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Question #46235
The Question
A researcher is analyzing a dicotyledonous weed that exhibits reticulate venation alongside distinct Kranz anatomy. Which of the following physiological or anatomical characteristics is NOT expected in this plant?
Options
- A.
Its bundle sheath cells possess thick walls that are impervious to gaseous exchange and lack intercellular spaces.
- B.
It exhibits a continuous increase in the rate of photosynthesis when atmospheric CO2 concentration is raised to 450 ppm.
- C.
The dense venation network ensures minimal diffusion distance for the transport of C4 acids to the bundle sheath.
- D.
The decarboxylation of malic acid in the bundle sheath maintains a high CO2 concentration, effectively suppressing RuBisCO's oxygenase activity.
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
Reticulate_Venation|Photorespiration_Metabolic_Cost|C3_vs_C4_Plants
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often associate reticulate venation exclusively with C3 dicots and assume they will show the CO2 fertilization effect.
However, the explicit mention of 'Kranz anatomy' overrides the venation pattern, making it a C4 plant.
The trap relies on confusing the CO2 saturation points of C3 (450 ppm) and C4 (360 ppm) plants, testing the application of Blackman's Law of Limiting Factors.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Leaf Venation Patterns |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |