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Question #114121
The Question
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Obligate parasitic Ascomycetes exhibit a significantly reduced repertoire of extracellular hydrolytic enzymes compared to free-living saprophytic Ascomycetes. Reason (R): Obligate parasites bypass the external catabolic breakdown of complex detritus by directly absorbing host-derived carbon skeletons to fuel their amphibolic pathways.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- A.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
- B.
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
- C.
Assertion is correct but Reason is incorrect.
- D.
Assertion is incorrect but Reason is correct.
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
Ascomycetes Sac Fungi|Evolutionary Ecology of Parasitism|Amphibolic Pathway
Why This Question Is Tricky
Examiner Levers
Logical Assertion
Tests the causal relationship between two true statements.
Difficulty Boost : +4Common Mistakes
Conceptual Pivot: Students often memorize the NCERT line that fungi are 'heterotrophic and absorb soluble organic matter' via extracellular enzymes, but fail to distinguish the metabolic nuances between saprophytic and obligate parasitic lifestyles.
The trap is assuming all fungi secrete the same massive array of extracellular digestive enzymes, ignoring the evolutionary metabolic hijack where parasites steal pre-formed carbon skeletons, rendering extensive catabolic enzyme secretion metabolically redundant.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Ascomycetes Sac Fungi |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |