Photosynthesis (cont) - pigment = a compound that absorbs light - different colors absorb different colors of light
Photosynthesis (cont) - chlorophyll = a molecule in chloroplasts that absorbs visible light - two types: chlorophyll a (primary pigment) chlorophyll b (accessory pigment) - absorb mostly red and blue light - neither a nor b absorbs green light (this is why plants appear green – color is reflected)
Photosynthesis (cont) - carotenoids (accessory pigments) – contain yellow, orange, red, brown pigments - in plants, chlorophylls are much more abundant than other pigments - in fall, plants lose their chlorophylls (carotenoids then become visible)
Light Reactions - capture energy in sunlight and transfer it - take place in thylakoid membrane of a chloroplast - chlorophyll absorbs energy from sunlight - water is broken down (into H+ ions, electrons, and oxygen)
Light Reactions (cont) - oxygen is released as a waste product - NADPH is formed (functions like ATP = energy) when electrons are added to NADP+ - energy is transferred to make ATP (when H+ ions diffuse) - overall, oxygen is given off as a waste product, NADPH and ATP are formed
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