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4.2 Overview of Photosynthesis Video Eyewitness Plant Watch video and answer the questions.

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Presentation on theme: "4.2 Overview of Photosynthesis Video Eyewitness Plant Watch video and answer the questions."— Presentation transcript:

1 4.2 Overview of Photosynthesis Video Eyewitness Plant Watch video and answer the questions

2 4.2 Overview of Photosynthesis Set up Cornell Notes on pg. 41 Topic: 4.2/4.3 Intro to Photosynthesis Essential Question: What are the roles of chloroplasts and chlorophyll in photosynthesis? 2.1 Atoms, Ions, and Molecules What are the roles of chloroplasts and chlorophyll in photosynthesis? 4.2/4.3 Intro to Photosynthesis Key Concept: The overall process of photosynthesis produces sugars that store chemical energy

3 4.2 Overview of Photosynthesis CA Standard 1.The fundamental life processes of plants and animals depend on a variety of chemical reactions that occur in specialized areas of the organism’s cells. 1.F Know usable energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide.

4 4.2 Overview of Photosynthesis Imagine you just planted beautiful roses in your garden. What materials are crucial to the roses’ survival? In other words, what do the roses need to stay alive? Discussion QuestionsPg. 40

5 4.2 Overview of Photosynthesis What materials are crucial to the roses survival? In other words, what do the roses need to stay alive? Water (H 2 0) Sunlight Carbon Dioxide (CO 2 ) Soil

6 4.2 Overview of Photosynthesis KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.

7 4.2 Overview of Photosynthesis List a few things that use energy from sunlight. Pg. 40

8 4.2 Overview of Photosynthesis Solar powered homes, cars, and calculators are just a few things that use energy from sunlight. In a way you are solar powered. Although the sun does not directly give you the energy.

9 4.2 Overview of Photosynthesis How do we, as humans, get our chemical energy?

10 4.2 Overview of Photosynthesis How do we, as humans, get our chemical energy? photosynthesis: Stores energy from sunlight in glucose cellular respiration: breaks down glucose to release stored energy in the form of ATP Pg. 40

11 4.2 Overview of Photosynthesis Photosynthesis is a process that captures energy from sunlight to make sugars that store chemical energy. Therefore, directly or indirectly, the energy for almost all organisms begins as sunlight. (Sugar) Products Reactants

12 4.2 Overview of Photosynthesis Photosynthetic organisms are producers. Producers make their own source of chemical energy (they make their own food). Ex: Plants

13 4.2 Overview of Photosynthesis Video Discovery of Photosynthesis

14 4.2 Overview of Photosynthesis They contain Chlorophyll, which is a molecule that absorbs light energy. chloroplastleaf cell leaf Chloroplasts are organelles where photosynthesis occurs

15 4.2 Overview of Photosynthesis –Thylakoid -Coin-shaped compartments that contain chlorophyll -Grana- stacks of thylakoids –Stroma -Fluid that surrounds the grana chloroplast stroma granam Thylakoid

16 4.2 Overview of Photosynthesis Label this Chloroplast Contains: Reactants Products

17 4.2 Overview of Photosynthesis 10. granum (stack of thylakoids) 1.chloroplast 2. sunlight 3. 6H 2 O 7. 6CO 2 thylakoid 6. energy 5. 6O 2 stroma (fluid outside the thylakoids) 9. 1 six-carbon sugar C 6 H 12 O 6 8. Calvin Cycle 4. Thylakoid Contains: chlorophyll Reactants Products

18 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 granum (stack of thylakoids) thylakoid sunlight 1 six-carbon sugar 6H 2 O 6CO 2 6O 2 chloroplast energy stroma (fluid outside the thylakoids) Carbon dioxide water light, enzymes a sugar oxygen

19 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 How many Cs?

20 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 How many Cs?

21 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 How many Cs? How many Os?

22 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 How many Cs? How many Os?

