Protandry are found in

Solution(By Examveda Team)

Protandry is found in both Maize and Sugarbeet.
Protoandry is the condition in which an organism begins life as a male and then changes into a female. The condition of flowers whose male parts mature before the female ones, or the arrival of males before females at a mating site.
Maize is generally protandrous, that is, the male flower matures earlier than the female flower.
The primary method of pollination in sugarbeet is cross pollination due to the lack of synchrony between pollen release and receptiveness of the stigma, a condition of protoandry.