Sunday, April 22, 2012

Reproduction

Stamen: The pollen-producing reproductive organ of a flower, consisting of an anther and a filament
Filament: The stalk portion of the stamen
Anther: the terminal pollen sac of a stamen, where pollen grains containing sperm-producing male gametophytes form
Carpel: The ovule-producing reproductive organ of a flower, consisting of the stigma, style, and ovary
Stigma: The sticky part of a flowers carpel, which receives pollen grains
Style: The stalk of a flowers carpel, with the ovary at the base and the stigma at the top
Ovary: The portion of a carpel in which the egg-containing ovules develop
Petal: A modified leaf of a flowering plant. Petals are the often colorful parts of the flower that advertise it to insects and other pollinators
Sepals: A modified leaf that helps enclose and protect a flower bud before it opens
Pollen: The fertilizing element of flowering plants, consisting of fine, powdery, yellowish grains or spores, sometimes in masses
Ovule: A structure that developes within the ovary of a seed plant that contains the female gametophyte
Double Fertilization: A mechanism of fertilization in angiosperms in which two sperm cells unite with two cells in the female gametophyte to form the zygote and endosperm

Steps of Reproduction:
  • the pollen lands on stigma,
  • the pollen tube grows to ovary,
  • the egg is fertilized,
  • the seed forms after fertilization,
  • then when the seed is ready, the seed is spreaded,
  • and then the seed lands somewhere and germinates and starts all over!

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