Chapter 31.1. Reproductive Structures of Flowering Plants. AP Biology Spring 2011. Floral Structure and Function. Flowers form on a modified branch of the sporophyte when master genes in the apical meristem are turned on . Floral Structure and Function.
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Reproductive Structures of Flowering Plants
Flowers form on a modified branch of the sporophyte when master genes in the apical meristem are turned on
Flower parts are arranged in whorls of modified leaves on the end of the receptacle
Sepals: outermost green, leaf-like parts arranged in a ring called the calyx
Petals: the coloured parts located between the reproductive structures and the sepals, arranged in a ring called the corolla
Stamens: male parts, slender stalk (filament) capped with an anther, inside which pollen sacs enclose pollen grains
Carpels: female parts, vessel shaped structures with an expanded lower ovary (with ovules), slender column (style), and an upper surface (stigma) for pollen landing
The egg and the sperm fuse to form the diploid zygote
As the zygote develops into a plant, the seed is formed
Complete flowers: have all four whorls (sepals, petals, stamens, and carpels)
Incomplete flowers: are missing one or more whorls
Perfect flowers: have both stamens and carpel (both sexes on one flower)
Imperfect flowers: produce either stamens or carpels and are known as either “male” or “female” flowers