Lect.9.Photosynthesis

Lect.9.Photosynthesis - Photosynthesis All life on Earth...

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Unformatted text preview: Photosynthesis All life on Earth depends on a star 93 million miles away Provides photosynthesizers with solar energy Photosynthesis: A process that captures solar energy Transforms solar energy into chemical energy Energy ends up stored in a carbohydrate Photosynthesizers produce all food energy Only 42% of suns energy directed towards Earth reaches surface Of this, only 2% is captured by photosynthesizers Of this, only a tiny portion results in biomass Autotrophs make organic molecules from inorganic raw material 5 Photosynthesis takes place in the green portions of plants Leaf of flowering plant contains mesophyll tissue Cells containing chloroplasts Specialized to carry on photosynthesis CO 2 enters leaf through stomata Diffuses into chloroplasts in mesophyll cells In stroma, CO 2 combined with H 2 O to form C 6 H 12 O 6 (sugar) Photosynthesis 1. Get water from the Roots 2. Capture the sunlight. Chlorophyll in Grana 3. Some energy splits water molecules oxygen is released through Stomata Hydrogen ions are transported to the Stroma (synthesizing ATP energy) 1. Rest of energy excites electrons which are transported to the Stroma NADP accepts electrons and hydrogen ions as NADPH 2 2. Carbon dioxide enters through Stomata combined with Hydrogen in the Stroma to form Sugar (Calvin cycle) Leaves and Photosynthesis Fig. 5.1 Photosynthetic Pigments Pigments: Chemicals that absorb some colors in rainbow more than others Colors least absorbed reflected/transmitted most Absorption Spectra Graph showing relative absorption of the various colors of the rainbow Chlorophyll is green because it absorbs much of the reds and blues of white light Fig. 5.3 Figure 7_04 Fig. 5.6 Table 5.1 Photosynthetic Reactions: Overview divided in 2 1. Light Reaction : Chlorophyll absorbs solar energy (light energy chemical energy) This energizes electrons Electrons move down...
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Lect.9.Photosynthesis - Photosynthesis All life on Earth...

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