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All green plants are autotrophic and photosynthetic.Autotrophic means production of organic food substances from simple inorganic substances like water and carbon dioxide. If this process takes place by using sunlight energy it is called photosynthesis.Plants possess chlorophyl which is green pigment that absorbs light in blue and red regions of spectrum.Chlophyll is present in thylakoid membranes of grana in chloroplast of plant cell.It traps light energy to produce glucose fromCO2 and H2O.Normal plants cant eat food thus they light to prepare food for themselves and for animals.

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