Life CyclesToday we will observe life cycles through a

flower dissection…our goal is to see how the structure of the flower aids in the function of

reproduction!

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Basic Life Cycle of A Sexual Organism

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Plants have sex too!

• Flower--Reproductive organ

• Perfect flowers have male and female parts

• Anther and Filament--Male

• Stigma and ovary--female

• What are the petals for?

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Do plants reproduce asexually too?

• Potatoes

• Why did this lead to the potato famine?

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When is sex important?

• In times of stress• Mixes up genes and

comes up with new (maybe better) combinations!

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What are we going to figure out today?

• What mechanisms plants have to ensure cross-pollination?– Timing

– Structure of reproductive parts

• We will do this by– Looking at old and new

flowers

– Compare lengths of male and female parts

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