Photosynthesis Johannes van Helmont, 1643 Willow Tree - 169 lbs 5 lbs 200 lbs CQ 1: Where did most of the actual weight (biomass) gained by the tree comes from? Organic material in soil are taken up by plant roots. Carbon dioxide in the air that enters through leaves. Minerals dissolved in water taken up by plant roots. Energy from the sun captured by leaves. Carbon from decomposed leaf litter in the soil. Photosynthesis: 2 reactions 1. 2. Sunlight = Energy Composed of different wavelengths Chloroplasts Chlorophyll Chlorophyll Light Reaction Electron Transport Chain (ETC) ATP synthase Light Reaction Some energy captured as electrons. NADP + e- carrier - - e- from photosystems H + - NADP + - H + H + - NADP + - Light Reaction Light Independent Reaction sugars O2 CO2 both 1 and 2 1, 2, and 3 CQ 2: What do plants produce during photosynthesis used by humans and other animals? Photosynthesis Summary: Plants, algae, and some bacteria Solar Energy Source of all food and O2 Reactants (Energy poor) CO2 + H2O Products (Energy rich) C6H12O6 + O2 Photosynthesis H2O + CO2 Organic Matter C6H12O6 + O2 Cell Respiration Experiment Discuss with your groups and predict the biomass of the plant material in the various treatments. Sun Water Sun Water #1 #2 #3 Seeds 2g Seeds 2g Seeds 2g Sun Water Sun Water Seeds were treated as listed for 1 week, then dried & weighed. Initial weight = CQ 3: How much would you expect the seeds to weigh after treatment #3? >2g b. <2g c. 2g #1 #2 #3 Seeds 2g Seeds 2g Seeds 2g Sun Water Sun Water Seeds were treated as listed for 1 week, then dried & weighed. Initial weight = CQ 4: How much would you expect the seeds to weigh after treatment #2? >2g b. <2g c. 2g
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