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Published byLoraine Bryan Modified over 9 years ago
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Please Do Now: What are the sex cells called in plants? (Both male and female)
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Do Now Seeds germinating video clips Parts of the Seed Powerpoint Reading / Annotation / Replant Seeds
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A seed is an embryonic plant It has the potential to develop into a full plant Its small size and independence of the parent plant allow it to be dispersed long distances, and establish itself nowhere near the parent plant
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Seeds result from the fertilization of the ovule with sperm from the pollen Most seeds consist of three main parts: An embryonic plant A store of resources A seed coat
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The embryonic plant is a tiny but already formed version of the mature plant The embryonic leaves are called cotyledons The already formed root = radicle Already formed shoot (aboveground stem) is the plumule Hypocotyl = below the cotyledon Epicotyl = above the cotyledon
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The new plant will have to grow a bit before it can photosynthesize on its own. it has to have storage reserves to live off of reserves are found in the endosperm, include fats, starch, and protein The size of the endosperm can vary widely
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The outermost layer of the seed Protects the embryo from mechanical damage and drying out Varies widely species to species depending on the stresses the embryo is likely to face
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big seeds = more storage, better chance of survival, higher investment, less produced Small seeds = less storage, lower survival, lower investment, more produced
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