recall the origin of carbon dioxide and oxygen as waste products of metabolism and their loss from the stomata of a leaf
-photosynthesis: absorbing light energy and in the process of doing so it combines (CO2) carbon dioxide and water (H2O) to form glucose (C6H12O6) and gives of the gas (O2) oxygen- waste molecule example of excretion which is the release of metabolic waste.
-process of respiration: glucose (C6H12O6) + O2 (oxygen) --enzyme reaction-----> ATP (produced in the process) + CO2 (waste molecules also excretion) + H2O.
-plants excrete O2 (oxygen) or CO2 (carbon dioxide) depending on whether they are doing photosynthesis or respiration.
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