Q.Explain the best suited type followed by plant breeders at present?

Step 1. Intravarietal hybridisation is limited to self-pollinated crops, restricting how widely it can be applied.

Step 2. Interspecific and intergeneric hybridisation, while valuable for transferring specific resistance traits, are explicitly described in the chapter as difficult, time-consuming and expensive, and prone to hybrid sterility — properties that limit their routine use. …

Compare the four hybridisation types' scope and practicality as described in the chapter to i …

• Picking interspecific or intergeneric hybridisation, which the chapter explicitly flags as harder, slower and prone to hybrid sterility, rather than the everyday practical choice. …