Why onion cells dont have chloroplasts.

Explanation:

The edible part of onion ( or bulb ) has no chlorophyll because it's present underground & it doesn't performs photosynthesis as sunlight is not available for the bulb. But the shoot part of the onion ( which grows up ) is green and has chlorophyll in it because it performs photosynthesis.

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.