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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

Chapter 31.1

Reproductive Structures of Flowering Plants

AP Biology

Spring 2011

floral structure and function
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 function3
Floral Structure and Function

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

floral structure and function4
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

floral structure and function6
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

floral structure and function7
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
floral structure and function8
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

diversity in flower structure
Diversity in Flower Structure

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

Incomplete flowers: are missing one or more whorls

diversity in flower structure10
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