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Columella is a specialised structure found in the sporangium of:

1. Ulothrix
2. Rhizopus
3. Spirogyra
4. None of these

Correct answer: Rhizopus

Solution

In Rhizopus, the sporangium has a central sterile, dome-shaped structure called the columella. This feature is characteristic of many zygomycete fungi and is not found in Ulothrix or Spirogyra.

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