Question

Which among the following is an eukaryotic beneficial microbe?

• A. Aspergillus niger
• B. Acetobacter aceti
• C. Clostridium butylicum
• D. Lactobacillus

Answer 1

The correct option is A Aspergillus niger

Certain microbes are used for the production of beneficial products like organic acids.

Some of them include:

• Aspergillus niger: it is a fungus and is used in the production of citric acid. Fungi are eukaryotic as they have a well-defined nucleus and are multicellular (with the exception of yeast which is unicellular).
• Acetobacter aceti: it is a bacterium and is used in the production of acetic acid
• Clostridium butylicum: it is a bacterium and is used in the production of butyric acid
• Lactobacillus: it is a bacterium which is used to prepare curd from milk. These bacteria ferment the milk sugar lactose to produce lactic acid.

Bacteria belong to the kingdom Monera. Bacteria are prokaryotes as they lack a well-defined nucleus and membrane bound organelles.

Hence, option a is the correct answer.