Where do the light and dark reactions of photosynthesis occur?
The light reaction takes place in the thylakoid discs. There, water (H20) is oxidized, and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH. The dark reaction occurs outside of the thylakoids.
What are dark reactions in photosynthesis?
The series of biochemical reactions in photosynthesis that do not require light to proceed, and ultimately produce organic molecules from carbon dioxide. The energy from ATP (produced during the light reactions) drives the dark reactions of photosynthesis.
Is the Calvin cycle the dark reaction?
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 photosynthesis is called dark reaction?
Therefore the dark reaction in photosynthesis is called so because it don ot directly depend on light energy. Dark reaction of photosynthesis has distinct chemical reactions which help in the transformation of carbon dioxide and other compounds to form glucose.
Where does Dark reaction occur?
The dark reactions of photosynthesis occur in the stroma of the chloroplast where they utilize the products of the light reaction. In the dark reaction, plants use carbon dioxide with ATP and NADPH from the light reactions to produce glucose.
What is the dark phase?
Dark phase: It takes place in the stroma or matrix of chloroplast and can take place in the absence of light. The hydrogen coming from the NADPH sums up with carbon dioxide. There is no splitting of water and photolysis in this. It takes up ATP and NADPH produced from the light reaction to break down carbon dioxide.
Why are dark reactions called dark?
How Cells Make Glucose. 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.
Why Calvin cycle is called dark reaction?
The Calvin cycle is a dark reaction because it does not need sunlight. Although it can happen during the day, this process does not require energy from the sun to work. Other names for the Calvin cycle include the Calvin-Benson cycle, light-independent reaction, carbon fixation and C3 pathway.
Is dark reaction also called as Calvin cycle?
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.
Where does the dark reaction occur?
Light reaction and dark reaction are the two types of sequential processes that occur during the photosynthesis of plants. Light reaction occurs in the thylakoid membrane of chloroplast whereas the dark reaction occurs in the stroma of the chloroplast.
Can the dark reaction occur in light?
The dark reaction of photosynthesis is not dependent on sunlight but it does not mean it does not occur in its presence. The dark reaction occurs both in the presence and absence of sunlight. This reaction occurs in the stroma of the chloroplasts which are cell organelles known as the kitchen of the cells.