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Question #47483
The Question
Consider a rare basidiolichen where the fungal partner (mycobiont) suffers a mutation that completely prevents karyogamy and subsequent basidiocarp formation. Which of the following represents the most accurate ecological and evolutionary consequence for this symbiotic unit?
Options
- A.
The lichen will fail to colonize new habitats because the production of soredia and isidia is strictly dependent on the completion of the fungal sexual cycle.
- B.
The symbiotic association will break down immediately, as the phycobiont relies on the basidiocarp for the absorption of water and mineral nutrients.
- C.
The lichen can continue vegetative dispersal via soredia, but the mycobiont's inability to undergo meiosis severely restricts the generation of new genetic recombinants for long-term adaptation.
- D.
The phycobiont will undergo compensatory sexual reproduction to produce recombinant zoospores, thereby maintaining the evolutionary fitness of the lichen thallus.
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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
Basidiomycetes_Reproductive_Structure|Lichen_Symbiotic_Logic|Symbiotic_Nitrogen_Fixation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Differentiating between the vegetative co-dispersal of the holobiont (soredia) and the independent sexual dispersal of the mycobiont (basidiospores).
Common Misconception: Students often conflate fungal fruiting body formation with the overall survival or vegetative propagation of the lichen, failing to realize that lichens heavily rely on clonal soredia for immediate ecological expansion while reserving sexual spores for genetic recombination.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Basidiomycetes Reproductive Structure |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |