Final answer:
Fungi are mostly saprobes that break down decaying organic matter and release nutrients for other organisms. They do not contribute to the biodeterioration of stone building materials and concrete wastewater distribution systems.
Step-by-step explanation:
Fungi are mostly saprobes, organisms that derive nutrients from decaying organic matter. They obtain their nutrients from dead or decomposing organic matter, mainly plant material. Fungal exoenzymes are able to break down insoluble polysaccharides, such as the cellulose and lignin of dead wood, into readily absorbable glucose molecules. Fungi fulfill an important ecological role as decomposers and recyclers, releasing nutrients from decaying matter and making them available for other organisms. Some species of fungi are being investigated for their potential use in bioremediation to break down pollutants like diesel oil and heavy metals.
Therefore, the statement 'Fungi are the main contributor to the biodeterioration of stone building materials and concrete wastewater distribution systems' is False.