What is a radical? in biology

Radical is an atom or a group of atoms of different elements that act as a single unit during chemical reaction.

Explanation:

For example: Hydrogen, Nitrogen,Nitride,Nitrate,Ammonium, etc.

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.

4tghyjuklertghyjukl