H2O + CO2 C6H12O6 + O2

Photosynthesis

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Where does it occur again?

The chloroplast!

1) The Light Dependent Reactions – occurs in the thylakoids; the sun’s energy is transferred from chlorophyll to high energy electron carriers and ATP

2) The Calvin Cycle – occurs in the stroma (outside the thylakoid); uses the energy generated from the Light reactions to build sugars

There are two main parts the differ in their location in the chloroplast:

What is an electron carrier?

• A molecule that can hold the energy generated from high energy electrons in order to take the energy to where it can be used in the cell

• Carriers that can transfer energy for the cell are part of an electron transport chain that commonly makes energy for the cell

Ex: NADP+ + H+ + 2e- NADPHHigh NRG!!!!

1st Part – Light reactions

What does it involve?

It takes the sun’s energy and H2O and uses them to make ATP and NADPH while giving off the O2 that isn’t used

Let’s see how this works…..

HINT: Look for the orange parts above next.

How does the ATP synthesis work?

ATP synthase is a membrane protein in the thylakoid that uses the energy produced when the H+ ions flow through it to make ATP from ADP + P

What type of cell transport is this? Why?

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ATP Synthase

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Light Reactions Summary

• Reactants = sun + water

• Produced =– ATP – energy for the Calvin cycle– NADPH – carries energy to the Calvin cycle– Oxygen – released through the stomata

Sunlight + H2O + CO2 C6H12O6 + O2

Calvin Cycle/Dark Reactions

Calvin Cycle/Dark Reactions

• What are the reactants? Why?– ATP– NADPH

– CO2

• What are the products? Why?– C6H12O6

Calvin Cycle Summary:

• The energy from the ATP and NADPH is used to convert carbon dioxide into sugar energy

Sun + H2O + CO2 C6H12O6 + O2

Let’s Review……

• Plant Video

• Complete the second half of the 8-3 worksheet

• Homework: Do 8-3 Questions pg 214, #1-5