Biology Question 115 – NEET-UG 2024
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Fungi are primarily classified into major groups based on their morphological features, particularly the structure of their mycelium, the types of spores they produce (both sexual and asexual), and the presence and characteristics of their fruiting bodies.
Let's evaluate each option in the context of fungal classification:
1. **Mode of nutrition:** All fungi are heterotrophic (saprophytic, parasitic, or symbiotic). While the specific type of heterotrophy can vary, the general 'mode of nutrition' (heterotrophic) is a defining characteristic of the entire kingdom Fungi, not a primary criterion for differentiating major classes *within* the kingdom.
2. **Mode of spore formation:** This is a crucial criterion. Fungi are classified based on the types of sexual spores (e.g., zygospores in Zygomycetes, ascospores in Ascomycetes, basidiospores in Basidiomycetes) and asexual spores (e.g., conidia, sporangiospores) they produce.
3. **Fruiting body:** The presence and type of fruiting body (e.g., ascocarp in Ascomycetes, basidiocarp in Basidiomycetes) are key distinguishing features used in classification.
4. **Morphology of mycelium:** The structure of the mycelium (e.g., septate vs. aseptate, coenocytic vs. non-coenocytic) is a fundamental characteristic used for classification (e.g., Zygomycetes typically have aseptate mycelium, while Ascomycetes and Basidiomycetes have septate mycelium).
Remember that a criterion for classification helps to distinguish *between* different groups within a larger category.
Based on the analysis, 'Mode of nutrition' is a characteristic common to all fungi and does not serve as a primary criterion to classify them into their major taxonomic groups. The other three options are all significant criteria used for fungal classification.
The question asks for what is *not* a criterion. Focus on the option that is a general characteristic of the entire group rather than a distinguishing feature between subgroups.