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www.GOALias.blogspot.comBesides leaves, photosynthesis also takes place in other green parts of theplant — in green stems and green branches. The desert plants have scale- orspine-like leaves to reduce loss of water by transpiration. These plants havegreen stems which carry out photosynthesis.of all living organisms is producedduring photosynthesis. In the absenceof photosynthesis, life would beimpossible on the earth.During photosynthesis, chlorophyllcontaining cells of leaves (Fig. 1.2), inthe presence of sunlight, use carbondioxide and water to synthesisecarbohydrates (Fig. 1.3). The processcan be represented as an equation:Carbon dioxideCarbohydratewateroxygenChlorophyllsunlightchlorophyllCarbondioxideOxygenLight energyChlorophyllin leafFig. 1.3 Schematic diagram showingphotosynthesisWater andmineralsDuring the process oxygen isreleased. The carbohydrates ultimatelyget converted into starch. The presenceof starch in leaves indicates theoccurrence of photosynthesis. Thestarch is also a carbohydrate.(a) LeafGuard cell Stoma(b) A section through a leafGuard cellsBoojho has observed someplants with deep red, violet orbrown leaves. He wants toknow whether these leavesalso carry out photosynthesis.Stomatal opening(c) StomataFig. 1.2Activity 1.1Take two potted plants of the same kind.Keep one in the dark (or in a black box)for 72 hours and the other in theNUTRITIONIN PLANTS3