DENDROLOGY

Detailed explanation-1: -Gametes develop in the multicellular haploid gametophyte (from the Greek phyton, “plant”). Fertilization gives rise to a multicellular diploid sporophyte, which produces haploid spores via meiosis. This type of life cycle is called a haplodiplontic life cycle (Figure 20.1).

Detailed explanation-2: -Ferns and horsetails have two free-living generations: a diploid sporophyte generation (spore-producing plant) and. a haploid gametophyte generation (gamete-producing plant).

Detailed explanation-3: -A cell is said to be haploid if it possesses only one set of chromosomes. Haploid can also be used to refer to the number of chromosomes in the gametes which can either be eggs in females or sperm cells in males. The gametes in humans are haploid as they contain 23 chromosomes.

Detailed explanation-4: -This mature gametophyte life stage is haploid and by mitosis (division of cells with identical genetic information) produces gametes. These gametes are either egg or sperm cells.