4A stamen is the male structure of the flower. filamentantheranther produces pollen grainsfilament supports the anther
5The innermost layer of a flower is the female carpel. stylestigmaovarystigma is sticky tipstyle is tube leading from stigma to ovaryovary produces female gametophyte
6Flowering plants can be pollinated by wind or animals. Flowering plants pollinated when pollen grains land on stigma.Wind pollinated flowers have small flowers and large amounts of pollen.
7Animal pollinated flowers have larger flowers and less pollen. many flowering plants pollinated by animal pollinatorspollen grainspollination occurs as animal feeds from flower to floweranimal pollination more efficient than wind pollination
8Fertilization takes place within the flower. Male gametophytes, or pollen grains, are produced in the anthers.male spores produced in anthers by meiosiseach spore divides by mitosis to form two haploid cellstwo cells form a single pollen grainpollen grain
9One female gametophyte can form in each ovule of a flower’s ovary. four female spores produced in ovule by meiosisone spore develops into female gametophytefemale gametophyte contains seven cellsone cell has two nuclei, or polar nucleione cell will develop into an egg
10Pollination occurs when a pollen grain lands on a stigma. pollen tubespermstigmaone cell from pollen grain forms pollen tubeother cell forms two sperm that travel down tube
11Flowering plants go through the process of double fertilization. femalegametophyteovuleeggspermpolar nuclei
12Flowering plants go through the process of double fertilization. endospermseed coatembryoone sperm fertilizes the eggother sperm unites with polar nuclei, forming endospermendosperm provides food supply for embryo
13Each ovule becomes a seed. The surrounding ovary grows into a fruit.