BIOL 2P93 Lecture Notes - Lecture 3: Sieve Tube Element, Xylem, Vascular Cambium
Document Summary
Bryophytes have free living noticeable gametophytes that sporophytes are permanently attached to, and nutritionally dependent on the gametophyte. Bryophytes emphasized gamete-producing generations and the need for water to help its sperm swim to eggs as a means for dominating the landscape: this accounts for their small size and ground-hugging form. Vascular land plants have sporophytes that are more noticeable than gametophytes and are free living. Water is not necessary for vascular land plant reproduction: water is required in some primitive seedless vascular plants, but not in gymnosperms and angiosperms. Vascular land plants with seeds can live anywhere. Vascular land plants changes the biosphere significantly allowing for the development of terrestrial animal life. The oldest known vascular land plant is cooksonia spp: first discovered in 1937 in great britain, and dated from late silurian (414 to 408 mya) until the end of early devonian (433 to 393 mya) Primitive vascular land plants during the early devonian period consist of small.