In which country is the $IARI$ institute located?

The plant, which is used for studying hybrid vigour or heterosis is

Which widely grown variety of rice,developed by the International Rice Research Institute $(IRRI)$ in Manila,Philippines,helped solve the food crisis in Asia?

Which of the following steps of plant breeding is very tedious and time-consuming?

New varieties of plants are produced by ..........

When two genetically different individuals or lineages are crossed, the $F_1$ generation often displays superior traits compared to both parents. This phenomenon is called .....