Organisms displaying different phenotypes at different environments are an example of

The answer is phenotypic plasticity. An organism will change its behavior, morphology, or physiology in response to changes in the environment. This is a more or less ‘immediate’ non-permanent state adopted without any changes in the genetic makeup of the organism.   An example is tropism response to environmental stimuli in plants.

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.