Lect.9.Photosynthesis

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

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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 sun’s 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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This note was uploaded on 02/19/2011 for the course BIO 100 taught by Professor S.sanchez during the Spring '10 term at Orange Coast College.

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

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