23 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 How many Cs? How many O 2 s? How many Hs?

24 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 How many Cs? How many Os? How many Hs?

25 4.2 Overview of Photosynthesis The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 granum (stack of thylakoids) thylakoid sunlight 1 six-carbon sugar 6H 2 O 6CO 2 6O 2 chloroplast energy stroma (fluid outside the thylakoids) Carbon dioxide water light, enzymes a sugar oxygen

26 4.2 Overview of Photosynthesis Video The Process of Photosynthesis

27 4.2 Overview of Photosynthesis Set up Cornell Notes on pg. 43 Topic: 4.2/4.3 Light Dependent Reactions Essential Question: How do the two photosystems work together to capture energy from sunlight? 2.1 Atoms, Ions, and Molecules How do the two photosystems work together to capture energy from sunlight? 4.2/4.3 Photosynthesis: Light Dependent Reactions Key Concept: Photosynthesis requires a series of chemical reactions

28 4.2 Overview of Photosynthesis Sponge What are the reactants and products of photosynthesis?

29 4.2 Overview of Photosynthesis Reactants: (What do we need for photosynthesis? Sunlight H 2 O water CO 2 carbon dioxide Products: O 2 oxygen Glucose (sugar) The equation for photosynthesis is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2

30 4.2 Overview of Photosynthesis Light- de pendent reactions capture energy from sunlight (The reactions depend on light!).

31 4.2 Overview of Photosynthesis

32 Light Dependent reactions- take place in the thylakoids Sunlight is absorbed by chlorophyll 6 H 2 O (water) molecules are broken down H+, e-, O 2 6 O2 (oxygen) are released as waste The energy is carried by ATP and NADPH molecules to fuel the light independent reactions LIGHT DEPENDENT IN A NUTSHELL

33 4.2 Overview of Photosynthesis Classwork On pg. 42: –Make a flow map which includes the reactants and products of light dependent reactions –All 7 parts of Light-Dependent Reactions –Label Photosystem II and Photosystem I

34 4.2 Overview of Photosynthesis REACTANTS PRODUCTS 1. Name LIGHT –DEPENDENT REACTIONS Pg in book Pg. 42 INB

35 1. Chlorophyll absorbs energy from sunlight The energy is transferred to electrons (e-) in the chlorophyll These high energy electrons enter an Electron Transport Chain Photosystem II

36 2. Water molecules split: Oxygen released as waste Hydrogen Hydrogen ions (H+) Electrons (e-) The electrons from the water replace the electrons lost from the chlorophyll in step 1

37 3. Electrons move from protein to protein in the ETC Their energy is used to pump the (H+) inside the thylakoid (against the concentration gradient) H+ build up inside the thylakoid

38 Photosystem I 4. Absorb energy from sunlight Electrons are energized and leave the chlorophyll The e- on the ETC in Photosystem II will replace the e- lost in step 4

39 5. The energized electrons are added to a molecule called NADP+ (like ADP)

40 5. The energized electrons are added to a molecule called NADP+ (like ADP) A molecule of NADPH (like ATP) is made NADPH will continue to the Light-Independent reactions

41 6. H+ ions have built up inside the thylakoid from Photosystem II (more inside than outside) H+ flow though a protein channel through diffusion

42 7. As H+ flow though the protein channel… ATP synthase makes ATP by adding phosphates to ADP ATP will move on to the Light- Independent Reactions

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44

45 4.2 Overview of Photosynthesis REACTANTS 2. Water molecules split: H+, Electrons, and O 2 3. Electrons move through the ETC- Hydrogen ions (H+) transported inside thylakoid 4. Chlorophyll absorbs more energy from sunlight. Electrons leave to the ETC 5.Electrons added to NADP+ to make NADPH 6. Hydrogen Ions diffuse out of the thylakoid through a protein channel 7. As H+ ions flow through the protein channel, ATP is made PRODUCTS 1. Energy is absorbed from sunlight by chlorophyll- Electrons enter E.T.C. Oxygen Released as waste Photosystem II Photosystem I NADPH ATP H2OH2O LIGHT -DEPENDENT REACTIONS Sunlight

46 4.2 Overview of Photosynthesis Light-Dependent Reactions Order Game In pairs, put the Light-Dependent Reactions in order 1 st 3 groups: Gets a treat!!!! Please close notebooks…..

