Study the table given below and identify a, b, c, d, e and f :
 

Crops	Variety	Resistance to disease
a	Pusa sadabahar	b
c	d	White rust
e	Himgiri	f

                                                            OR

What is plant breeding ? Explain the two steps involved in classical plant breeding.

                                                              OR

Plant breeding is done by the farmers to obtain the desired characteristics of a particular plant. The main purpose of plant breeding is to produce disease-resistant, high quality, and good yield plants.
Steps involved in classical plant breeding:
1. At first genetically variable plants are collected. This is called germplasm collection. 2. The germplasm is evaluated so as to identify plants with desirable combination of characters. The selected plants are multiplied. 

3. Then there is an artificial selection of plants with superior characters. These plants are chosen for further hybridization.

4.  Plants that have the desired character combination are selected among the progeny of the hybrids. These are self-pollinated for several generations till they reach a state of uniformity (homozygosity). 

5. These plants are grown in the research fields and their performance is recorded under ideal fertiliser application, irrigation, and other crop management practices. The evaluation in research fields is followed by testing the materials in farmers’ fields, for at least three growing seasons at several locations in the country, representing all the agroclimatic zones where the crop is usually grown. The material is
evaluated in comparison to the best available local crop cultivar – a check or reference cultivar.