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1-10 1. What color does chlorophyll reflect? 2. What organisms can make their own energy (there are at least 4 correct answers)? Question of the Day.

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Presentation on theme: "1-10 1. What color does chlorophyll reflect? 2. What organisms can make their own energy (there are at least 4 correct answers)? Question of the Day."— Presentation transcript:

1 What color does chlorophyll reflect? 2. What organisms can make their own energy (there are at least 4 correct answers)? Question of the Day

2 1-10 Photosynthesis uses… Photosynthesis produces… Review Organisms that make their own energy = ??? Organisms that have to eat to get their energy = ??? 3 cellular activities that require energy = …

3 1-10 Photosynthetic pigments … What colors does a plant primarily use for photosynthesis? How do you know? Review

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5 How are heterotrophs and autotrophs different? Question of the Day

6 Why is the sky blue? ure/climate- weather/atmospheric/sky.htm srsky/misr_sky.shtml

7 Photosynthesis Light is absorbed – excites electrons in pigments = start of photosynthesis Light is absorbed – excites electrons in pigments = start of photosynthesis Explain why a leaf appears green Explain why a leaf appears green Because it is absorbing most of the other wavelengths of light and reflecting green Because it is absorbing most of the other wavelengths of light and reflecting green

8 Lets Photosynthesize! It all starts with a…. It all starts with a….

9 Lets Photosynthesize! Calvin cycle 1 st stage 2 nd stage

10 Lets Photosynthesize!

11 LETS PHOTOSYNTHESIZE! Light reactions = first stage of photosynthesis – light energy is converted to chemical energy (energy from the sun ATP + NADPH)

12 The Leaf What organelle in the leaf is responsible for photosynthesis? What organelle in the leaf is responsible for photosynthesis? Chloroplast Chloroplast Parts of a chloroplast Parts of a chloroplast Thylakoids - Flattened sacs where photosynthesis occurs – surrounded by a membrane Thylakoids - Flattened sacs where photosynthesis occurs – surrounded by a membrane Grana – Grana – Stacks of thylakoids Stacks of thylakoids Stroma – Stroma – Solution that surrounds the grana Solution that surrounds the grana

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15 The Light-Dependent Reactions: Generating ATP and NADPH The light-dependent reactions encompass the steps of photosynthesis that directly involve sunlight. The light-dependent reactions encompass the steps of photosynthesis that directly involve sunlight. The light-dependent reactions occur in the thylakoids of chloroplasts. The light-dependent reactions occur in the thylakoids of chloroplasts.

16 Thylakoids contain clusters of chlorophyll and proteins known as photosystems. Thylakoids contain clusters of chlorophyll and proteins known as photosystems. Photosystems absorb sunlight and generate high-energy electrons that are then passed to a series of electron carriers embedded in the thylakoid membrane. Photosystems absorb sunlight and generate high-energy electrons that are then passed to a series of electron carriers embedded in the thylakoid membrane. The Light-Dependent Reactions: Generating ATP and NADPH

17 Chloroplast

18 Light Reactions 1.Occurs on thylakoid membrane 2.Chlorophyll absorbs light and electrons get excited – flow on electron transport chain 3.Energy in excited electrons is used to create NADPH and ATP These are temporary energy carrier molecules These are temporary energy carrier molecules 4.Water – electron donor – releases O 2 5.ATP + NADPH are then used to create glucose in the Calvin Cycle

19 Chlorophyll absorbs light and electrons are excited. These electrons flow on electron transport chain along the thylakoid membrane. As the electron is transported it loses some energy and is used create a H+ concentration gradient inside the thylakoid, which is later used to create ATP from ADP +P. The electron finally reaches the final electron acceptor and is combined with NADP+ and a H+ to form NADPH, which is an energy carrier molecule. Water is split to (2 H 2 O = 4H + + 4e - + O 2 ) to replace the lost electrons. Chlorophyll absorbs light and electrons are excited. These electrons flow on electron transport chain along the thylakoid membrane. As the electron is transported it loses some energy and is used create a H+ concentration gradient inside the thylakoid, which is later used to create ATP from ADP +P. The electron finally reaches the final electron acceptor and is combined with NADP+ and a H+ to form NADPH, which is an energy carrier molecule. Water is split to (2 H 2 O = 4H + + 4e - + O 2 ) to replace the lost electrons.

20 One of the most important steps (water molecules split): 2 H 2 O = 4H + + 4e - + O 2 Light Reactions protons electrons oxygen

21 1. During the light reactions ___ and ___ are used to make ___, ___, and ___. REVIEW

22 DRAW! Also label: thylakoid grana stroma

23 During the light reactions ___ and ___ are used to make ___, ___, and ___. Question of the Day

24 One of the most important steps (water molecules split): 2 H 2 O = 4H + + 4e - + O 2 Light Reactions protons electrons oxygen

25 Light Reactions

26 1-13 Quiz up to and including the light reactions (notes pages 1-7) on Wednesday 1-19 Announcement

27 How are heterotrophs and autotrophs different? REVIEW 2. Photosynthetic pigments … 3. What colors does a plant primarily use for photosynthesis? How do you know?

28 Photosynthesis uses… Photosynthesis produces… Review 5. Where do the light reactions take place? 6. Why is the splitting of water molecules important for photosynthesis?

29 1-13 Review 7. The light rxns use… To produce… 8. Whats the electron transport chain?

30 QUICK TALK Light Reactions Glucose Chloroplast Autotroph Chlorophyll Chemosynthetic bacteria Thylakoid Carbon dioxide Photosynthesis Producer Stroma Heterotroph NADPH


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