Flower Reproduction

Angiosperms ,[object Object],the most widespread and diverse of all plants

Flowers increase reproductive success. color, shape, scent attract pollinators that increase likelihood pollen will be united with another flower

Some flowers are small and inconspicuous and therefore dependent on the wind for pollination. For example . . .

Pollen Grains ,[object Object],[object Object],[object Object],all three of these cells are haploid half the number of chromosomes for that species

Pollination: when pollen lands on a stigma tube cell grows a tube down through the style and into the ovary

sperm move through the tube and into the ovary

one sperm fertilizes an egg to form a diploid zygote that grows into an embryo plant

the other sperm fertilizes a special cell that develops endosperm

endosperm is food storage tissue that supports the embryo plant inside the seed

From pollination to fertilization can take an hour or days as the amount of time it takes for a sperm to travel through the pollen tube can vary.

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