Explanation:
Haploid plants can be produced by pollen culture. Plant tissue culture is culturing of plant parts including, seeds, explants, tissues, cells or protoplast on a synthetic medium under controlled environment of light, temperature and humidity. Cotyledon, embryo, and meristem are diploid in nature. So, these are not producing haploid plants. While pollen grains are male gamete of plants and haploid in nature.