Table of Contents
Why is light needed for light-dependent reactions?
Overview of the light-dependent reactions. The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH.
How does the light dependent reaction differ from the light-independent reaction?
In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drives the assembly of sugar molecules from carbon dioxide.
What process is light independent?
Calvin-Benson cycle
The light independent process (also called dark reactions or the Calvin-Benson cycle) takes place in the stroma of the chloroplast. Carbon dioxide is modified by series of chemical reactions to form carbohydrates. The energy for these reactions comes from ATP and NADPH generated during the light dependent process.
Why should the light dependent reaction occur before the light independent reaction?
In light – dependent photosynthesis, the photosynthetic pigment absorbs the light energy and convert it into chemical energy, ATP and NADPH2 . So the light-dependent reaction should occur before the light-independent reaction.
Which best describes light independent reactions?
Which best describes light-independent reactions? They are the first stage of photosynthesis. They utilize the energy stored in ATP and NADPH. They use carbon dioxide to synthesize proteins.
What is required for both the light dependent and light-independent reactions to proceed?
Light dependent reactions occur in Grana of Chloroplasts, Light Independent reactions occur in Stroma of Chloroplasts. Hence Chloroplasts are required for both the light-dependent and light-independent reactions to proceed. Elaine C. The answer is energy.
What happens during the light independent reactions?
The light-independent reactions of photosynthesis are the four reactions that take place in the later part of the photosynthesis process. Also known as the Calvin cycle, the four steps of the light-independent or dark reactions are carbon fixation, reduction, carbohydrate formation and regeneration of the initial enzymes.
What are the reactants of the Calvin cycle?
The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP.
What do light independent reactions produce?
The light-dependent reactions synthesize energy from sunlight, and the light-independent reactions use that energy to produce sugars, most commonly known as glucose (C6H12O6), from carbon dioxide (CO2). With the resulting glucose, many living organisms get food and oxygen.
What are the steps in light reactions?
There are three phases to the light-independent reactions, collectively called the Calvin cycle : carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate regeneration. Despite its name, this process occurs only when light is available.