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AIM: SWBAT identify the different parts of the
seedPlease Do Now: What are the
sex cells called in plants? (Both male and female)
Agenda Do Now Seeds germinating video clips Parts of the Seed Powerpoint Reading / Annotation / Replant Seeds
What are seeds? 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
What parts do seeds have? 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
What is the embryonic plant?
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
What is the purpose of the endosperm?
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
What does the seed coat do?
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
Why aren’t all seeds the same size? 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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