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Question #47488
The Question
Fungi belonging to Deuteromycetes are often morphologically identical to Basidiomycetes in their vegetative state, yet they remain taxonomically isolated. If a Deuteromycete is to be definitively reclassified into Basidiomycetes, which of the following physiological sequences must be observed, and what is the primary reason for its prior isolation?
Options
- A.
Plasmogamy of somatic cells -> Prolonged dikaryophase (n+n) -> Karyogamy and meiosis in a basidium producing exogenous spores; isolated previously due to the absence of a known sexual cycle.
- B.
Plasmogamy of gametangia -> Transient dikaryophase -> Karyogamy and meiosis in an ascus producing endogenous spores; isolated previously due to the lack of septate mycelium.
- C.
Plasmogamy of somatic cells -> Immediate karyogamy (2n) -> Meiosis in a basidium producing exogenous spores; isolated previously because it reproduced exclusively via vegetative fragmentation.
- D.
Plasmogamy of somatic cells -> Prolonged dikaryophase (n+n) -> Karyogamy and mitosis in a basidium producing endogenous spores; isolated previously due to the absence of a known sexual cycle.
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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
Trichoderma_polysporum|Deuteromycetes|T-cell_Inhibition
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing the sexual cycles of higher fungi.
Students must recognize that Basidiomycetes are defined by a prolonged dikaryophase, somatic plasmogamy, and exogenous spores (unlike Ascomycetes' endogenous spores).
The trap also tests the misconception that Deuteromycetes lack septate mycelium; they are actually septate, which is why discovering their sexual cycle seamlessly integrates them into Ascomycetes or Basidiomycetes.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Deuteromycetes 'Fungi Imperfecti' |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |