Science

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1. 
   clane Teacher
   High School - 10th Grade

   The biggest difference between photosynthesis and respiration is that photosynthesis only occurs in plants and some bacteria while respiration occurs in all living organisms. They do share one big similarity and that is that the process of photosynthesis is actually the same process only it is completed in reverse.

   Photosynthesis is Carbon Dioxide and Water that, through the process, yield Glucose and Oxygen.

   Respiration is Glucose and Oxygen that, through the process of respiration, yield Carbon Dioxide and Water.

   The two work well together because living organisms supply plants and some bacteria with the carbon dioxide needed to undergo photosynthesis, and plants and some bacteria give off oxygen which living organisms need to breathe or respire.

   Sources:

   http://www.enotes.com/britannica-encyclopedia/photosynthesis

   http://www.enotes.com/britannica-encyclopedia/respiration

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   Posted by clane on Monday April 7, 2008 at 6:44 PM
   
   

2. 
   psk Teacher
   College - Junior

   Introduction: 

   Photosynthesis: is a biological process in which green plant cells(mainly) form their food in presence of light, and during this process oxygen gas is evolved.this is reduction reaction.

   Respiration: is a biological process in which living organism inhale(take) oxygen from atmosphere and in cell this oxygen is used for oxidation of food to produce energy,carbon di oxide is evolved through this mechanism.

        process of photosynthesis

   Photosynthesis takes place primarily in plant leaves, and little to none occurs in stems, etc. The parts of a typical leaf include the upper and lower epidermis, the mesophyll, the vascular bundle(s) (veins), and the stomates. The upper and lower epidermal cells do not have chloroplasts, thus photosynthesis does not occur there. They serve primarily as protection for the rest of the leaf. The stomates are holes which occur primarily in the lower epidermis and are for air exchange: they let CO2 in and O2 out. The vascular bundles or veins in a leaf are part of the plant's transportation system, moving water and nutrients around the plant as needed. The mesophyll cells have chloroplasts and this is where photosynthesis occurs .The overall chemical reaction involved in photosynthesis is: 6CO2 + 6H2O (+ light energy) C6H12O6 + 6O2. This is the source of the O2 we breathe, and thus, a significant factor in the concerns about deforestation.

   Sources:

   http://biology.clc.uc.edu/Courses/bio104/photosyn.htm

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   Posted by psk on Tuesday June 3, 2008 at 4:36 AM
   
   

3. 
   mvball Teacher
   College - Sophomore

   This question deserves  several "answers" aimed at different levels.

   For elementary-school students, it is important to know that photosynthesis is how green plant cells trap sunlight to make sugar, and respiration is how all plant cells (and most other cells) break sugar down to release and use that stored energy.

   At the high school level, we can add the understanding that all cells break down fuel molecules but only certain cells can use sun energy to create fuel molecules.  Also, although the summary equations are sort of "the reverse of each other", the processes are not just "the same but completed in reverse", but involve enzymes and chemical reactions that are specific to the process of either photosynthesis or respiration. 

   In terms of ecological implications of deforestation as they relate to photosynthesis, it is not the lack of oxygen production that concerns us, because marine algae release much more oxygen per year than trees do.  Our concern is that a lot of carbon, stored in wood, is released as carbon dioxide when wood is burned, adding to the impact of "greenhouse gases" on global average temperature.

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   Posted by mvball on Monday September 8, 2008 at 12:13 AM
   
   

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