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Question #46228
The Question
During prolonged waterlogging of a mature woody dicot stem, the perennating tissues (such as the vascular cambium) often undergo rapid necrosis. Which of the following best explains the anatomical and biochemical sequence responsible for this systemic fallout?
Options
- A.
Submergence of lenticels halts oxygen diffusion, preventing metabolic water formation and triggering alcoholic fermentation that leads to ethanol toxicity.
- B.
Blockage of complementary cells prevents lenticular transpiration, causing severe thermal stress and denaturation of cambial enzymes.
- C.
Hypoxia in the periderm induces a shift to lactic acid fermentation, causing severe cytoplasmic acidosis and death of the phellogen.
- D.
Water floods the lenticular pores, causing excessive endosmosis and turgor pressure that mechanically crushes the delicate vascular cambium.
Check Your Answer
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
Stem_Modifications|Lenticels_vs_Stomata|Partial_Pressure_Gradient_Logic
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating Plant Anatomy (Lenticels/Periderm) with Cellular Respiration (ETS/Anaerobic pathways).
The trap lies in confusing the type of fermentation (lactic acid vs. alcoholic) and misunderstanding the primary lethal consequence of waterlogging (ethanol toxicity vs. mechanical/thermal stress).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Morphology of Flowering Plants - Class 11 |
| Concept | Stem Modifications |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |