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Question #46829
The Question
Kranz anatomy in C4 plants ensures high photosynthetic efficiency by maintaining a high CO2 concentration around RuBisCO. Considering the anatomical and physiological integration required for this pathway, which of the following statements is INCORRECT?
Options
- A.
Bundle sheath cells are characterized by a large number of chloroplasts, lack of intercellular spaces, and thick walls impervious to gaseous exchange.
- B.
The transport of malic acid from mesophyll cells to bundle sheath cells, and the return of pyruvic acid, occurs via plasmodesmata rather than vascular tissue.
- C.
To sustain the massive water flux required by the C4 CO2-pump mechanism, monocot C4 crops like Saccharum (sugarcane) rely on vascular cambium to generate extensive secondary xylem.
- D.
The intimate association of bundle sheath cells with vascular bundles facilitates the immediate loading of synthesized sugars into the phloem.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Bundle Sheath Cells|Phellogen|PEP Carboxylase|RuBisCO
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Cross-chapter synthesis between 'Anatomy of Flowering Plants' and 'Photosynthesis in Higher Plants'.
The trap exploits the logical assumption that high vascular demand requires secondary growth, forcing students to remember the fundamental taxonomic constraint that major C4 crops are monocots and inherently lack a vascular cambium.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Periderm Components |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |