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Question #45336
The Question
In an evolutionary study of angiosperms adapting to nutrient-poor niches, a lineage is found to rely heavily on a persistent, diploid maternal tissue for seed nutrition rather than the typical triploid post-fertilization tissue. Which of the following statements regarding this specific nutritive tissue is INCORRECT?
Options
- A.
It represents the residual, persistent nucellus, as classically observed in the seeds of black pepper and beet.
- B.
Its cells possess a ploidy level of 2n and have a genetic constitution identical to the maternal plant.
- C.
It serves as an alternative energy storage mechanism, challenging the standard model where the endosperm is the sole nutritive driver.
- D.
It is formed as a direct result of syngamy, ensuring that the developing embryo receives a genetically diverse diploid food reserve.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Beetroot|Perisperm|Adaptive Radiation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that all nutritive tissues within a mature seed (like cotyledons or endosperm) are post-fertilization products.
The trap relies on confusing the origin of the perisperm (pre-fertilization maternal nucellus) with structures formed via syngamy or triple fusion.
Failing to recognize that perisperm is purely maternal and unfertilized leads to missing the incorrect statement.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Perisperm vs Pericarp |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |