This factor becomes activated when exposed to ‘rough’ surfaces such as glassware or plaques and starts the ‘slower’ process of coagulation. a) christmas factor b) serotonin endothelial factor c) hageman factor d) tissue factor iii

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.