BSC-1005 Lecture Notes - Lecture 4: Seed Dispersal, Pseudocopulation, Pollination
Document Summary
Pollination brings male and female reproductive cells together w/i a flower (which is an adaptation specifically for pollination: wind pollination does not require animals (ex. corn, wheat, rice) A. 3. no or small petals, large stigmas, lots of pollen not efficient, but effective separate male & female flowers: animal pollination (85%) B. 1. flowers provide an attractant (petals, color, scent) + a reward (nectar, pollen) B. 1. a) bees + butterflies = mostly generalists (visit many flowers) (b. 1. a. 1) bees like blue + yellow and need a landing platform (b. 1. a. 2) butterflies like similar flowers. B. 1. b) hummingbirds = have poor sense of smell, like red flowers w/ lots of nectar. B. 2. nectar tubes (at bottom is where reward is) self-pollination vs. cross-pollination. No genetic variation, uniform (--> less chance of survival) Guarantees genetic variation (required to adapt to environmental changes) Seed dispersal occurs after fertilization (when the ovule >seed & ovary wall >fruit: occurs by wind, water, animals.