Transcription of CHAPTER 13
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CHAPTER 13
206 BIOLOGYAll 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. It is also responsible for the release of oxygen into theatmosphere by green plants . Have you ever thought what would happenif there were no oxygen to breath? This CHAPTER focusses on the structureof the photosynthetic machinery and the various reactions that transformlight energy into chemical DO WE KNOW?
210 BIOLOGY 13.4 HOW MANY PIGMENTS ARE INVOLVED IN PHOTOSYNTHESIS? Looking at plants have you ever wondered why and how there are so many shades of green in their leaves – even in the same plant? We can
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