Q.14 Morchella esculenta, often found growing under trees in orchards,
with an edible ascocarp, belongs to the class ________.
Morchella esculenta belongs to the class Ascomycetes. This edible morel mushroom, known for its honeycomb-like ascocarp and growth under orchard trees, produces sexual spores in sac-like asci, a defining feature of Ascomycetes. The correct answer is option (3).
Option Analysis
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(1) Zygomycetes: These fungi form non-septate hyphae and reproduce via zygospores in sporangia; examples include Rhizopus and Mucor. Morchella esculenta lacks these traits, as it has septate hyphae and asci instead.
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(2) Basidiomycetes: Known for basidiospores on club-shaped basidia; typical of mushrooms like Agaricus. Morchella does not produce basidia but asci, ruling this out.
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(3) Ascomycetes: Correct, as Morchella esculenta is classified under Ascomycota phylum, Pezizomycetes class (a subclass of Ascomycetes in many exam contexts), with edible ascocarps featuring asci.
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(4) Deuteromycetes: Imperfect fungi lacking known sexual stages (e.g., Alternaria). Morchella has a well-defined sexual ascocarp, so it fits Ascomycetes perfectly.
Morchella esculenta class Ascomycetes is a prized edible mushroom with a distinctive honeycomb ascocarp, often growing under trees in orchards. This fungus exemplifies Ascomycetes through its sac-like asci containing ascospores.
Taxonomy Breakdown
Morchella esculenta falls under Kingdom Fungi > Phylum Ascomycota > Class Pezizomycetes (Ascomycetes subclass) > Order Pezizales > Family Morchellaceae > Genus Morchella. Its ascocarp, the fruiting body, is fully edible and emerges in spring on humus-rich soils near trees like ash or elm.
Why Not Other Classes?
| Class | Key Features | Why Not Morchella esculenta? |
|---|---|---|
| Zygomycetes | Zygospores, aseptate hyphae (e.g., Mucor) | Lacks zygospores; has septate hyphae and asci |
| Basidiomycetes | Basidia, basidiospores (e.g., Agaricus) | No basidia; produces asci instead |
| Deuteromycetes | Asexual only (e.g., Alternaria) | Has sexual ascocarp stage |
| Ascomycetes | Asci in ascocarps (e.g., Saccharomyces, truffles) | Matches perfectly with edible ascocarp |
This classification is key for exams like NEET or GATE Life Sciences, where Morchella pairs with other Ascomycetes like truffles.
Habitat and Significance
Found in temperate orchards post-rain, Morchella esculenta is saprotrophic, colonizing decaying wood. It’s nutritionally rich, used in cuisine and medicine, but requires cooking to avoid toxicity.
