Which one shows meiosis?

Pollen grain shows meiosis.
Microsporogenesis in the anther involves the meiotic division of pollen mother cells, which each produce four microspores.
Meiosis occurs in the anthers. Cells called pollen mother cells to undergo meiosis. If a plant is diploid, each haploid product of meiosis (unicellular microspore) divides mitotically, but asymmetrically, to give two haploid cells.