question_answer

\[N{{H}_{3}}\]releases from

A)  photorespiration            

B)  dark respiration

C)  CAM                                    

D)  All of these

Correct Answer: A

Solution :

                Respiration that is initiated in chloroplasts and occurs    in    light    only,    is    called photorespiration. This process occurs when there is low \[C{{O}_{3}}\] concentration but high 02 concentration. At mid-day, when temperature and \[C{{O}_{2}}\] content are high, the affinity of RuBP carboxylase increases for \[{{O}_{2}}\] but decreases for \[C{{O}_{2}}\]. Thus, it converts RuBP to 3-carbon compound CPGA) and a 2-carbon compound Cphosphoglycolate). The phosphoglycolate is converted  rapidly to  glycolate  in  the peroxisomes. Glycolate is further converted to glycine, serine, \[C{{O}_{2}}\]and \[N{{H}_{3}}\] without the generation of ATP or NADPH. Thus net result is oxidation of.