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Question #47518
The Question
The retention of the female gametophyte on the parent sporophyte in Selaginella represents a significant evolutionary precursor to the seed habit. However, unlike true seeds of Spermatophytes, these retained structures cannot enter a state of physiological dormancy to survive prolonged environmental desiccation. Which of the following best explains this specific limitation?
Options
- A.
The megasporangium lacks a protective integumentary envelope to form a hardened, dehydrated coat.
- B.
The fertilization process remains zooidogamous, requiring external water rather than a pollen tube.
- C.
The female gametophyte is entirely free-living and photosynthetic, preventing nutrient accumulation.
- D.
The zygote undergoes immediate reductional division, preventing the formation of a multicellular embryo.
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
Phytochrome Interconversion|Bryophyte Dependence Mechanics|Meristematic Totipotency
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often conflate all 'primitive' traits of Pteridophytes.
While the lack of a pollen tube (Option B) explains why they need water to reproduce, it is the lack of integuments (Option A) that specifically explains why the resulting embryo cannot enter a dehydrated, dormant 'seed' state.
This tests the ability to link specific anatomical structures (integuments) to their exact physiological function (seed coat/dormancy).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Kingdom - Class 11 |
| Concept | Bryophyte Dependence Mechanics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |