Question

growth of thread like structures along with the gradual spoilage of tomato can be observed when a cut tomato is kept aside for 4 days interpret the cause of this change

Answer 1

due to citric acid present in tomatoes

Answer 2

These changes occur in cut tomatoes kept in the open as the nutrients present in cut tomatoes provide a suitable medium for the growth of a pathogenic microorganism, especially Salmonella.

The pH and water activity of tomatoes are favourable for the growth of these pathogens.

Once these get attached to the surface of a cut tomato, they start secreting polysaccharide fibres resulting in the formation of biofilm, which enhances their ability to survive even under unfavourable environmental conditions.