A root is the value of the variable (usually, x) for which the polynomial is zero. Equivalently, a root is an x-value at which the graph crosses the x-axis.
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That refers to a point where the graph crosses the x-axis - in other words, where the function is equal to zero.
A value of the variable when the polynomial has a value of 0. Equivalently, the value of the variable when the graph of the polynomial intersects the variable axis (usually the x-axis).
1+x2 is a polynomial and doesn't have a real root.
No,
5
The degree is equal to the maximum number of times the graph can cross a horizontal line.