BIO 1002 Chapter 24 Plant Reproduction

BIO 1002 Chapter 24 Plant Reproduction - Chapter 24: Plant...

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Chapter 24: Plant Reproduction and Development Lots of bats are nectar feeders A. Asexual Reproduction 1. By fragmentation, either naturally (runners: modified stems) or artificial (clippings) a. Strawberries, ferns, etc… B. Sexual reproduction 1. Combines genes from 2 different parents, offspring genetically different 2. Alternation of generations a. Seeded plants have 2 types of spores (like male and female) 1) Megaspores : give rise to female gametophyte – an embryo sac containing an egg cell 2) Microspores : give rise to male gametophytes – pollen grains (sperm); produced by meiosis 3) A flower has male parts and female parts (tube); the sperm cells land on the pollen tube and sends down the nuclei C. Evolution of Land Plants both seed plants 1. Gymnosperms (earliest seed plants) ex: male pine cones a. Wind pollination used for fertilization 1) Advantage: doesn’t require any biological help (ants, birds, wasps) 2) Disadvantage: it’s an inefficient process much of the pollen is lost and doesn’t allow a wide distance for spreading b. Insects started carrying pollen grains from male to female plants ~150 million years ago c. Plants enticed insects with food in the form of pollen (protein rich) and female cones (sugar rich) 2. Angiosperms - flowering plants a. Natural selection they were more successful at reproduction because of the attraction of insects
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BIO 1002 Chapter 24 Plant Reproduction - Chapter 24: Plant...

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