Question

Cyclic photophosphorylation results in the formation of
A. $NADPH + {H^ + }$
B. $ATP$and $NADPH + {H^ + }$
C. $ADP$
D. $ATP$

Answer 1

Hint:Photophosphorylation is the process of utilizing light energy from photosynthesis to convert ADP to ATP.

Complete answer:
The process in which formation of energy in the form of ATP (Adenosine triphosphate) takes place is called phosphorylation.
If the energy formation i.e., ATP formation takes place in presence of light, the process is referred to as photophosphorylation (photo-light, phosphorylation-energy formation /ATP formation).
The process of phosphorylation can be further categorized into cyclic phosphorylation and can be further categorized into cyclic phosphorylation and non-cyclic phosphorylation. The expelled electron does not come back to the same photosystem in non-cyclic phosphorylation whereas in cyclic phosphorylation, the expelled electron comes back to the same photosystem.
Cyclic phosphorylation results in the formation of ATP. ATP stands for Adenosine triphosphate which is known as the energy currency and is formed by the mitochondria of cells. As mitochondria is involved in synthesis of ATP, mitochondria are called ‘powerhouse of cell’. Cyclic phosphorylation is performed by photosystems independently and it takes place in stroma lamellae. Since it is not involved with photolysis or splitting of water, no evolution of oxygen takes place. Only a single pigment system operates, the electron is circulated within the photosystem due to cyclic transfer of electrons.

Note:When plant has sufficient amount of NADPH (reducing agent) no more synthesis of NADPH is necessary that is involved in both photosystems in cyclic phosphorylation, only one photosystem is active which is beneficial as it can generate ATP with low cost and is advantages.