BIOL108 Lecture Notes - Lecture 3: Pollen Tube, Coconut Water, Endosperm

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Richard Moses

Document Summary

Huge diversification in cenozoic era (65 to 5 mya: derived characteristics of angiosperms: Ancestral flower condition: 4 layers of modified leaves. Difference with gymnosperm: no ovary and naked seeds/ovules in gymnosperm. Pollen lands on stigma: tube cell: pollen tube; generative cell: 2 sperm. Another fuse with both polar nuclei (n+n+n), forms endosperm nucleus. Examples of endosperm: nuts, coconut water, rice, corn. Attract insects to eat the fruit and poop seeds out. Sometimes can come from the sepal, mostly from ovaries (sometimes ovaries dry out) Many cultivated fruits have been hugely changed through artificial. Asexual reproduction in sweet bananas: life cycle of an angiosperm: Pollination (pollen-microgametophyte transfer from stamen to a stigma) Mode: 80% angiosperm species rely on animals for pollination. Many angiosperms are highly specialized for one pollinator species. Dar(cid:449)i(cid:374)(cid:859)s ha(cid:449)k (cid:373)oth a(cid:374)d stat orchid (madagascar)- there is a tube. The function of nectary is to attract animal.