BIO 11 - Flowering Plants (Angiosperm)

BIO 11 - Flowering Plants (Angiosperm) - BIO Lecture 11...

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BIO Lecture 11 – Flowering Plant 1. Most flowering plants have perfect flower (85%) advantage: outcross is an advantage but if cannot, self fertilize is sufficient. 2. Flower is basically a modified leaves: upon fertilization, the zygote develops. In most flowering plants, dispersal is helped by the covering of zygote by fruit (meat). flower serves as an attraction so that pollen can be transferred by pollinators (attracted) 3. Coevolution of plants and pollinators: a. wind pollination (ancestral) • Advantage: - don’t have to depend on insects (especially when the growing season is short) - spread widely • Difference between wind pollen and animal/insect pollen: wind pollen is light and small while animal/insect- pollen is sticky and heavy. b. animal pollination (newly evolved ): nectar is a reward in return to getting pollen • Advantage: - no need to depend on wind (so, this allowed colonization at whatever environment e.g. wet environment) - lower pollen produced and increased success of fertilization
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This note was uploaded on 04/25/2010 for the course BIOLOGY BIO153 taught by Professor Cordon during the Fall '10 term at University of Toronto- Toronto.

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BIO 11 - Flowering Plants (Angiosperm) - BIO Lecture 11...

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