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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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Chapter 31.1

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Chapter 31 1 l.jpg

Chapter 31.1

Reproductive Structures of Flowering Plants

AP Biology

Spring 2011


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Floral Structure and Function

Flowers form on a modified branch of the sporophyte when master genes in the apical meristem are turned on


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Floral Structure and Function

Flower parts are arranged in whorls of modified leaves on the end of the receptacle


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Floral Structure and Function

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


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Floral Structure and Function

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


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Floral Structure and Function

  • Meiosis of cells within flowers produces haploid spores

    • Microspores in the anther

    • Megaspore in the ovule

  • They then undergo mitosis to produce the haploid gametophytes that ultimately become the egg or sperm


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Floral Structure and Function

The egg and the sperm fuse to form the diploid zygote

As the zygote develops into a plant, the seed is formed


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Diversity in Flower Structure

Complete flowers: have all four whorls (sepals, petals, stamens, and carpels)

Incomplete flowers: are missing one or more whorls


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Diversity in Flower Structure

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


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