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(A) The two primary pathways or circuits for the fixation (installation) of $CO_2$ in plants are the $C_3$ cycle (Calvin cycle) and the $C_4$ cycle (H

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$C_3$ and $C_4$ cycles

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(A) The two primary pathways or circuits for the fixation (installation) of $CO_2$ in plants are the $C_3$ cycle (Calvin cycle) and the $C_4$ cycle (Hatch-Slack pathway). In the $C_3$ cycle,$CO_2$ is fixed by the enzyme $RuBisCO$ to form a $3$-carbon compound ($3$-$PGA$). In the $C_4$ cycle,$CO_2$ is initially fixed by the enzyme $PEP$ carboxylase to form a $4$-carbon compound $(OAA)$. Therefore,the correct answer is $C_3$ and $C_4$ cycles.

What are the two circuits for the installation of $CO_2$?

Similar Questions

Name the two important enzymes of $C_3$ and $C_4$ pathways, respectively. What important role do they play in fixing $CO_2$?

Which of the following is the first stable product in the $C_3$ and $C_4$ cycle of photosynthesis,respectively?

The $C_4$ and $C_3$ plants differ from each other in

$A$: Light harvesting complexes $(LHC)$ on thylakoid membrane broaden the range of light absorption.
$R$: They transfer electrons to the reaction centre.

Give scientific reasons:
$(1)$ Green plants form the basis of life on Earth.
$(2)$ Photosynthesis is a complex metabolic process.

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