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It also helps in the release of oxygen. Leaves are covered with stomas which release oxygen. The stomas work by opening up to let the gases in and out. The cell that controls the stoma is the guard cell. Pair of guard cells gather water and open the stoma. When the guard cells lose water the stoma closes. Oxygen flows out of the stoma when it is open. Also, lenticels are found in the bark and they exchange oxygen and other gases.
In the mesophyll there are spongy materials which hold the air spaces. These air spaces hold the different gases the plant accumulates. From there c02 is diffused in the membrane to be used...
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