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photosynthesis• We will look again at photosynthesis on page 93.• The processes by which light energy is thus harnessed are collectively called photosynthesis.• The secret of the remarkable production by plants of both oxygen and organic food substances is of coursephotosynthesis.• Membranedamage can slow down photosynthesis quite substantially.• One tube is not enough to provide the necessary light energy for photosynthesis.• It is a rawmaterial necessary for photosynthesis.• Plants use carbondioxide in photosynthesis to feed themselves.• Leaves are a richsource of vitaminC and the vitamin is particularly concentrated within chloroplasts, the organelles of photosynthesis.