Disclaimer: The answer has been provided for the following question.
Ordinate of all points on the x-axis is
(d) any number
If we take any point on the x-axis, then the distance of this point from the x-axis is 0. Therefore, the ordinate of this point is 0.
The co-ordinate of a point on the x-axis are of the form (x, 0). So, the ordinate of all points on the x-axis is 0.
Hence, the correct answer is option (a).