01:119:115 Lecture Notes - Lecture 30: Pollen Tube, Megaspore, Sporophyte

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: A Keating

Document Summary

Chapter 30 - plant diversity ii: the evolution of seed plants. Chapter 30 plant diversity ii: the evolution of seed plants. Near east, east asia, africa, and the americas: this was the single most important cultural change in the history of humanity, and it made possible the transition from hunter-gatherer societies to permanent settlements. In contrast to the few species of heterosporous seedless vascular plants, seed plants are unique in retaining their megaspores within the parent sporophyte. Co(cid:374)(cid:272)ept (cid:1007)0. (cid:1006) gy(cid:373)(cid:374)osper(cid:373)s (cid:271)ear (cid:862)(cid:374)aked(cid:863) seeds, typi(cid:272)ally o(cid:374) (cid:272)o(cid:374)es: the ovules and seeds of gy(cid:373)(cid:374)osper(cid:373)s (cid:894)(cid:862)(cid:374)aked seeds(cid:863)(cid:895) de(cid:448)elop o(cid:374) the surfa(cid:272)es of (cid:373)odified leaves that usually form cones (strobili). In contrast, ovules and seeds of angiosperms develop in enclosed chambers called ovaries: the most familiar gymnosperms are the conifers, cone-bearing trees such as pine, fir, and redwood. The four phyla of extant gymnosperms are cycadophyta, ginkgophyta, gnetophyta, and.