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Photosynthesis Light Absorption Sun gives off visible light (ROYGBIV) Unabsorbed light reflects to our eyes –Most green light not absorbed by leaves.

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Presentation on theme: "Photosynthesis Light Absorption Sun gives off visible light (ROYGBIV) Unabsorbed light reflects to our eyes –Most green light not absorbed by leaves."— Presentation transcript:

1

2 Photosynthesis

3 Light Absorption Sun gives off visible light (ROYGBIV) Unabsorbed light reflects to our eyes –Most green light not absorbed by leaves Chlorophyll absorbs sunlight –Absorb mostly reds and blues

4 White light Prism

5 Which color(s) are being reflected? Yellow Which color(s) are being absorbed? Red, Orange, Green, Blue, Indigo, Violet

6 Which color(s) are being reflected? Blue Which color(s) are being absorbed? Red, Orange, Yellow, Green, Indigo, Violet

7 Which color(s) are being reflected? None…Black is the absence of light Which color(s) are being absorbed? All….ROYGBIV

8 Which color(s) are being reflected? All…ROYGBIV Which color(s) are being absorbed? None

9 Which color(s) are being reflected? Green Which color(s) are being absorbed? Red, Orange, Yellow, Blue, Indigo, Violet

10 The Chloroplast Site of photosynthesis Thylakoid membranes: light dependent reactions Stroma (fluid interior): light independent reactions

11 Stomata: pore underneath leaves through which gases enter/exit

12 Photosynthesis Overview Two Stages 1) Light Dependent Reactions –Photosystems: groups of molecules that capture/transfer energy –Creates: O 2, ATP, NADPH 2) Light Independent Reactions –Creates: Glucose

13 Light Dependent Reactions: Photosystem II Step 1: Chlorophyll absorbs sunlight –Chlorophyll e - become excited & transfer to thylakoid membrane ›Thylakoid membrane becomes negatively charged –Starts an electron transport chain

14 Step 2 & 3: H 2 O broken into H +, e -, and O ›e - replace those lost by chlorophyll ›O waste ›H + pumped inside the thylakoids and accumulate

15 e e e e e e ee e e e Thylakoid membrane Thylakoid membrane becomes negatively charged chlorophyll e e ee H H O H H O H H O Oxygen waste is released Electrons replace those which left chlorophyll

16 e e e e e e ee e e e Thylakoid membrane Thylakoid membrane becomes negatively charged chlorophyll e e ee Oxygen waste is released Electrons replace those which left chlorophyll H H H H H H e e e e e e e e e e e e e e e The process keeps repeating The plants takes in water H H O H O H H O H

17 Light Dependent Reactions: Photosystem I Chlorophyll absorbs sunlight –Chlorophyll e-e- become excited & transfer to thylakoid membrane ›Accumulate with those from photosystem II e-

18 NADPH produced (H taxi) ›e - causes H + to bond with NADP ›NADPH will be used later ATP produced ›H + ions diffuse and bond ADP with P i ›ATP will be used later H+ ATP e- ATP

19 Light Dependent Summary O 2, ATP, NADPH created NO GLUCOSE CREATED!

20 Light Independent Reactions (Calvin Cycle) Step 1: CO 2 bonds with RuBP (5C) molecule to make a 6C molecule

21 CO2CO2 6C molecule CCCCCCCCCCC RuBP CO2 bonds with RuBP Six carbon molecule is created

22 Step 2: 6C molecule splits into two PGAL molecules (3C) »ATP & NADPH provide the energy

23 CCCCCC 6C molecule ATP ADP ATP ADP NADPH NADPH (from light dependent cycle) drops off H NADPH H HH H H H ATP (from light dependent cycle) provides energy to break the molecule into PGAL CCCCCC PGAL PGAL ADP ATP

24 Step 3: Some PGAL (3C) bonds to make glucose (6C) Some PGAL recycled to start the cycle over

25 PGALPGAL PGALPGAL PGALPGAL PGALPGAL PGALPGAL PGALPGAL PGALPGAL glucose! PGAL bonds with PGAL….to make glucose! CC CC CC C CC CC C Glucose is used by plant cell mitochondria to create ATP in the process of cellular respiration PGAL is used to restart the Calvin Cycle

26 Step 4: PGAL (3C) bonds to remake a RuBP (5C) molecule with help of ATP CO 2 bonds with RuBP (5C) to restart the cycle

27 PGAL broken apart by ATP CCC CCC CCC CCC CCC ATP

28 Unstable C atoms recombine to make RuBP (5C) molecules RuBP molecules bond with CO2 again C C C C C C C C C C C C C C C CCCCC CCCCC CCCCC RuBP CO2CO2 CO2CO2 CO2CO2 6C molecule CCCCCC CCCCCC CCCCCC

29

30 CO 2, ATP, & NADPH create glucose Light Independent Summary

31 Your essay question on the next test! Trace the flow of energy, including ATP, from the sun to your muscles, after eating a green leaf salad.

32 Kobe Kuiz Place these steps in order from start to finish: A) Electron transport chain creates NADPH and ATP energy B) 3C molecule broken by ATP into 5C molecule C) PGAL created when 6C molecule broken down D) Water broken into H+, e-, and O components E) Sunlight causes chlorophyll electrons to flow into thylakoid membrane F) 3C molecule bonds to create glucose G) CO2 bonds with RuBP

33 Kobe Kuiz Place these steps in order from start to finish: E) Sunlight causes chlorophyll electrons to flow into thylakoid membrane D) Water broken into H+, e-, and O components A) Electron transport chain creates NADPH and ATP energy G) CO2 bonds with RuBP C) PGAL created when 6C molecule broken down F) 3C molecule bonds to create glucose B) 3C molecule broken by ATP into 5C molecule


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