which step in photosynthesis does not need light???
The step in photosynthesis that does not require light is the Calvin cycle (also known as the dark reaction or light-independent reaction). This step occurs in the stroma of the chloroplasts and does not directly depend on light, although it typically occurs during the day when there is light available. The Calvin cycle uses the products of the light-dependent reactions (ATP and NADPH) to convert carbon dioxide (CO2) into glucose.
The step in photosynthesis that does not require light is known as the dark or light-independent reaction, also called the Calvin cycle. In this step, carbon dioxide (CO2) from the atmosphere is used to synthesize organic compounds, such as glucose. This reaction occurs in the stroma of the chloroplasts and does not directly rely on light energy. However, it relies on the products of the light-dependent reactions, such as ATP and NADPH, which were generated by capturing light energy in the previous step.
The step in photosynthesis that does not require light is called the Calvin cycle, specifically the third phase of it. To understand this, let's break down the process:
Photosynthesis is a process carried out by plants and some other organisms to convert sunlight, carbon dioxide, and water into glucose (chemical energy) and oxygen. It occurs in the chloroplasts, which contain a pigment called chlorophyll that captures light energy.
The process of photosynthesis consists of two main steps: the light-dependent reactions and the light-independent reactions (also known as the Calvin cycle).
1. Light-dependent reactions: These occur in the thylakoid membrane of the chloroplasts and require light energy. During this step, light energy is absorbed by chlorophyll, and this energy is used to produce ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are energy-carrying molecules.
2. Light-independent reactions (Calvin cycle): This step occurs in the stroma of the chloroplasts and does not directly require light. The Calvin cycle uses the ATP and NADPH produced in the light-dependent reactions to convert carbon dioxide (CO2) into glucose. This process is also known as carbon fixation.
So, to answer your question, the step that does not need light is the light-independent reactions or the Calvin cycle. However, it's important to note that the light-dependent reactions must occur first to provide the ATP and NADPH needed in the Calvin cycle.