Question

Order the steps through which atp synthesis occurs during the light-dependent reactions of photosynthesis in plants.

Answer 1

The basic steps of light-dependent reactions are:

• Light absorption in Photosystem II (PSII) and excitation of PSII

• ATP synthesiS-proton gradient in electron transport chain isdriving ATP production in a process of chemiosmosis

• Light absorption in Photosystem I (PSI) and excitation of PSI

• Reduction of NADP+ and the photolysis of water.

Answer 2

The following are the steps:

1. Energy from the Sun ejects electrons from chlorophyll and dissociates the molecules of water to produce hydrogen ions.

2. The electrons move down the gradient and discharge energy, which pumps hydrogen ions into the thylakoid space.

3. In the thylakoid space, the concentration of hydrogen ions elevates.

4. The hydrogen ions get diffuse through the thylakoid membrane into the stroma with the help of ATP synthase.

5. ATP synthase utilizes the energy discharged as the ions of hydrogen move from the area of high concentration to the areas of low concentration to produce ATP.