The FlowerThe Flower

What is the functionWhat is the function

of the flowerof the flower

for the plant?for the plant?

Reproduction of Flowering Reproduction of Flowering PlantsPlants

Accessory Flower PartsAccessory Flower Parts

A.A. Sepals – Sepals – leaf like, green structures that leaf like, green structures that encircle the flower stem beneath the encircle the flower stem beneath the petalspetals

B.B. Petals – Petals – leaf like, colorful structures leaf like, colorful structures arranges in a circle called a corolla arranges in a circle called a corolla around the top of a flower stemaround the top of a flower stem

Sepals and PetalsSepals and Petals

Kinds of FlowersKinds of Flowers

Complete – a flower that has all 4 organs Complete – a flower that has all 4 organs (sepals, petals, stamens and pistils)(sepals, petals, stamens and pistils)

Incomplete – a flower that lacks one or Incomplete – a flower that lacks one or more organsmore organs

Male – have stamens but no pistilsMale – have stamens but no pistils Female – have pistils but no stamensFemale – have pistils but no stamens

Reproductive Flower PartsReproductive Flower Parts

A.A. Stamen (male)Stamen (male) filament – the long structure that filament – the long structure that

supports the anthersupports the anther anther – the structure at the tip of the anther – the structure at the tip of the

filament that produces pollen containing filament that produces pollen containing spermsperm

Stamen and AntherStamen and Antherwith Pollenwith Pollen

POLLEN GRAINSPOLLEN GRAINS

A A pollen grainpollen grain is an is an

immature male gametophyte.immature male gametophyte.

Pollen grains arePollen grains are

extremely durable; extremely durable;

they have tough coats.they have tough coats.

B. Pistil (female)B. Pistil (female)stigmastigma – at the top of the pistil; a sticky or – at the top of the pistil; a sticky or

feathery surface on which the pollen feathery surface on which the pollen grains land and growgrains land and grow

stylestyle – the slender stalk of the pistil that – the slender stalk of the pistil that connects the stigma to the ovary connects the stigma to the ovary

ovaryovary – eventually becomes the fruit; – eventually becomes the fruit; contains the ovulescontains the ovules

ovulesovules – will become seeds if they are – will become seeds if they are fertilizedfertilized

The Female PistilThe Female Pistil

pistil

Name the Reproductive PartsName the Reproductive Partsof this Flowerof this Flower

Parts of FlowerParts of Flower

Use the diagram on Use the diagram on page 612 to draw a page 612 to draw a typical flower and typical flower and label the accessory label the accessory and reproductive and reproductive parts.parts.

MONOCOT ORMONOCOT ORDICOTDICOT

Count the petals or stamenCount the petals or stamenMonocots = flower parts in multiples of Monocots = flower parts in multiples of

33Dicots = flower parts in multiples of Dicots = flower parts in multiples of

4 or 54 or 5

Is this plant a monocot or a dicot? Is this plant a monocot or a dicot? How do you know? 5 petals How do you know? 5 petals

Is this plant a monocot or a dicot? Is this plant a monocot or a dicot? How do you know? How do you know?

3 petals, 3 sepals (or 6 tepals)3 petals, 3 sepals (or 6 tepals)