'Root' in the Bible

And already the axe is applied to the root of the trees; every tree therefore not producing good fruit is cut down and cast into the fire.

but when the sun rose they were burned up, and because of not having any root were dried up;

but has no root in himself, but is for a time only; and when tribulation or persecution happens on account of the word, he is immediately offended.

But he said, No; lest in gathering the darnel ye should root up the wheat with it.