* Pineapple is a plant: Plants have a complex life cycle that includes both haploid and diploid phases.

* Pollen grains are haploid: Pollen grains are male gametes, meaning they carry half the number of chromosomes as a normal plant cell.

* Pineapple chromosome number: Pineapples have 50 chromosomes in their diploid cells.

* Therefore, a pineapple pollen grain has 25 chromosomes.

Let me know if you have any other questions!