Question

a riddle try it

I am a 5 letter word
My last 2 letter is a preposition
My last 3 letter is a need of a life
My last 4 letter is a source of energy
And the word is used to make a food material

Answer 1

I think wheat is the right answer
wheat is used to make food materials like flour
last 4 letters = Heat, a form of energy
last 3 letters = Eat, need of life
last two letters = At, a preposition

Answer 2

wheat is the answer

at , eat, heat