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What is the indirect speech of the following sentence?
Ram said, "fire".
Comments  
I think it depends on what Ram meant. Here is a couple of examples I came up with.

Ram said that it was a fire.
OR
Ram said that there was a fire.
OR
Ram indicated the fire.
etc.
Ram exclaimed with fear that there was fire.
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AnonymousRam exclaimed with fear that there was fire.
The original sentence is 'Ram said, "fire".'
If Ram was scared, the original sentence wouldn't contain 'said' but 'screamed' or as you mentioned 'exclaimed'.
Ram ordered to fire.
This is not natural.
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krishanu5What is the indirect speech of the following sentence? Ram said, "fire".
It depends.
Is Ram in a public building and sees flames and smoke and is trying to warn others of the danger?
Or is Ram a instructor on a shooting range and is commanding someone to shoot their gun?