Where do the electrons get their energy from in the light reactions?

In the photosystem II (PSII) reaction center, energy from sunlight is used to extract electrons from water. The electrons travel through the chloroplast electron transport chain to photosystem I (PSI), which reduces NADP+ to NADPH. The electron transport chain moves protons across the thylakoid membrane into the lumen.

Where does the energy come from to make ATP in the light reactions apex?

Where does the energy come from to make ATP in the light reactions apex? Figure 1. Light reactions harness energy from the sun to produce chemical bonds, ATP, and NADPH. These energy-carrying molecules are made in the stroma where carbon fixation takes place.

What are made in the light reactions of photosynthesis?

Photosynthesis begins with the light reactions. … The energy is then temporarily transferred to two molecules, ATP and NADPH, which are used in the second stage of photosynthesis. ATP and NADPH are generated by two electron transport chains. During the light reactions, water is used and oxygen is produced.

Where does the light reaction takes place?

thylakoid discs
The light reaction takes place in the thylakoid discs. There, water (H20) is oxidized, and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH. The dark reaction occurs outside of the thylakoids.

Where does the energy come from to make ATP at the chloroplast apex?

Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis.

Where do the electrons that are excited by the energy in sunlight first come from?

Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. The excited electron must then be replaced.

What are made in the light reactions of photosynthesis apex?

During photosynthesis, light energy converts carbon dioxide and water (the reactants) into glucose and oxygen (the products).

How do the light reactions help the Calvin cycle apex?

The light reactions capture energy from sunlight, which they change to chemical energy that is stored in molecules of NADPH and ATP. … The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP.

How are photosynthesis and cellular respiration related apex?

Photosynthesis makes the glucose that is used in cellular respiration to make ATP. … While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration.

How do the light reactions help the Calvin cycle?

The light dependent reaction of photosynthesis provides two important requirements ATP and NADPH to the Calvin Cycle. … The light energy is stored in it. It provides the energy for the formation of energy rich chemical bonds in glucose. Finally, it changed into ADP.