Chapter 24 Reproduction in Seed Plants Unit 7--Plants Chapter 24 Reproduction in Seed Plants

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Flower Parts (non-essential) Sepals (outermost, leaf-like) for protecting inner parts Calyx = all sepals together Petals (colorful, with nectar) to attract pollinators which see different patterns in ultraviolet light Corolla = all petals together

What we see… NECTER GUIDES What they see:

What we see… What they see:

What we see… What they see:

Flower Parts (essential) Stamens (male reproductive organs) filaments = slender stalk supporting… anther = produce pollen (containing sperm) Pistils (female reproductive organs) stigma = sticky top to catch pollen style = slender stalk supporting… ovary = base contains ovules -> eggs & later houses seeds

Fruit = ripened ovary & associated parts

Flower to Fruit After Pollination… Petals & stamens dry and fall off Within ovary, seeds develop in ovules… Ovary becomes “core” of the apple Receptacle swells around ovary… Receptacle becomes fleshy part of fruit Calyx forms “crusty” bottom of apple Sepals dry, but don’t fall off…

ovary cross section showing ovules

Fruit = for seed dispersal

Seeds Seed coat = to protect embryo (softens when wet) Nutrients = endosperm (monocots) & fleshy cotyledons (dicots) Embryo plant (attached to cotyledon) radicle = embryonic root hypocotyl = embryonic stem epicotyl = embryonic shoot (or bud) plumule = embryonic leaves

(leaves) Hypocotyl (stem) Epicotyl (shoot)