Yes. As well as the process of photosynthesis, plants also engage in a process called cellular respiration. While photosynthesis uses carbon dioxide to make sugar, and releases oxygen as a byproduct, cellular respiration uses oxygen and releases carbon dioxide as a byproduct. The good news is, plants absorb much more carbon dioxide than they release, so overall, they are beneficial.
Plants also release carbon dioxide into the atmosphere when burned. In fact, a forest fire can turn a forest from a carbon sink to a carbon emitter for a few decades. However, the forest, once it recuperates fully, will eventually grow to be a sink again. Also, there will probably never be an instance of plant carbon emissions being anywhere near comparable to what is released when fossil fuels are burned.
Trees also tend to release more carbon dioxide at night while they consume oxygen.
Looking at the chemical equations for photosythesis and respiration shows that in general plants use the same amount of CO2 as a reactant and a product. Thus the two process efficiently use their products to benefit each other.
Photosynthesis: 6CO2 (carbon dioxide) + 6H2O (water) + light energy –> C6H12O6 (glucose) + 6O2 (oxygen)
Respiration: C6H12O6 (glucose) + 6O2 (oxygen) –> 6H2O (water) + 6CO2 (carbon dioxide) + energy
Plants use photosynthesis to release oxygen only when there is sunlight, but they release carbon dioxide all the time as a result of respiration. In the day time they release a lot more oxygen than carbon dioxide though.we can get clear notion from:-
C6H12O6 (glucose) + 6O2 (oxygen) –> 6H2O (water) + 6CO2 (carbon dioxide) + energy
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