KINGDOM PLANTAE

摘要: Publisher Summary Members of the plant kingdom develop from embryos—multicellular structures enclosed in maternal tissue. Because all plants form embryos, they are multicellular. Furthermore, because embryos products sexual fusion cells, potentially have a stage their life cycle. In stage, male cell (sperm nucleus, haploid) fertilizes female egg (embryo sac haploid). Many grow and reproduce ways that bypass two-parent fusion—all must evolved ancestors formed by fusion. Plants adapted primarily for on land, although many dwell water during part history. organisms most responsible land shallow marine environments transforming solar energy, water, carbon dioxide into photosynthate: food, fiber, coal, oil, wood, other forms stored energy. Some half million species been described. Two great groups—the nonvascular (informally called bryophytes, also Bryata, Pl-1 through Pl-3) vascular (Tracheata, Pl-4 Pl-12)—constitute kingdom. The chapter refers to 12 “phyla” kingdom, but “division” is term used some botanists instead “phylum.”