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Question #46838
The Question
A targeted mutation in a dicot plant causes a permanent arrest of equational division in the root apical meristem (RAM), including the Quiescent Centre and its immediate initials. This halts the generation of the procambium. Which of the following is an INCORRECT anatomical or physiological consequence of this developmental arrest?
Options
- A.
The root fails to develop radially arranged vascular bundles, disrupting the spatial separation of primary xylem and phloem.
- B.
The inability to form exarch primary xylem prevents the establishment of root pressure and subsequent systemic water translocation.
- C.
The pericycle undergoes premature dedifferentiation to form primary vascular tissues, compensating for the loss of the apical initials.
- D.
The absence of mature sieve tube elements in the region of maturation halts the unloading of photoassimilates, starving the root apex.
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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
Radial vs Conjoint Bundles|Equational Division Logic|Meiotic Arrest Points
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse the compensatory and meristematic capabilities of plant tissues.
While the pericycle is known for its ability to dedifferentiate (a common NCERT fact), it strictly contributes to secondary growth and lateral roots.
It cannot generate primary vascular tissues, which are exclusively derived from the apical meristem's procambium.
This tests the strict developmental lineage of plant anatomy.
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 |