Question

what is dark reaction

Answer 1

the cycle of reactions (the Calvin cycle) which occurs in the second phase of photosynthesis and does not require the presence of light

Answer 2

Hey !!

• Dark reaction of photosynthesis occurs in stroma(matrix) part of chloroplast.
• It is also known as Calvin cycle or C₃ cycle.
• In this cycle one mole of hexose sugar (glucose) is formed by 18 ATP + 12 NADPH₂. This process of CO₂-fixation occurs in the presence of RuBisCO enzyme (most abundant enzyme).
• In some plants instead of C₃ cycle, C₄ cycle is observed. In this cycle, first stable product of CO₂-fixation is a four carbon compound unlike C₃ plants in which it is a 3 carbon compounds.
• This 4C compound produced in C₄ cycle is
• Oxaloacetic Acid(OAA). Which is the first product of Hatch and Sla.k pathway,
• In C₄ plants a special type of leaf anatomy, Kranz anatomy is seen.
• Example:- C₄ plant that are monocots are sugarcane, maize, Cyprus and dicots are Amaranthus, Artiplex can show both C₃ and C₄ cycle.
• In plants such as Opunita, Bryophyllum, Agave, etc. CO₂-fixation occurs at night. These plants are known as CAM plants and this process is known as Crassulaceae Acid Metabolism (CAM).          

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