Why is ATP and NADPH required in the dark reactions of photosynthesis?

The dark reaction occurs outside of the thylakoids. In this reaction, the energy from ATP and NADPH are used to fix carbon dioxide (CO2). The products of this reaction are sugar molecules and other organic molecules necessary for cell function and metabolism.

Do dark reactions require ATP and NADPH?

What is a dark reaction? In the dark reaction, plants use carbon dioxide with ATP and NADPH from the light reactions to produce glucose. It takes place in the stroma of the chloroplast.

What happens to ATP and NADPH made during the second stage of photosynthesis?

In the second stage, ATP and NADPH are used to convert the 3-PGA molecules into molecules of a three-carbon sugar, glyceraldehyde-3-phosphate (G3P). This stage gets its name because NADPH donates electrons to, or reduces, a three-carbon intermediate to make G3P.

Is ATP generated in dark reactions?

ATP and NADPH2from the light reactions are used in the dark reactions of photosynthesis that take place in the stroma region of the chloroplast.

Why do we call it dark reaction in photosynthesis?

Photosynthesis consists of two parts. The first requires sunlight and the second does not. The Calvin cycle is also called the dark reactions or light-independent reactions because it is the part that doesn’t need energy from the sun to happen. The Calvin cycle takes place within the stroma of the chloroplast.

What is dark reaction in photosynthesis?

Definition. The series of biochemical reactions in photosynthesis that do not require light to proceed, and ultimately produce organic molecules from carbon dioxide. Supplement. The energy from ATP (produced during the light reactions) drives the dark reactions of photosynthesis.

Why does Calvin cycle stop in the dark?

Though it is called the “dark reaction”, the Calvin cycle does not actually occur in the dark or during night time. This is because the process requires reduced NADP which is short-lived and comes from the light-dependent reactions.

Why do dark reactions depend on light reactions?

The Calvin cycle is also called the dark reactions or light-independent reactions because it is the part that doesn’t need energy from the sun to happen. So although the cycle itself doesn’t use light energy, it does depend on the light reactions to provide it with the ATP and NADPH.

Why does the Calvin cycle stop in the dark?

Why is the Calvin cycle referred to as a dark reaction?

Only the light reaction directly uses light. The Calvin cycle is fueled by products from the light reaction, but doesn’t need light. Therefore it is called the dark reaction.

What is the purpose of generating NADPH and ATP in the light reactions?

The goal of the light-dependent reactions of photosynthesis is to collect energy from the sun and break down water molecules to produce ATP and NADPH. These two energy-storing molecules are then used in the light-independent reactions….

Why is Calvin cycle called dark reaction?

https://www.youtube.com/watch?v=KfvYQgT2M-k