BIOL 1202 Lecture : 4/12/11 Bio Notes
Document Summary
Monocot: (e. g. corn)- seedlings each have 1 cotyledon (seed leaf); in monocots the cotyledon often remains within the conifers. Eudicot- (e. g. bean) seedlings each have 2 cotyledons (seed leaves) Plants have embryonic stem cells= stem cells throughout the entire life of the plant because they are always growing. Mery stem cells allow for branches to grow longer: allow them to regenerate all tissues and organs. Primary root is the first to appear: eudicot= tap root system, monocot= fibrous root system where all the roots cone from the base of the stem. Root hairs are extensions of epidermal ells: dramatically increase the surface area which helps absorb water and nutrients. Food storage is a function of all roots, but some (e. g. carrot taproots) are highly modified for storage: sugar stores in the form of starch. Above ground (aerial or prop) roots give extra support. Breathing roots conduct oxygen to waterlogged roots: knees of cyprus trees.
