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Question #45485
The Question
In many angiosperms, self-incompatibility acts as an 'autoimmune-like' mechanism where the pistil recognizes and actively aborts self-pollen tubes to prevent inbreeding. Regarding Gametophytic Self-Incompatibility (GSI) and the pollen-pistil dialogue, which of the following statements is INCORRECT?
Options
- A.
The rejection is a dynamic process mediated by a chemical dialogue between the pollen and the pistil.
- B.
The compatibility phenotype of the pollen grain is determined solely by its own haploid genotype.
- C.
The recognition proteins responsible for triggering this rejection are synthesized by the tapetum and deposited in the exine.
- D.
The self-recognition event typically leads to the arrest of pollen tube growth within the transmitting tissue of the style.
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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
Pollen Wall Chemistry|Autoimmunity Principles|Genetic Variation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The distinction between Gametophytic (haploid pollen-derived) and Sporophytic (diploid tapetum-derived) origins of recognition proteins.
Students often memorize that the tapetum contributes to the pollen wall (exine) but fail to logically deduce that tapetum-derived proteins represent the diploid parent's genotype, and thus cannot mediate gametophytic self-incompatibility.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Pollen Wall Chemistry |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |