There are a number of respiratory disorders that affect people. The portion of such disorders is especially high. It is because of the more concentration of air contaminants not just in the urban but also in the rural atmosphere.
Cellular respiration is a set of metabolic reactions and procedures that occur in the cells of organisms to transform chemical energy from oxygen molecules or food into adenosine triphosphate and after that release waste products.
The dark reactions occur in the stroma of chloroplast. These reactions do not need light directly and can happen in the existence or absence of light provided the assimilatory power in the form of ATP and NADPH, produced during light reactions is available.