Question

Why the direction of flame in upward direction​

Answer 1

The direction of fire is whatever way the wind is blowing. Seriously. In a calm location, the heated air goes upwards.

As to the composition: it's a bit tricky. The simple bit is that various molecules produced during combustion (usually oxidation) are very energetic, and shortly after combustion, they cool off by emitting photons. If you look closely, you'll see that the visible flame is not in contact with the burning material but just above it.

There's more, but I'm not genius...

Jai brainly !!!