How Do Plants Respire?

 The plants do not have any special respiratory system so they have to respire in all of their individual parts like leaf, steam and root.  r plants respire

Plants respire all the time because their cells need 

energy to stay alive but plants can only photosynthesize when they are in the light each plant part bleeds through its external layer of cells roots breathe through root hairs stems breathe through epidermis leaves have numerous small pores called stomata for breathing.

The exchange of oxygen and carbon 

dioxide in the leaf occurs through pores called stomata. Normally stomata open when the light strikes the leaf in the morning and close during the night the immediate cause is a change in the pressure gradient or the turgor of the guard cells. The inner wall of each guard cell is thick and elastic when turgor develops the thin outer walls of the stoma bulge out forcing the stoma to open.

When the guard cells loose turgor the elastic inner walls regain their original shape and the stoma closes.

Woody stems are covered with suberin a waxy

 waterproof substance so cork is as impervious to oxygen and carbon dioxide as it is to water however the cork of woody stems is perforated by  lenticels. They enable oxygen to reach the intercellular spaces of the interior tissues and carbon dioxide to be released to the atmosphere. Plants also manufacture their food with the help of sunlight water and carbon dioxide from the air.

Respiration and photosynthesis are opposites. Respiration uses oxygen and produces carbon dioxide, photosynthesis uses carbon dioxide and produces oxygen. Plants respire all the time whether it is dark or light they photosynthesize only when they are in light. The presence of light also affects the plant physiology and the effect of light on the processes of photosynthesis and respiration in plants.