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Question #45931

Difficulty: 8/10 | 🟢 Free

The Question

Plant X possesses Kranz anatomy, whereas Plant Y lacks it. A researcher is comparing their photosynthetic efficiencies and compensation points under varying environmental conditions. Which of the following statements regarding their physiological adaptations is INCORRECT?

Options

A.
Plant X exhibits a significantly lower $CO_2$ compensation point than Plant Y because its primary carboxylating enzyme in the mesophyll cells lacks oxygenase activity.
B.
Under deep shade conditions, Plant X will likely exhibit a higher light compensation point than Plant Y due to the additional ATP cost required to regenerate its primary $CO_2$ acceptor.
C.
In Plant X, the spatial separation of pathways ensures that RuBisCO operates in an oxygen-rich environment within the agranal chloroplasts of the bundle sheath cells.
D.
At high temperatures and high light intensities, Plant Y will show a significant decrease in net carbon assimilation compared to Plant X due to increased photorespiration.

Check Your Answer

Correct Answer

Step-by-Step Solution

Explanation

How the Examiner Thinks

Comparative_Analysis

Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.

Concepts Behind This Question

RuBisCO|PEP-Carboxylase|C4-Pathway

Why This Question Is Tricky

Common Mistakes

Conceptual Pivot & Word-Play Trap: Students often memorize that Kranz anatomy 'separates' the light and dark reactions spatially, but fail to connect this to the structural nuance of 'agranal' chloroplasts in the bundle sheath.

The trap relies on the student missing the word 'oxygen-rich'.

The entire evolutionary purpose of Kranz anatomy and agranal bundle sheath chloroplasts is to create an oxygen-poor, $CO_2$ -rich environment to prevent RuBisCO from acting as an oxygenase.

Quick Facts About This Question

Question Information

Subject	Biology
Chapter	Respiration in Plants - Class 11
Concept	Compensation Point Logic
Difficulty	8
Cognitive Load	5
Target Solve Time	120 sec
Access	Free