Question

What is the overall purpose of the light reactions in photosynthesis?​

Answer 1

Answer:

The Light Reactions of Photosynthesis. Light is absorbed and the energy is used to drive electrons from water to generate NADPH and to drive protons across a membrane. These protons return through ATP synthase to make ATP.

Explanation:

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Answer 2

Answer: The conversion of light energy into chemical energy is the overarching goal of the light-dependent processes. The Calvin cycle will utilise this chemical energy to power the formation of sugar molecules.

Explanation:

Process through which light reactions happen and its overall purpose:

• The photosystem, a collection of pigment molecules and proteins, is where the light-dependent reactions start. Thylakoids have membranes with photosystems. In the photosystem, each pigment molecule takes in one photon, or "packet," of light energy.

• The photon of light energy travels till it encounters a chlorophyll molecule. An electron in chlorophyll is "stimulated" by the photon, and the energy it receives permits it to separate from an atom of the chlorophyll molecule. Therefore, it is claimed that chlorophyll "donates" an electron .
• A water molecule is broken in order to replenish the electron in the chlorophyll. In the thylakoid space, this splitting causes the release of one electron and the creation of oxygen (O₂) and hydrogen ions (H+). In theory, the splitting of a water molecule releases two electrons, which can thus replace two supplied electrons.
• Chlorophyll can respond to a subsequent photon thanks to the replacement of the electron. Byproduct oxygen molecules are created, and these molecules end up in the environment. The remaining light-dependent processes depend heavily on the hydrogen ions.
• The light-dependent processes' goal is to transform solar energy into chemical carriers for the Calvin cycle. Two photosystems are present in eukaryotes and some prokaryotes. The first is known as photosystem II, and it was given that name rather than according to the order in which its functions were discovered.

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