NEET BIOLOGY

Detailed explanation-1: -Because RuBP and RuBisCO are regenerated in the process, but sugar is converted, CO2 must enter the Calvin cycle continually for the light-independent/dark reactions to occur.

Detailed explanation-2: -Figure 5.15 The Calvin cycle has three stages. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, the organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue.

Detailed explanation-3: -The 3-phosphoglycerate enters the dark reaction of photosynthesis or the Calvin cycle where it is converted to RuBP.

Detailed explanation-4: -The Calvin Cycle Once in the mesophyll cells, CO2 diffuses into the stroma of the chloroplast-the site of light-independent reactions of photosynthesis.

Detailed explanation-5: -In the Calvin cycle, carbon atoms from CO2start text, C, O, end text, start subscript, 2, end subscript are fixed (incorporated into organic molecules) and used to build three-carbon sugars. This process is fueled by, and dependent on, ATP and NADPH from the light reactions.