Which type of cell does not contain membrane-bound organelles?
Prokaryote
Eukarote
Virus

That would be the prokaryote. Viruses are technically not considered cells, and eukaryotes are characterized by membrane-bound organelles, so the answer you're looking for would be the prokaryote.

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.