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FLOWER ORGANSFLOWER ORGANS

Biology - 23.2Biology - 23.2

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PLANT ORGANSPLANT ORGANSSome flower organs are responsible for support or function, but others function in a reproductive role.

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PLANT ORGANSPLANT ORGANSIn general, flowers have four organs:1)Sepals2)Petals3)Stamens4)Pistils – one or more.

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PLANT ORGANSPLANT ORGANSSEPALSSepals protect the flower bud and can look like small leaves or even resemble the flower’s petals.

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PLANT ORGANSPLANT ORGANSPETALSPetals are usually colorful structures that can both attract pollinators and provide them with a landing platform.

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PLANT ORGANSPLANT ORGANSSepals and petals, if present, are attached to a flower stalk, called a peduncle.

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PLANT ORGANSPLANT ORGANSMost flowers have several stamens – the male reproductive organs.

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PLANT ORGANSPLANT ORGANSStamens are composed of two parts:1) Filament-supports the anther2) Anther-Forms the pollen grains.

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PLANT ORGANSPLANT ORGANSThe female reproductive part of the flower is the pistil, located in the center of the flower.

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PLANT ORGANSPLANT ORGANSThe pistil usually has three parts:1)Stigma – tip of the pistil. This is where pollination occurs.2)Style – Part that connects the stigma to the ovary3)Ovary – contains one or more ovules which is where the egg forms.

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PLANT ORGANSPLANT ORGANSSTRUCTURAL DIFFERENCESFlowers that have sepals, petals, stamens, and one or more pistils are called complete flowers.

If one is missing, it is an incomplete flower.

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PLANT ORGANSPLANT ORGANSPollination mechanisms

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PLANT ORGANSPLANT ORGANSPollination mechanisms1)Animal pollination – insects or other small animals (bats, birds) move from flower to flower searching for nectar.2)Wind Pollination3)Self Pollination