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Question #47555
The Question
The transition from homospory to heterospory in certain pteridophytes (e.g., Selaginella and Salvinia) is considered a crucial evolutionary step toward the seed habit. Which of the following statements regarding this transition is INCORRECT?
Options
- A.
It establishes a nutritional reliance of the developing embryo on the parent sporophyte.
- B.
The female gametophyte is retained on the parent sporophyte for variable periods rather than being an independent, free-living prothallus.
- C.
The differentiation of spores into microspores and megaspores eliminates the dependence on external water for the transfer of male gametes.
- D.
The development of the zygote into a young embryo takes place strictly within the confines of the female gametophyte.
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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
Apomixis Genetics|Vascular Evolution Sequence|Embryo Sac Nuclei Count
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often conflate the 'precursor to the seed habit' with the complete characteristics of true seeds.
The misconception is assuming that because heterosporous pteridophytes show advanced embryo retention, they have also evolved independence from water for fertilization.
NCERT strictly maintains that all pteridophytes require water for fertilization.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Kingdom - Class 11 |
| Concept | Vascular Evolution Sequence |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |