The initial enzyme of Calvin cycle is

Ribulose 1,5-diphosphate carboxylase

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Triose phosphate dehydrogenase

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Phosphopentokinase

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Cytochrome oxidase

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Solution

The correct option is B Ribulose 1,5-diphosphate carboxylase
The enzyme ribulose bisphosphate carboxylase oxygenase (RuBisCo) catalyses the reaction between RuBP with carbon dioxide and leads to the formation of ribulose-5- phosphate. It is the first enzyme of Calvin cycle. It is the most abundant enzyme in the world.
So, the correct answer is option A.

Suggest Corrections

List-I (Enzyme)	List-II( Conversions)
a. Phosphogluco isomerase	$1$ . Fructose $\to$ Glucose
b. Triose phosphate isomerase	$2$ . Glucose $\to$ Glucose- $6$ -Phosphate
c. Fructose diphosphate aldolase	$3$ . Glucose- $6$ -phosphate $\to$ Fructose- $6$ -phosphate
d. Hexokinase	$4$ . Glyceraldehydes- $3$ -phosphate $\to$ Dihydroxy acetone phosphate
	$5$ . Fructose- $1$ , $6$ -diphosphate $\to$ Glyceraldehydes- $3$ -phosphate