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Photosynthesis in $C_{4}$ plants is relatively less limited by atmospheric ${CO}_{2}$ levels because

1.	The primary fixation of CO₂ is mediated via PEP carboxylase.
2.	Effective pumping of CO₂ into bundle sheath cells.
3.	Four carbon acids are the primary initial CO₂ fixation products.
4.	RuBisCO in C₄ plants has higher affinity for CO₂.

Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples | Question on C4 Pathway |

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Hints

Consider the two statements:

I.	The C₄ photosynthesis pathway uses more energy than the C₃ photosynthesis pathway.
II.	C₄ plants are able to more efficiently fix carbon in drought, high temperatures, and in limitations of nitrogen or CO₂.

1.	Both I and II are correct and II explains I
2.	Both I and II are correct but II does not explain I
3.	Only I is correct
4.	Both I and II are incorrect

Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |

From NCERT

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Hints

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