47 4.2 Overview of Photosynthesis Video Light Dependent Reactions

48 4.2 Overview of Photosynthesis Set up Cornell Notes on pg. 45 Topic: 4.2/4.3 Photosynthesis: Light Independent Reactions Essential Question: Explain the relationship between light-dependent and the light-independent reactions. 2.1 Atoms, Ions, and Molecules Explain the relationship between light-dependent and the light-independent reactions. 4.2/4.3 Photosynthesis: Light Independent Reactions

49 4.2 Overview of Photosynthesis –The energy from both NADPH and ATP is used to make sugars during light- independent reactions. Light-Dependent Reactions

50 4.2 Overview of Photosynthesis The light- in dependent reactions use energy from light- dependent reactions to make sugars. –takes place in the stroma – needs 6 CO2 (Carbon Dioxide) from atmosphere – uses light-Dependent ATP/NADPH (energy) to build a sugar molecule which stores some of the energy that was captured from sunlight LIGHT INDEPENDENT IN A NUTSHELL

51 4.2 Overview of Photosynthesis Calvin Cycle

52 4.2 Overview of Photosynthesis The energy from the light dependent reactions is used for a series of reactions called the Calvin Cycle. Calvin Cycle: uses carbon dioxide CO 2 gas from the atmosphere and the energy carried by ATP and NADPH to make simple sugars. 1 6-carbon sugar made

53 4.2 Overview of Photosynthesis CO25-carbon molecule –1. a CO2 molecule is added to a 5-carbon molecule already in the Calvin Cycle. 6-carbon molecule –A 6-carbon molecule is formed 1. +

54 4.2 Overview of Photosynthesis ATPNADPH –2. ATP and NADPH are used to split the six-carbon molecules 3-Carbon molecules –Two 3-Carbon molecules are formed 2. +

55 4.2 Overview of Photosynthesis –3. Most of the 3-Carbon molecules stay in the Calvin Cycle 3-Carbon molecule –One high energy 3-Carbon molecule leaves the cycle for every 3 CO2 molecules that enter the cycle (3 turns) 6- Carbon sugar molecule –After two leave (6 turns), they bond together, forming a 6- Carbon sugar molecule 3. + This one has been waiting…

56 4.2 Overview of Photosynthesis ATP 3-carbon molecules 5-carbon molecules –4. Energy from ATP is used to change the remaining 3-carbon molecules back into 5-carbon molecules CO2 –These will be added to CO2 and the cycle continues… 3. + This one has been waiting…

57 4.2 Overview of Photosynthesis Calvin Cycle Draw/label on pg. 44

58 4.2 Overview of Photosynthesis Video Calvin Cycle

59 4.2 Overview of Photosynthesis

60 Light-dependent reactions capture energy from sunlight and produces oxygen as a byproduct. Light-independent reactions use energy from the light- dependent reactions to make sugars. ATP NADPH

61 4.2 Overview of Photosynthesis Video Photosynthesis in Detail

62 4.2 Overview of Photosynthesis Key: Glucose (sugar) Light Dependent Light Independent Sunlight Thylakoid Chloroplast Calvin Cycle H2O CO2 O2 Stroma Photosystem I Photosystem ll ….Reactants….. ….Products…..

63 4.2 Overview of Photosynthesis ….Reactants….. ….Products….. Light Dependent Light Independent Glucose Sunlight Thylakoid Chloroplast Calvin Cycle H2O CO2 O2 Stroma Photosystem ll Photosystem I


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