Question

Which substance from the light-dependent reactions is a source of energy for the light-independent reactions of photosynthesis?

Answer 1

The product of light-dependent reaction ATP and NADPH is a source of energy for the light-independent reactions of photosynthesis.

Further Explanation:

Photosynthesis starts with the absorption of solar or light energy by the plant pigments called chlorophyll. The activated chlorophyll molecule helps in the electron transfer from one acceptor to another forming a chain. Photosynthesis is an anabolic process. This is the process by which glucose and oxygen produce with the help of water, carbon dioxide, and sunlight. Water is breakdown and produces electron which requires starting the photosystem.

${\text{6C}}{{\text{O}}_{\text{2}}}{\text{+6}}{{\text{H}}_{\text{2}}}{\text{O}}\to{\text{6}}{{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}}{\text{+6}}{{\text{O}}_{\text{2}}}{\text{+CHEMICAL ENERGY+ATP}}$  

The first phase of photosynthesis is the light-dependent reaction in which the absorbed light is utilized to produce molecules carrying energy that is used in the second phase to form carbohydrates by reducing carbon dioxide. The first phase produces ATP and NADPH molecule which are utilized by the second phase.

The first phase occurs in the grana the chloroplast and involves the transport of electrons through photosystem II (PS II) followed by photosystem I (PS I). The second phase of photosynthesis is the dark reaction or the light-independent reaction happens in the stroma and utilizes the products formed during the light-dependent phase. The energy gained by the chlorophyll molecule is transferred to PS II in the form of electrons.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Plant Cell

Keywords:

Light-dependent reaction, thylakoid, stroma, grana, membrane, photosynthesis, light-independent reaction, carbon dioxide, water, chemical energy, anabolic process.

Answer 2

The ATP and NADPH which are produced in the light-dependent reactions are utilised as the source of energy in the Calvin Cycle.