Photosynthesis Textbook pages 97 – 103

Photosynthesis Textbook pages 97 – 103 Photosynthesis Textbook pages 97 – 103 - Start

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Photosynthesis Textbook pages 97 – 103




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Presentations text content in Photosynthesis Textbook pages 97 – 103

Slide1

Photosynthesis

Textbook pages 97 – 103

Slide2

Photosynthesis

process used by plants using light energy to create sugar (glucose, C

6

H12O6) from carbon dioxide (CO2) and water (H2O)oxygen gas (O2) is produced as a waste product and the light energy used is stored as chemical energy

Slide3

Investigating Photosynthesis

Jan Van

Helmont

(1643)Carefully massed soil, and tree seedling and watered over 5 years. Determined most of the mass of the tree came from water.

Slide4

Investigating Photosynthesis

Joseph Priestley (1771)

Lit a candle and placed a bell jar over it, watching the flame go out.

Reasoned that there was something in the air necessary to keep the flame going.When a plant was placed under the bell jar, discovered that the candle could be relit after several days.Reasoned that the plant released something into the air necessary for the flame.

Slide5

Investigating Photosynthesis

Jan

Ingenhousz

(1779)Showed the effect observed by Priestley only occurred when plants were exposed to light.

Slide6

Investigating Photosynthesis

Julius Robert Mayer (1845)

Proposed that plants convert light energy into chemical energy

Slide7

Photosynthesis Equation

6 CO

2

+ 6 H2O + light energy  C6H12O6 +

6 O

2

Slide8

Slide9

Stages of Photosynthesis

Capture energy from sunlight

Convert light energy into chemical energy

Use stored chemical energy to produce organic compounds (food) from carbon dioxide

Slide10

1. Capture

energy from sunlight

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1. Capture

energy from sunlight

Pigments (chlorophyll) in the membranes of the thylakoids absorb light energy

Gets transferred to electronsElectrons are replaced from waterH+ ions are leftRemaining O from into O2 gas as waste product

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2. Converting light energy to chemical energy

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2. Converting light energy to chemical energy

Light dependent reactions

Occurs in thylakoid membranes

Use high-energy electrons to produce two high-energy productsConvert ADP into ATPConvert NADP+ into NADPH

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2. Converting light energy to chemical energy

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2. Converting light energy to chemical energy

Electron transport chains (ETC)

A series of molecules through which excited electrons are passed

Energy from the electrons is used to pump H+ ions across the thylakoid membraneA second ETC provides energy to make NADPH, a high energy electron carrier

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2. Converting light energy to chemical energy

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2. Converting light energy to chemical energy

Production of ATP

A concentration gradient is present now for H+ ions

Passing of ions back out of the thylakoid provides energy to make ATP

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2. Converting light energy to chemical energy

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2. Converting light energy to chemical energy

Both

ATP and NADPH are used in the next step

ATP carries necessary energyNADPH carries high-energy electrons

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3. Use stored chemical energy to make food

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3. Use stored chemical energy to make food

Light independent reactions

Calvin Cycle is one example

Occur in stroma inside chloroplasts, but outside of thylakoidsUsing energy from ATP and electrons from NADPH, CO2 is fixed into sugars

Slide22

Investigating Photosynthesis

Melvin Calvin (1948)

received the Nobel prize in chemistry (1961) for discovering pathways that carbon follows to make glucose in photosynthesis

Slide23

Factors that affect Photosynthesis

light intensity

CO

2 concentrationwater levelstemperature


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