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Sac fungi which contaminate culture medi...

Sac fungi which contaminate culture media and is also referred as ''laboratory weed'' is :

A

Claviceps purpurea

B

Aspergillus niger

C

Neurospora crassa

D

Penicillium chrysogenum

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The correct Answer is:
To solve the question regarding the sac fungi that contaminate culture media and is referred to as "laboratory weed," we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Class of Fungi**: The question specifies "sac fungi," which belong to the class Ascomycetes. This is important to narrow down the options provided. 2. **Review the Options**: The options given are: - Claviceps - Aspergillus niger - Neurospora crassa - Penicillium chrysogenum 3. **Analyze Each Option**: - **Claviceps**: Known for causing plant diseases like ergot of rye; does not contaminate culture media. - **Aspergillus niger**: A common mold that is found everywhere and is known to contaminate culture media. It is often referred to as a "laboratory weed" due to its prevalence. - **Neurospora crassa**: Used primarily in research for biochemical and genetic studies, not known for contaminating culture media. - **Penicillium chrysogenum**: Known for producing the antibiotic penicillin, but not primarily recognized as a contaminant in culture media. 4. **Determine the Correct Answer**: Based on the analysis, Aspergillus niger is the fungus that fits the description of contaminating culture media and is referred to as a "laboratory weed." 5. **Final Answer**: Therefore, the correct answer to the question is **Aspergillus niger**.
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