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