Biology 3484A/B Lecture Notes - Lecture 20: Anemophily, Flowering Plant, Coevolution

• School: Western University
• Department: Biology
• Course: Biology 3484A/B
• Professor: Nina Zitani

Document Summary

Pollination: sexual reproduction, pollen = microscopic; contains male gametes; produced by male parts (stamens of flowers, transfer of pollen from male plant parts to female parts by fertilization, fertilization embryo seed. Pollination in angiosperms: most species need animals for pollination, flowers provide nectar and pollen (food) that attract animals, while animal is eating/gathering food, it pollinates flower by accident. Coevolution of angiosperms and animals: pollen transferred by animal, most pollinators are insects; most pollinators are bees. Evolution events: 400 mya; insects, 300 mya; beetles, plants: wind pollination or water required, (cid:1005)(cid:1007)(cid:1004) mya: first flowers, adaptive radiation of flowering plants and pollinating insects, (cid:271)ats: (cid:1009)(cid:1004)mya hu(cid:373)(cid:373)i(cid:374)g(cid:271)ird a(cid:374)(cid:272)estors: (cid:1008)(cid:1006)mya. Plants evolved flowers as means of attracting insects for their own purpose. Ovules become fertilized and develop into embryos then seeds (which are enclosed in fruit) **first flowers did not have nectar; pollen was the original food source. Fruits and seeds are the products of pollination that humans depend on.