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Question

On Friday, Ravi after having his coffee, left his coffee mug unwashed in the office. When he saw it on Monday, he found that it had some blackish-brown, cottony stuff in it. Which of the following organisms can it most likely be?

A
Mushroom
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B
Bacteria
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C
Rhizopus
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D
Either (A) or (C)
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Solution

The correct option is C Rhizopus
Rhizopus is a cosmopolitan filamentous fungus found in soil and is capable of growing on a number of substrate. The cottony appearance visible seen in the coffee mug is the hyphae of Rhizopus. It can cause human zygomycosis (fungal infection) and can be fatal.
Mushroom does not grow on compost. Bacterial growth does not produce the cottony appearance.

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