Question

Is oxygen a product of light reaction?

Answer 1

Photosynthesis:

The process of photosynthesis is divided into two main parts.

Stage One: Light Reactions

1. In the light-dependent process, which takes place in the grana, the stacked membrane structure within chloroplasts, the direct energy of light helps the plant to make molecules that carry energy for utilization in the dark phase of photosynthesis.
2. The plant uses light energy to generate the co-enzyme Nicotinamide adenine dinucleotide phosphate, or NADPH and ATP, the molecules that carry energy.
3. The chemical bonds in these compounds store the energy and are used during the dark phase.

Stage Two: Dark Reactions

1. The dark phase, which takes place in the stroma and in the dark when the molecules that carry energy are present, is also known as the Calvin cycle or C3 cycle.
2. The dark phase uses the ATP and NADPH generated in the light phase to make C-C covalent bonds of carbohydrates from carbon dioxide and water, with the chemical ribulose biphosphate or RuBP, a 5-C chemical capturing the carbon dioxide.
3. Six molecules of carbon dioxide enter the cycle, which in turn produces one molecule of glucose or sugar.

Light reaction:

1. The light reaction is a light-dependent process which means it only initiates when it is supplied with light energy.
2. It includes a series of events such as light absorption, hydrolysis, the release of oxygen, formation of ATP and NADPH.
3. Yes, oxygen is produced in the light reaction of photosynthesis in lumen thylakoid by the photolysis of water.