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Plant bio

Photosynthesis

QuestionAnswer
What is photosynthesis? Light dependent assimilation of CO2
Where does it occur globally? ie. N. Atlantic spring bloom El nino Pacific phytoplankton bloom (equator)
Energy of light Irradiance: mass solar output, energy at earth's surface Energy of light: E= hv h = Planck’s constant v = frequency = c/λ
Light in forests - canopy top: 400nm plus - beneath canopy: 700nm into far red
Why are leaves green? - reflected light - chlorophyll absorbs red and blue mostly
How is the energy of light absorbed used? - higher excited state from blue light absorption - lower excited state from red light absorption and heat loss - red flourescence from this lower energy state
How is energy conserved? Energy is transferred between pigments to a reaction center where electron transfer occurs, and ultimately to chlorophyll by FRET
What is the enhancement effect? - synergy between red and far red irradiation explained by photosystems I and II - both contain chlorophyll pigments - I absorbs longer wavelengths, II absorbs shorter wavelengths
Z scheme of electron transport - light-dependent transfer of e- from water to NADP+ - Movement of electrons is coupled to transfer of protons across thylakoid membrane – stroma to lumen - generates H+ gradient that is dissipated by F1-ATPase, producing ATP
Created by: reub8n
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