BIO1011 Lecture Notes - Lecture 21: Vascular Plant, Vascular Tissue, Microphyll
6 Aug 2018
School
Department
Course
Professor
Document Summary
Unicellular in their initial stage and grows when the conditions were right and became multicellular where it could be either female or male moss. Fe(cid:396)tilisatio(cid:374) the(cid:374) o(cid:272)(cid:272)u(cid:396) (cid:449)he(cid:374) the(cid:455)(cid:859)(cid:396)e immersed in aquatic environment and become diploid. Multicellular sporophytes provide, on average greater spore production and thus more widespread dispersal from each successful formation of a zygote. Hornworts have a long lived, photosynthetic sporophyte and gametophytes are still dominant. Intercalary growth (happens on the base of horn warts) Three key evolutionary innovations during land plant evolution: Stomata: plants need gas exchange and happens in the leaves to prevent from drying out, stomata have evolved. For stomata to open, there is an enormous loss of water. In low water environment, stomata open and cause the plant to be turgid. Sporophytes: more persistent as can be seen in hornworts. Vascular tissue: more availability of light in terrestrial environment.
