Amount of pollen grains per each kernel produced by a maize tassel is at least

Answer: Option D

The amount of pollen grains per kernel produced by a maize tassel is at least 25000.
Tassels are relatively large inflorescences and produce many flowers. Estimates of pollen grain production range from 2 to 25 million pollen grains per tassel.
97% or more of the kernels produced by each plant are pollinated by other plants in the field. Each tassel contains as many as 2 million or more pollen grains, which translates to at least 2,000 pollen grains produced for each silk of the ear shoot.