Transcript Seed Development and Germination

WARM UP
“A weed is but an unloved flower.”
–Ella Wheeler Wilcox
1. What does this mean to you?
2. How does this apply to plants and
reproduction?
Seed Development and
Germination
Ovules
• Ovule has an embryo, endosperm, and coverings
– Gets nutrients from plant
Seeds
• When coverings thicken and seal, food is
stored and seed is formed.
– Seed coat, endosperm, embryo
Seeds
• Cotyledons
– Part of the embryo that absorbs nutrients from
endosperm so growth can occur
Fruit
• Ovary ripens as ovule develops
• Eventually, fruit surrounds seeds
Fruit Types
• Dry Fruits
– Legume
– Achene
– Nut
– Samara
– Caryopsis
• Fleshy Fruits
– Drupe
– Hesperidium
– Pepo
– Pome
– Aggregate
– Multiple
Fruit Types
Germination
• Seeds take in water, swell, and rupture
– Seed coat broken by scratching, freezing, fire, etc.
• More oxygen, more cell division
• Primary root emerges 1st, then shoot
WRAP UP
• Name 3 “vegetables” that are
actually fruits.
• Name 3 vegetables that are truly
vegetables.