These are slow-growing large coloured patches on the bark of trees and the indicators of air pollution.1 pointNostocLichensMoneraFungi

Identifying the Answer

1. Analyze the Options: The question presents four options: Nostoc, Lichens, Monera, and Fungi. Each of these has different characteristics related to their growth and ecological roles.

2. Key Characteristics:

   • Nostoc: A genus of cyanobacteria, can occur in various environments, but not specifically known for forming large colored patches on tree bark.
   • Lichens: Composite organisms made up of fungi and algae or cyanobacteria. They are well-known indicators of air pollution because they are sensitive to environmental changes, especially pollution.
   • Monera: Refers to a kingdom of simpler prokaryotic organisms, which doesn't specifically relate to the symptoms described in the question.
   • Fungi: A kingdom that includes yeasts and molds, not specifically related to air quality indicators.

3. Conclusion: Lichens are specifically recognized for their slow growth and ability to signal air quality issues due to their sensitivity to pollutants.

Final Answer

Lichens