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‘Swiss cheese’ formation - A fungus involvement

Aspergillus niger - a bacterium

Trichoderma - plays a role in sewage treatment

Cyanobacteria - Biofertilizers in paddy fields

answer is D.

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Detailed Solution

The large holes in ‘Swiss cheese’ are due to production of a large amount of ${CO}_{2}$ by a bacterium named Propionibacterium sharmanii.

Aspergillus niger is a fungus produces citric acid.

Trichoderma species are free-living fungus that is very common in the root ecosystems. It is effective biocontrol agents of several plant pathogens.

In paddy fields, cyanobacteria serve as an important biofertilizers.

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