I want to decrease the space(shown by blue arrows) between green spirals so that it looks a bit spherical, currently it looks a bit stretched. Any guess how blender provides this option to do it.
I was just finding out each option in the blender and suddenly found the option "Object" tab marked in the picture by with a "1". Then scaled the object around only the required axes.
Amid Lewis commented same answer above on my question.
I was trying the scaling using S key but the mouse was not able to do it with small extent, and I gotya the option while searching.