BIOL 1011 Lecture Notes - Lecture 2: Gametophyte, Cuticle, Wollemia
2 Feb 2015
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*the role of gametophytes is to make gametes. Douglas fir, juniper, wollemi pine, sequoia, larch, bristlecone pine. Monocots: grasses (maize, wheat, rice, bamboo), orchids, irises, lilies, palms. Single hole to allow pollen to germinate from. Eudicots: oaks, maples, dandelions, sunflowers, legumes, melons, potatoes, poppies, roses. 3 holes to allow pollen to germinate from. Male and female sex organs within a flower. 85% of angiosperm species (cosexual or hermaphrodite flowers) Definition: arrival of pollen on stigma (flowering plants) or on receptive female cone (conifers) Flowering plants: insects (bees, moths, butterflies, flies, beetles), birds (hummingbirds), bats, wind. Reward for pollinator: nectar (sugar water), pollen. Advertisement by plant: showy flower, possibly odorous. 8 cells: 2 come together to form central cell: 7 cells + 8 nuclei. Discharge 2 sperm that are functional (which is unique for flowering plants: only plant cells without cell walls: actually nuclei without cell walls, one unites with egg, other with central cell to make endosperm (1m+2f=3n)
