An increase in biodiversity generally causes

An increase in the biodiversity of an ecosystem leads to an increase in its productivity. A variety of different mechanisms in nature help create diversity in organism populations.

Explanation:

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.