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Question #46840
The Question
A botanist is modeling the biomass accumulation and stellar anatomy of three angiosperm specimens. Specimen X exhibits a restricted, linear growth trajectory in girth due to systemic anatomical limitations. Specimen Y demonstrates non-linear, continuous secondary biomass accumulation and possesses conjoint vascular bundles. Specimen Z also exhibits secondary growth, but its primary xylem and phloem are arranged on alternate radii. Based on NCERT anatomical principles, which of the following statements is INCORRECT?
Options
- A.
Specimen X possesses closed vascular bundles, lacking the intrafascicular cambium necessary for secondary growth.
- B.
The cambial ring in Specimen Y is formed by the dedifferentiation of medullary ray cells joining with the pre-existing intrafascicular cambium.
- C.
In Specimen Z, the continuous cambial ring is partially primary and partially secondary in origin, initially forming a wavy ring that later becomes circular.
- D.
The systemic failure of Specimen X to undergo non-linear girth expansion is due to the absence of a vascular cambium, characteristic of monocotyledonous stems.
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
Radial vs Conjoint Bundles|Cambial Ring Formation|Growth Rate Quantification
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse the origin of the cambial ring in dicot stems versus dicot roots.
While both eventually form a continuous ring to facilitate secondary growth, the dicot stem's ring is partially primary and partially secondary, whereas the dicot root's ring is entirely secondary in origin.
The trap in Option C leverages the correct 'wavy ring' morphological fact to mask the incorrect 'partially primary' developmental origin.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Anatomy of Flowering Plants - Class 11 |
| Concept | Radial vs Conjoint Bundles |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |