Question

Non-cyclic photophosphorylation results in production of
(A) ADP
(B) ATP
(C) NADPH
(D) ATP and NADPH

Answer 1

Hint: Photophosphorylation takes place in chloroplast. Photophosphorylation is made up of two words: photo and phosphorylation. Photo refers to light. Phosphorylation is defined as the addition of phosphate groups. Hence photophosphorylation is defined as the addition of phosphate groups into ADP in presence of light energy.

Complete answer:
Phosphorylation is the addition of phosphate groups into ADP. There are two types of phosphorylation:
Oxidative phosphorylation: It involves reduction of oxygen to water. In this case, electrons are donated by FADH2 and NADH. It occurs in light as well as in dark conditions.
Photophosphorylation: It involves oxidation of water. Oxygen is converted into water. NADP+ acts as an electron acceptor and it occurs only in presence of light.
Photophosphorylation takes place in the chloroplast of plant cells. Photophosphorylation events are found in the light phase of photosynthesis. Photophosphorylation is made up of two words: photon and phosphorylation. Photon means packets of light. Phosphorylation is the addition of phosphate groups into ADP. Hence, photophosphorylation is defined as the addition of phosphate into ADP which leads to synthesis of ATP in the presence of sunlight energy.
There are two types of photophosphorylation:

Cyclic photophosphorylation	Non cyclic photophosphorylation
Photolysis of water does not occur.	Photolysis of water occurs.
Photosystem 1 is involved.	Photosystem 1 and 2 is involved.
Electrons flow in a cyclic pattern.	Electrons flow in a linear pathway.
ATP’s are produced only.	ATP and NADPH are produced.
Oxygen gas is not evolved.	Oxygen gas has evolved.

As seen in the table that ATP, NADPH are produced in non- cyclic photophosphorylation. But Only ATP is produced in cyclic photophosphorylation.

That’s why the right answer is: ‘ATP and NADPH’ or ‘option D’. .

Note: Oxidative phosphorylation and photophosphorylation are two types of synthesis of energy in the form of ATP. Photophosphorylation takes place due to sunlight whereas oxidative phosphorylation does not require sunlight.