............... is source of dwarfing gene in wheat.

Correct option is A

· Correct answer: (a) Norin 10
· Norin 10 is a variety of wheat that carries the dwarfing gene, which is used in modern wheat breeding programs to produce semi-dwarf wheat varieties with high yield potential.
Other options:
· (b) Kafir: Not a source of the dwarfing gene in wheat.
· (c) Dee-geo-woo-gen: While related to dwarfing genes, Norin 10 is the more well-known source.
· (d) Taxas: Not associated with dwarfing genes in wheat.