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CHAPTER 13

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206BIOLOGYAll animals including human beings depend on plants for their food. Haveyou ever wondered from where plants get their food? Green plants, infact, have to make or rather synthesise the food they need and all otherorganisms depend on them for their needs. Green plants carry out photosynthesis , a physico-chemical process by which they use lightenergy to drive the synthesis of organic compounds. Ultimately, all livingforms on earth depend on sunlight for energy. The use of energy fromsunlight by plants doing photosynthesis is the basis of life on is important due to two reasons: it is the primary sourceof all food on earth.

PHOTOSYNTHESIS IN HIGHER P LANTS 207 Another experiment you may have carried out is the half-leaf experiment, where a part of a leaf is enclosed in a test tube containing some KOH soaked

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