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Deuteromycetes are called imperfect fungi because they lack a known:
ASimple hypha
BSexual stage
CSpore case
DSeptate wall
Answer & Solution
Correct answer: B. Sexual stage
1. Only asexual and vegetative phases were known.
2. When a sexual form was found the fungus was moved.
3. So the class is defined by that missing stage.
_Source: NCERT Class 11 Biology, Ch 2 'Biological Classification'_
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