Please answer the question.

Dear student
a) Method of stem cutting was not properly followed by farmer could be the reason.

b) Stem should be cut horizontally in furrow (not in uproght manner) as horizontal cutting will let the growth from nodal region.

c) Coleus, Dahlia and Chrysanthemum.

d) Sohan is a helpful, caring person as he helped farmer to overcome the problem of stem cutting.
Regards