Question

how to make easy n attractive model of step farming

Answer 1

you could put layers of something like thermocol /foam paper in a manner that it looks somewhat like this
then paint it accordingly green
if thats a foam paper then use fevicol/feviquik to paste but if your using termocol then use toothpicks or high sticking gum.
if want to add more details then you could make a clay farmer model and add trees in middle like given in the pic

Answer 2

you can use cardboard to make the base and use clay to cover the base and stick the small clay green particles to show the grass and some strips of green glace paper show the terrace farming and before putting the strips put a brown paper to show it's on the mountain and put a waterfall and put some cardboard mountains and shade them with with crayons and water and fabric colors .you can stick the pictures of the terrace farming . doyou can do like this also