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Question #45954
The Question
In human physiology, Atrial Natriuretic Factor (ANF) acts as a systemic 'brake' on the Renin-Angiotensin-Aldosterone System (RAAS) to prevent runaway hypertension. In plants, maintaining meristematic totipotency without runaway unorganized proliferation (tumorigenesis) requires a delicate stoichiometric balance of growth regulators. Applying this cross-kingdom logic of feedback and antagonism to plant tissue culture and phytohormones, which of the following statements is INCORRECT?
Options
- A.
In vitro, an intermediate and balanced stoichiometry of Auxin and Cytokinin bypasses natural differentiation 'brakes', resulting in the continuous proliferation of an unorganized mass of cells called callus.
- B.
To halt unorganized callus proliferation and force shoot apical meristem differentiation, the stoichiometric ratio must be shifted in favor of Cytokinins over Auxins.
- C.
Abscisic Acid (ABA) acts as a functional analog to ANF by serving as a broad-spectrum antagonist to growth promoters like Gibberellins, thereby halting runaway metabolism to induce seed dormancy.
- D.
Shifting the hormonal stoichiometry to a high Auxin-to-Cytokinin ratio acts as a differentiation 'brake' on the callus, antagonizing root apical meristem formation to exclusively promote shoot organogenesis.
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
Meristematic Totipotency|ANF Antagonism|Feedback Mechanism Loops
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot & Functional Confusion: Students frequently memorize that 'Auxin and Cytokinin control differentiation' but mix up their specific morphogenic outcomes.
The trap relies on wrapping a fundamentally reversed fact (Auxin = shoots, Cytokinin = roots) in complex, plausible-sounding systemic terminology ('differentiation brake', 'antagonizing') to test if the student has absolute clarity on the NCERT-mandated Auxin-Cytokinin stoichiometry.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Growth and Development - Class 11 |
| Concept | Meristematic Totipotency |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |