Question

Oxidative phosphorylation occurs in respiration and ………………. occur in photosynthesis.
A. oxidative phosphorylation.
B. reduction phosphorylation
C. cyclic phosphorylation.
D. none of the above.

Answer 1

Hint: Photosynthesis helps the occurrence of cyclic photophosphorylation, during photosynthesis carbohydrates are formed by using \[C{O_2}\] and \[{H_2}O\] by capturing radiant energy and releasing Oxygen into the atmosphere to maintain the balance.

Complete answer:
Oxidative Phosphorylation occur during cellular respiration which is energy production process from glucose, In this process energy comes from electrons produced by oxidation of biological molecule, the source of electrons in oxidative phosphorylation is from NADH/\[FAD{H_2}\], the direction of proton pumping is outside the mitochondrial matrix. The movement of protons takes place into the mitochondrial matrix during ATP formation and the \[{O_2}\] is the terminal electron acceptor in oxidative phosphorylation.
In plants during photosynthesis, the photophosphorylation takes place in which light is utilized to convert ADP to ATP and this photophosphorylation is of two types called cyclic and non-cyclic photophosphorylation.
In cyclic, the electron movement occurs in a cyclic manner for the synthesis of ATP and it takes place in the thylakoid membrane and uses photosystem I. the electron is back to P700 for moving into NADP from electron acceptor which causes formation of ATP molecule.
In case of non-cyclic Photophosphorylation, the electrons do not show cyclic manner for ATP formation. In this The lost electron by P680 of photosystem II is captured by P700 of PS-I and not reverted to P680, which shows unidirectional movement of electrons. The source of the electron is \[{H_2}O\] and the direction of proton pumping inside the thylakoid, during the formation of the ATP protons move outside the thylakoid. The terminal electron acceptor is \[NAD{P^ + }\] in the photophosphorylation process.

Hence, the correct answer is D.

Note: In the plant cyclic or non-cyclic photophosphorylation take place inside the chloroplast, which energy formation process or storing in carbohydrates form, while oxidative phosphorylation is energy liberation process, which is oxidation of glucose molecule to liberate energy.