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Photosynthesis Chapter 8-2 and 8-3

Photosynthesis : 

Photosynthesis Photosynthesis: uses the energy of sunlight to convert water and carbon dioxide into high energy carbohydrates 6CO2 + 6H2O ---light C6H2O6 + 6O2 Carbon dioxide + water --- light sugars + oxygen

Photosynthesis Equation: 

Photosynthesis Equation 6CO2 + 6H2O ---light C6H2O6 + 6O2 Reactants: carbon dioxide water Products: carbohydrates oxygen

Who does photosynthesis? : 

Who does photosynthesis? Plants and other organisms that contain the pigment, chlorophyll Chlorophyll is stored in the chloroplasts of a plant cell

Where does photosynthesis happen? : 

Where does photosynthesis happen? Photosynthesis occurs within the chloroplasts


Chloroplasts Thylakoids- photosynthetic membranes Granum- stack of thylakoids Stroma- space outside the thylakoids Photosystems- clusters of pigment & protein that absorb light energy (I & II)

Two Parts of Photosynthesis: 

Two Parts of Photosynthesis Light dependent reactions- take place within the thylakoid membranes Light independent reactions (Calvin Cycle)- takes place within the stroma

Light Dependent Reactions: 

Light Dependent Reactions Figure 8-10 on page 211 Sunlight is absorbed by Photosystem II The sunlight breaks down water molecules stored within Photosystem II The water is broken and its electrons gain energy These excited electrons leave the photosystem and are passed through an electron transport chain

Light Dependent Reactions: 

Light Dependent Reactions As the electrons move, they provide energy to move H+ ions from the stroma across the thylakoid membrane into the thylakoid When the electrons reach Photosystem I, they are reenergized by sunlight

Light Dependent Reactions: 

Light Dependent Reactions The reenergized electrons are picked up by NADP and are used to create NADPH At the same time, electrons inside the thylakoid create a concentration gradient of H+ ions This gradient is used to power an enzyme called ATP synthase, which synthesizes ATP

Light Dependent Reactions : 

Light Dependent Reactions Reactants: water sunlight NADP ADP Products: Oxygen NADPH ATP

Electron Transport : 

Electron Transport

ATP Synthase: 

ATP Synthase

Light Independent Reactions: The Calvin Cycle: 

Light Independent Reactions: The Calvin Cycle The Calvin Cycle uses the NADPH and ATP produced in the light dependent reactions to create high energy sugars Figure 8-11 on page 212

The Calvin Cycle : 

The Calvin Cycle Carbon dioxide molecules from the atmosphere enter the stroma The carbon dioxide joins with other carbon molecules to form 3-carbon molecules called PGA The PGA molecules use energy from ATP and NADPH to convert into PGAL

The Calvin Cycle : 

The Calvin Cycle Some of the PGAL leaves the cycle and is used in other parts of the plant cell But the majority of PGAL molecules are converted back into PGA and continue in the cycle After six rounds of the Calvin Cycle, one molecule of glucose is produced

The Calvin Cycle : 

The Calvin Cycle Reactants: Carbon Dioxide NADPH ATP Products: Glucose

The Calvin Cycle : 

The Calvin Cycle



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