BIO 2137 Lecture Notes - Lecture 9: Cotyledon, Embryogenesis, Monophyly

• School: University of Ottawa
• Department: Biology
• Course: BIO 2137
• Professor: John Arnason

Document Summary

Plants and civilisation: the gift of diversity, we use very few species. Two main classes: liliopsida - monocotyledons monocots, magnoliopsida - eudicotyedones eudicots, more dicots than monocots. Palm trees: pri(cid:373)ar(cid:455) gro(cid:449)th due to (cid:862)pri(cid:373)ar(cid:455) thi(cid:272)ke(cid:374)i(cid:374)g (cid:373)eriste(cid:373)(cid:863) surrou(cid:374)di(cid:374)g apical meristem, e(cid:454)te(cid:374)ds do(cid:449)(cid:374) peripher(cid:455) of the ste(cid:373) a(cid:374)d (cid:862)se(cid:272)o(cid:374)dar(cid:455) thi(cid:272)ke(cid:374)i(cid:374)g (cid:373)eriste(cid:373)(cid:863, wood results from secondary growth, only monocot with true secondary growth. A flower: is a determinate shoot (with growth of limited duration, bears sporophylls modified leaves that bear sporangia. Angiosperm characters: inflorescence: cluster of flowers disposed in a definite pattern, an arrangement of flowers that occurs repetitively btwn many families. Stamen anatomy: anther: 4 sporangia borne on a filament. Fruit will not be formed unless the flower is fertilized: the carpel is a sporophylls folded lengthwise that bears and protects the ovules, placentation. 5: ovules originate and remain attached to the placenta until maturity, three carpals, parietal, axile, free central.