Questions

What are the main steps in non-cyclic photophosphorylation?

Standard

What are the main steps in non-cyclic photophosphorylation?

In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH….Here are the basic steps:

  • Light absorption in PSII.
  • ATP synthesis.
  • Light absorption in PSI.
  • NADPH formation.

What are the steps in cyclic photophosphorylation?

The two-step process comprises: The light reaction which takes place in the grana of the chloroplast where light energy gets converted to chemical energy as ATP and NADPH. In this reaction, the addition of phosphate in the presence of light or the synthesizing of ATP by cells is known as photophosphorylation.

What are the events in Noncyclic photophosphorylation?

During non-cyclic photophosphorylation, the electrons released by P700 are carried by primary acceptor and are finally passed on to NADP. Here, the electrons combine with the protons – H+ which is produced by splitting up of the water molecule and reduces NADP to NADPH2.

What is the first step in non-cyclic photophosphorylation?

Excitement of an electron of chlorophyll by photon of light.

What are the steps of light reaction?

These reactions occur within specialised membrane discs within the chloroplast called thylakoids and involve three steps: Excitation of photosystems by light energy. Production of ATP via an electron transport chain. Reduction of NADP+ and the photolysis of water.

How many ATP are produced in non-cyclic photophosphorylation?

1 ATP
Non-cyclic photophosphorylation produces 1 ATP and 2 NADPH2 molecules.

What is noncyclic electron flow?

This cooperative process of energy production is called non-cyclic photophosphorylation and the transfer of electrons from water to NADPH, known as the Hill Reaction, is noncyclic electron flow. Light is absorbed at PS II, causing the photosystem to grab electrons from water and excite them to a primary acceptor.

Which of the following is the correct order of the steps in Noncyclic photophosphorylation?

Hence, the correct answer is ‘iii,ii,i,iv’

What is the second step in photosynthesis?

The second stage of photosynthesis is called the Calvin cycle. Photosynthesis takes place in two stages – the first phase is where the light reactions or the light-dependant reactions occur. In the second stage, the light-independent reaction takes place, the Calvin cycle.

What is the 1st step of photosynthesis?

The first step in photosynthesis is the light reaction or photochemical reactions resulting in the formation of ATP and NADPH, which are later utilised in the biosynthesis process. In the first stage, light energy is captured and converted to chemical energy. Oxygen is produced by splitting of water.