideosCellular Respiration

Respirationhttp://www.youtube.com/watch?v=iXmw3fR8fh0http://videos.howstuffworks.com/hsw/14761-simply-science-cellular-respiration-video.htm25On the back of your notesCellular Respiration Flow ChartUse flow chart from CD (from Biologycorner.com)26