Cloroplastos

Monday, March 21, 2011

     Muitos tipos de células vegetais apresentam corpúsculos verdes em forma de lentilha, onde fica a clorofila: os cloroplastos. Uma única célula pode conter dezenas deles no citoplasma.
Observe no esquema, em corte, de uma célula vegetal os cloroplastos (http://1.bp.blogspot.com/_lW7qAQFawjs/RmgGf5ADdBI/AAAAAAAAACM/dIeuKHMhaag/s400/celula%5B2%5D.gif)
     É no interior dos cloroplastos que ocorre a fotossíntese, por isso ali devem chegar a luz, a água (H2O), e o gás carbônico (CO2). A glicose (C6H12O6) produzida, dissolvida em água, sai das células e é transportada pelos vasos, como componente da seiva elaborada, indo das folhas para outros órgãos da planta.

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