Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyPhotosynthesis4 Marks
Question
Describe Calvin cycle and its significance.
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Answer
Significance:
$1.$ Carboxylation: $RuBisCO$ is the most abundant enzyme in the world. It is responsible for fixing carbon in the form of $CO_2$ into sugar. As a result of Carboxylation, the first stable product of carbon fixation i.e. $3- \text{PGA}$ is synthesized.
$2.$ Reduction/Glycolytic reversal: $\text{NADPH2}$ donates electrons to $1, 3-$Bisphoshoglycerate to form $3-$ phosphoglyceraldehyde molecules. During this process $\text{ADP}$ and $\text{NADP}$ are generated which are used in light reaction.
$3.$ Regeneration of $RuBP:$ Some $3-$phosphoglyceraldehyde molecules are involved in production of glucose while others are recycled to regenerate the $5-$carbon compound $RuBP$ which used to accept new carbon molecules. Thus, regeneration of $RuBP$ is required for Calvin cycle to run continuously.
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