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Compare And Contrast Respiration And Photosynthesis.

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Introduction

´╗┐By Hirra Naghman 10y Science Essay for Ms Sherrard Due 9th of September 2011 Compare And Contrast Respiration And Photosynthesis. All life depends on two chemical reactions, which are Respiration and Photosynthesis. Respiration and photosynthesis are opposite directions of a reversible reaction. Respiration uses glucose and oxygen to make carbon dioxide and water, which releases energy, whereas photosynthesis absorbs energy to make glucose and oxygen from carbon dioxide and water. In this essay I will be comparing and contrasting the two chemical reactions; respiration and photosynthesis by explaining what the differences and similarities are between them, what things they both apply to and how they are linked to each other. I will start by explaining each process then discussing the similarities and differences in the two reactions, next I will show how respiration and photosynthesis are linked together then finally I will summarise what my essay was about. Photosynthesis is the process that produces ?food? in plants. The ?food? it produces is called glucose. ...read more.

Middle

The result is that during the day when the plant is both respiring and photosynthesising there is a two-way traffic of oxygen and carbon dioxide both into and out of the plant. During the night when the plant is respiring but not photosynthesising, oxygen is being taken in but not given out - and carbon dioxide is being given out but not taken in. Fortunately, plants use up more carbon dioxide in photosynthesis than they produce in respiration, and produce more oxygen while photosynthesising than they use up while respiring - otherwise there would not be enough oxygen in the atmosphere for humans and animals to breathe. Respiration occurs in the cellular organelle, Mitochondria. (Organelle is a membrane-bound structure that is specialised to perform a specific process within a cell.) Mitochondria are structures that come about in large numbers inside muscle cells, where great amounts of energy are needed. The mitochondria hold a large number of different enzymes, which are responsible for different stages of respiration. ...read more.

Conclusion

After this reaction has taken place, the new product leaves the enzyme to be used up again. Another difference between the processes is that photosynthesis only occurs in Autotrophs while respiration takes place in all organisms. The energy transfer in photosynthesis is opposite to that in respiration. As in photosynthesis, the energy transfer is endothermic which means that the reactions that take place take in energy from the surroundings. Where as in respiration, the energy transfer is exothermic; which means the reactions transfer energy to the surroundings, not from. To conclude, respiration is an exothermic reaction, while photosynthesis is an endothermic reaction. Both processes use enzymes and they both require an electron transport chain. One processes? products are the other?s reactants. Respiration breaks down carbohydrates whereas photosynthesis makes them. And last but not least, both life processes are needed in order to keep a plant alive. So even though both processes are similar regarding what they are needed for and their reactants plus products, there are many differences between them. If light is required to photosynthesise, and photosynthesis is required in order for plants to live? Then what about habitats where there is no light? Have a think. ...read more.

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