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stomate transpiration gas exchange 3 Photosynthesis Overview Energy for all life on Earth ultimately comes from photosynthesis. 6CO 2 + 12H 2 O C 6.

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Presentation on theme: "stomate transpiration gas exchange 3 Photosynthesis Overview Energy for all life on Earth ultimately comes from photosynthesis. 6CO 2 + 12H 2 O C 6."— Presentation transcript:

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2 stomate transpiration gas exchange

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4 3 Photosynthesis Overview Energy for all life on Earth ultimately comes from photosynthesis. 6CO H 2 O C 6 H 12 O 6 + 6H 2 O + 6O 2 Photosynthesis is carried out by: Cyanobacteria,Some protists,+ Land plants

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6 Chloroplasts – double membrane – stroma fluid-filled interior – thylakoid sacs – grana stacks Thylakoid membrane contains – chlorophyll molecules – electron transport chain – ATP synthase H + gradient built up within thylakoid sac H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ outer membrane inner membrane thylakoid granum stroma thylakoid chloroplast ATP

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8 7 Pigments Pigments: molecules that absorb visible light Each pigment has a characteristic absorption spectrum, the range it is capable of absorbing. --chlorophyll a – primary pigment --chlorophyll b – secondary pigment -- carotenoids – accessory pigments

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10 Two stages of photosynthesis: 1.Light-dependent reactions Requires light as a source of energy Step 1: chlorophyll uses energy from sun to split water molecules Step 2: water molecules split into H & O Step 3: O 2 released to atmosphere Step 4: chlorophyll stores some light energy in ATP

11 Photo phosphoryl ation A process Adding a phospate group Using light

12 Light Reactions O2O2 H2OH2O Energy Building Reactions ATP  produces ATP  produces NADPH  releases O 2 as a waste product sunlight H2OH2O ATP O2O2 light energy  +++ NADPH

13 Thylakoid Structure

14 Non-cyclic

15 2.Light-Independent reactions (Calvin Cycle) Part of photosynthesis that doesn’t require light Step 1: hydrogen which split from H 2 O combines with CO 2 using energy stored in ATP Step 2: this combination forms glucose (C 6 H 12 O 6 ) Step 3: water is formed (byproduct)

16 Making Sugar The energy captured in the Lt-Dep is now used to fix CO 2 and make sugar.

17 Calvin Cycle sugars CO 2 Sugar Building Reactions ADP  builds sugars  uses ATP & NADPH  recycles ADP & NADP  back to make more ATP & NADPH ATP NADPH NADP CO 2 C 6 H 12 O 6  +++ NADPATP + NADPHADP

18 Putting it all together CO 2 H2OH2OC 6 H 12 O 6 O2O2 light energy  +++ Sugar Building Reactions Energy Building Reactions Plants make both:  energy  ATP & NADPH  sugars sunlight O2O2 H2OH2O sugars CO 2 ADP ATP NADPH NADP

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20 *respiration occurs in plant cells also, when they need to release the energy stored in glucose

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22 H2OH2O Energy cycle Photosynthesis Cellular Respiration sun glucose O2O2 CO 2 plants animals, plants ATP The Great Circle of Life,Mufasa! CO 2 H2OH2O C 6 H 12 O 6 O2O2 light energy  +++ even though this equation is a bit of a lie … it makes a better story CO 2 H2OH2O C 6 H 12 O 6 O2O2 ATP energy  +++

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