Life processes take place in all living cells, so they need energy, and they receive it in the process of breathing. Consequently, all parts of the plant, consisting of living cells, breathe.
The process of respiration is especially intense in young tissues and organs of the plant, since a lot of oxygen is required for cell division and growth, the formation of flowers and fruits.
At the end of growth, with yellowing of the leaves, and especially in winter, the intensity of respiration decreases markedly, but does not stop.
You can make sure that all the organs of the plant breathe in the following experiment.
We put freshly cut plant shoots in one of the glass jars, in the other – carrot roots, and in the third – 30-40 swollen pea or beans (in dry seeds, vital processes, including respiration, proceed very slowly). Close all the jars with plastic lids and put them in a dark place.
Let’s check in a day how the air composition has changed in them. To do this, put a lit candle in each of the cans.
Candles are extinguished in all jars. Consequently, the shoots, roots and germinating seeds during respiration consumed the oxygen in the air of the can and increased the carbon dioxide content in it.
Conclusion: when breathing, plants absorb oxygen and emit carbon dioxide.