Superiority of F1's over the better parent is called as -

Correct option is C

· Correct answer: (c) Heterobeltiosis
· Heterobeltiosis refers to the phenomenon where the F1 hybrid exhibits superiority over the better parent, rather than the average or both parents.
Other options:
· (a) Male sterility: Refers to the absence of male function in a plant, not hybrid vigor.
· (b) Standard heterosis: Refers to F1 superiority over the average of both parents, not specifically over the better parent.
· (d) Average heterosis: Refers to F1 superiority over the average of both parents.