For The Purpose Of Planting, How Could I Tell Between A Determinate And Indeterminate Tomato From Its Fruits?

Question

I am from Sri Lanka, an island at the tip of India.

Answer 1

Not by the fruits, alone, but by the flowering characteristics. This article will help you to understand the differences between the two types:

https://www.gardeningknowhow.com/edible/vegetables/tomato/determinate-vs-indeterminate.htm