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1.Oxygen through the process of photolysis
photolysis occur during the day, in this process water molecule is split by light through the equation
2H20+4H+ +4e-+o2 and oxygen is given off through this process, it occurs mostly in the light stage of photosynthesis
2.carbon dioxide through the process of respiration in plants. Mostly at night, plants take in oxygen and give out carbon dioxide just like animals

The two vital gases that are exchanged between leaf tissues and the outside environment are; Oxygen and Carbon dioxide.

     

     When leaf tissues exchange gases with the environment, they do so through their pores called Stomata    

   

      In plants, gas exchange is defined as the process where oxygen and water vapor leave a plants' leaves while carbon dioxide enters. Now, creating a gaseous balance here is not quite straightforward because plant cells undergo respiration and photosynthesis.

     Now, respiration in Plants is similar to that of animals whereby oxygen is used to oxidize carbohydrates while carbon dioxide and water are the waste products of this oxidation of carbohydrates.  

      When plants undergo photosynthesis, the process involves the input of carbon dioxide and water as they are both used in the production of carbohydrates while in this case oxygen is is now the waste.

      In conclusion, from the statements above, the two vital gases that are exchanged between leaf tissues and the outside environment. are Oxygen and Carbon dioxide.

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