Welcome to Class! 11-11 Complete the following:  Turn In Home Fun: Cornell notes  Photosynthesis Process details  Concept Map  Homefun:  Bring 3 different.

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Presentation transcript:

Welcome to Class! Complete the following:  Turn In Home Fun: Cornell notes  Photosynthesis Process details  Concept Map  Homefun:  Bring 3 different leaves from your house

The Process of Photosynthesis

Learning Objectives  Describe what happens during the light-dependent reactions.  Describe what happens during the light-independent reactions.  Identify factors that affect the rate at which photosynthesis occurs.

Light-Dependent Reactions Photosynthesis involves two primary sets of reactions: light-dependent reactions and light-independent reactions.

Light-Dependent Reactions Light-dependent reactions use energy from sunlight to produce ATP, NADPH, and oxygen. Thylakoid

Thylakoids contain clusters of chlorophyll and proteins known as photosystems.

Light-Dependent Reactions Use energy from sunlight to produce oxygen Convert ADP and NADP + into energy carriers ATP and NADPH photosystem II electron transport chain photosystem I hydrogen ion movement / ATP formation

Photosystem II Absorbs light energy and produces high-energy electrons Splits water molecules, releasing H+ ions and oxygen

Electron Transport Chain A series of electron carrier proteins shuttle high-energy electrons during ATP-generating reactions.

Photosystem I Electrons are reenergized Second electron transport chain transfers electrons to NADP+, producing NADPH

Hydrogen Ion Movement/ATP Formation The difference in both charge and H+ ion concentration across the membrane provides the energy to make ATP.

Light-Dependent Reactions Summary The light-dependent reactions produce oxygen gas and convert ADP and NADP + into the energy carriers ATP and NADPH.

Light-Independent Reactions ATP and NADPH are used to synthesize high-energy sugars.

Carbon Dioxide Enters the Cycle Six carbon dioxide molecules from atmosphere combine with six 5-carbon molecules Produces 12 3-carbon compounds.

Sugar Production Energy from ATP and high-energy electrons from NADPH are used to convert the 3-carbon molecules to higher- energy forms.

Light-Independent Reactions Summary

Factors Affecting Photosynthesis Important factors that affect photosynthesis include temperature, light intensity, and availability of water. Some plants have adapted to extremely bright, hot conditions: C4 plants and CAM plants.

Student Worksheet Answers