AP BIOLOGY

Detailed explanation-1: -Plants have two distinct stages in their lifecycle: the gametophyte stage and the sporophyte stage. The haploid gametophyte produces the male and female gametes by mitosis in distinct multicellular structures. Fusion of the male and females gametes forms the diploid zygote, which develops into the sporophyte.

Detailed explanation-2: -Unlike animals(see Chapter 2), plants have multicellular haploid and multicellular diploid stages in their life cycle. 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.

Detailed explanation-3: -The plant life cycle consists of four stages; seed, sprout, small plant, and adult plant.

Detailed explanation-4: -Like all plants, the bryophyte life cycle goes through both haploid (gametophyte) and diploid (sporophyte) stages.

Detailed explanation-5: -In plants, alternation of generations exists, where the members have haploid and diploid phases. The plant’s haploid phase is called gametophyte and the diploid phase is called the sporophyte.