(a) What is green revolution ? Mention the steps that led to it
(b) Name the scientist whose contribution led to the development of semi-dwarf wheat varieties in India.

Explanation

(a) Green revolution refers to a set of research and development of technology that increased agricultural production worldwide, particularly in the developing world.
The initiatives resulted in :
(i) High-yielding and disease rasistant varieties in wheat, rise, maize etc.
(ii) Expansion of irrigation infrastructure, modernization of management techniques, distribution of hybridized seeds, synthetic fertilizers etc.
(b) Norman Borlaug, the Nobel Laureate contributed for wheat and maize improvement in Mexio and developed semi-dwarf wheat varieties.