Photosynthesis 1 Light reaction Recap 2 Calvin Cycle

Talk to a Neighbor… n Using the following diagram, walk your partner through the

Summary of Part 1: Video clip Using light energy ADP NADP+ H 2 O

n O 2 gas is released as a by-product through the stomata (pores) on

Part 2: Calvin Cycle n aka Light-Independent rxn or Dark rxn n Does NOT

Calvin Cycle uses ATP & NADPH to produce high-energy sugars

Energy taken out of NADPH & ATP & combined w/CO 2 & H+ forming

NADP & ADP recycled back to light reaction Glucose can be converted by cells

Factors that affect the rate of photosynthesis? n Amount of water & CO 2

Reactants • Diagram Light H 2 O CO 2 NADP+ ADP + P Light

Summary: • Light Dependent Reaction—H 2 O is broken down and light energy is

What are the reactants for photosynthesis? n What are the products?

Where in the chloroplast do lightindependent reactions occur? Stroma

Where do the ATP and NADPH used in the Calvin Cycle come Light Reactions

What are the 3 factors that affect the rate of photosynthesis?

Where does gas exchange occur on the leaf?

What happens to the O 2 produced by the light reactions?

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Photosynthesis 1. Light reaction Recap 2. Calvin Cycle (dark reaction)

Talk to a Neighbor… n Using the following diagram, walk your partner through the 5 steps of the lightdependent reactions

Summary of Part 1: Video clip Using light energy ADP NADP+ H 2 O changed into ATP NADPH H+ & O 2

n O 2 gas is released as a by-product through the stomata (pores) on the leaf n The energy of ATP and NADPH are now used to power Part 2 of photosynthesis: The Calvin Cycle (Light-Independent Reactions)

Part 2: Calvin Cycle n aka Light-Independent rxn or Dark rxn n Does NOT need light because energy from sun already captured in NADPH & ATP n Occurs in stroma

Calvin Cycle uses ATP & NADPH to produce high-energy sugars

Energy taken out of NADPH & ATP & combined w/CO 2 & H+ forming C 6 H 12 O 6

NADP & ADP recycled back to light reaction Glucose can be converted by cells into lipids, proteins, nucleic acids, etc.

Calvin Cycle Video

Factors that affect the rate of photosynthesis? n Amount of water & CO 2 (reactants) n Temperature - too high or low denatures enzymes n Intensity of light

Putting it Together…

Review light rxn

Reactants • Diagram Light H 2 O CO 2 NADP+ ADP + P Light Dependent Reaction ATP NADPH Chloroplast O 2 Products Calvin Cycle C 6 H 12 O 6 Glucose Word Bank H 2 O Glucose Light Dependent Chloroplast Thylakoids Grana Calvin Cycle Light O 2 Stroma Reactants Products

Summary: • Light Dependent Reaction—H 2 O is broken down and light energy is stored temporarily in energy carriers, ATP and NADPH • Calvin Cycle—energy is transferred from ATP and NADPH to the organic compound glucose

Reactants Products

Questions? ?

What are the reactants for photosynthesis? n What are the products?

Where in the chloroplast do lightindependent reactions occur? Stroma

Where do the ATP and NADPH used in the Calvin Cycle come Light Reactions from?

What are the 3 factors that affect the rate of photosynthesis?

Where does gas exchange occur on the leaf?

What happens to the O 2 produced by the light reactions?

Cornell Summary