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absorption acid activity algae amino acids animals atoms auxin bacteria Bibliography carbon cause chemical chlorophyll chloroplasts color common compounds contain crystal cycle density deposits disease effect electric electron elements energy enzyme example factors film flowering fluid formation frequency function fungi growth hormones hydrogen infection ions known layer light magnetic field material measured mechanism membrane ment metabolism metal methods mineral molecules motion occur optical organic oxidation oxygen particles pathogens periderm period permeability Permian petroleum phase phenol phloem phosphate photocathode photoconductivity photographic photosynthesis phototube physical physiological phytochrome piezoelectric pigments plant cells plasma plastic plate pressure produced protein radiation range reaction region relatively reservoir resistance result rocks root seeds sensitivity shown soil solution species spores stem stress structure surface temperature tion tissue tive tube ture types United usually vacuole voltage water potential xylem