Nonvascular Plants - Plants
without water and nutrient conducting systems
Vascular
Plants - Plants with water and nutrient
conducting systems
Plants most likely evolved more than 430 million years ago from multicellular green algae. Currently there are over 266,000 known species in the world. The plant kingdom differs from the others in several important ways. All plants are eukaryotic, multicellular, and contain a cell wall made of cellulose and other polysaccharides. The life cycle exhibits alternation of generations of diploid sporophytes and haploid gametophytes. Sporophytes produce haploid spores through meiosis. From these spores, gametophytes are formed and eventually produce gametes (egg and sperm) by mitosis. The gametes fuse to form the sporophyte, thus completing the life cycle.
Plantae is divided into 2 groups:
Nonvascular Plants - Plants
without water and nutrient conducting systems
Vascular
Plants - Plants with water and nutrient
conducting systems