6II. Location of Photosynthesis Which tissues contain chloroplasts?
7Other Important Parts Xylem: transports H2O Stoma: pore that allows gases to enter and exit
8III. CHLOROPLAST STRUCTURE Double-membrane structureInternal Organization1. Thylakoids:a. These have clusters of chlorophyll and other pigments2. Stroma: Fluid surrounding thylakoids
9IV. Light & PigmentsA. Sunlight is “white” but contains mixtures of visible wavelengthsB. Plants gather sun’s energy using light-absorbing molecules called PIGMENTS
10V. Plant Pigments MAJOR MINOR Chlorophyll a Chlorophyll b Xanthophyll Absorbs all colors of lightexcept greenPlays major role in lightreactions of photosynthesisChlorophyll bYellow-greenXanthophyllIn carotenoid familyYellowCaroteneRed & orange pigmentsMAJORMINOR
11B. Visible energy spanswavelengths of approx.nmC. It is part of theelectromagnetic spectrum
12Green is NOT absorbed!Plant pigments absorb different wavelengths of energy- which wavelength is the LEAST absorbed?
131. Leaves absorb blue-violet & red-orange light very well 2 1. Leaves absorb blue-violet & red-orange light very well 2. Green light is REFLECTED which is why plants look green!
14VI. PHOTOSYNTHESIS Inputs: Light, carbon dioxide, & water Outputs: sugar and oxygen
15VI. Photosynthesis Has Two Parts: Light ReactionCalvin Cycle
16VII. Light Reaction Chlorophyll capture light energy in chloroplast This splits H2O into oxygen and hydrogenOxygen is a "waste product" & escapes to the atmosphereEnergy from the reaction is used in the next stage.
17B. ATP and NADP are recycled back into the systemC. Light reaction is charging up the“battery” needed to makesugars in Calvin Cycle
18IX. Calvin Cycle Does NOT use light at all Uses energy from Light Cycle to convert CO2 into glucose