Why dont plants need a respiratory system?

Question

its a biology question...about plants i guess the title explains it all...please give a concise answer too

Answer 1

The respiratory system is the biological system of any organism that engages in gas exchange. Even trees have respiratory systems, taking in carbon dioxide and emitting oxygen during the day, consuming carbon dioxide and producing oxygen constantly.Plant respiration is limited by the process of diffusion. Even a baobab tree is mostly dead because air can penetrate only skin deep. However, most plants are not involved in highly metabolic activities like hunting, i.e. they do not need the energy necessary for predators, and thus their breathing is limited.

Plant respiration is the oxidation of certain substrates by enzymes, leading to a release of carbon dioxide. It can be loosely thought of as the opposite of photosynthesis, though the net release of carbon dioxide in respiration is less than carbon uptake in photosynthesis. Sources of glucose for respiration for plants are starch or directly from photosynthesis.

Respiration is an essential life process in plants. It is necessary for the synthesis of essential metabolites including carbohydrates, amino acids and fatty acids, as well as for the transport of minerals and other solutes between cells. It consumes between 25 and 75% of all the carbohydrates produced in photosynthesis at ordinary growth rates

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