A flower has 26 chromosomes. To create a new flower how many chromosomes would a sperm cell have, what is this process called 2

13 chromosomes, meiosis

Explanation:

the sperm cell contributes half of the chromosome in an offspring while the egg cells contributes the other half. Hence, the sperm cell has half of 26, 13. This process is called meiosis. Meiosis is when one cell undergoes cell division twice, thus creating 4 new cells. Each of these 4 new cells have half the amount of chromosomes as the original cell.