Question

explain any two method of improving crop variety​

Answer 1

Two methods for increasing crop variety are:-

1)Use of fertilisers and pesticides.

2)Use of bio-technology process.

Answer 2

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primary introduction:-

Introduced plant is released directly for cultivation as a variety, for e.g., Introduction of Wheat varieties ‘Lerma Rojo’ and ‘Sonora 64’ in our country from Mexico in early 1960s; IR8 and Jaya varieties of rice.

Secondary introduction:

Introduced material is used for selection or for hybridization with the indigenous germplasm to bring about the desired improvement to make it suitable for cultivation for e.g., wheat variety ‘kalyan sona’ and ‘sonalika.’

Crop Improvement Method# 2. Acclimatization:

Acclimatization follows the introduction and both processes go side by side. Acclimatization is the adaptation or adjustment of an individual plant or a population of plants under the changed climate for a number of generations: Thus, it is a sort of natural selection operating into the introduced plant material.