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Published byBruce Harrison Modified over 6 years ago
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Plants can reproduce either asexually or sexually
Plant Reproduction Plants can reproduce either asexually or sexually
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Asexual Reproduction Occurs when one part of a plant develops into a separate new plant identical to the parent Adavantages: only takes one parent
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Sexual Reproduction Requires two parents organisms
Combines plant sperm & egg It’s a combination of both plants genetics
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Alternations of Generations
Plants have 2 life stages called generations The life cycle of an organisms alternates between diploid and haploid generations
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Diploid When you look at a tree or a flower you’re seeing the diploid generation The diploid generation begins with fertilization
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Haploid The haploid generation is tiny and lives surrounded by special tissues of the diploid plant There are haploid structures called spores
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Seedless plants Ferns and mosses grow form haploid spores
Not all plants grow from seeds
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Seed Plants Most land plants from seeds
In seed plants, pollination occurs when pollen grains land on the female reproductive structure of a plant of the same species
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Pistil ( stigma, style, ovary, ovule)
Female Pistil ( stigma, style, ovary, ovule) Male Stamen ( anther, filament)
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How pollen moves
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Watch Pollinators Insects like bees and ants birds Mice
Other small animals Watch
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watch Pollination Pollination occurs after pollen lands on the stigma
A pollen tube grows down the style to the ovary The pollen fertilizes the ovule A zygote develops into an embryo which becomes a seed watch
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Angiosperms vs. Gymnosperms
A flowering seed plant Flowerless seed plant Animals eat fruits and vegetables that come from angiosperms Not surrounded by fruit Alternation of generations
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Lets explore angiosperms
Watch
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