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From Wikipedia

Female reproductive system (human)

The female reproductive system (or female genital system) contains two main parts: the uterus, which hosts the developing fetus, produces vaginal and uterine secretions, and passes the male's sperm through to the fallopian tubes; and the ovaries, which produce the female's egg cells. These

Ovary (plants)

In the flowering plant s, an ovary is a part of the female reproductive organ of the flower or gynoecium. Specifically, it is the part of the pistil which holds the ovule(s) and is located above or below or at the point of connection with the base of the petals and sepals. The pistil may

Sexual reproduction

Sexual reproduction is the creation of a new organism by combining the genetic material of two organisms. The two main processes are: meiosis, involving the halving of the number of chromosomes; and fertilization, involving the fusion of two gametes and the restoration of the original number of chromosomes. During meiosis, the chromosomes of each pair usually cross over to achieve homologous recombination.

The evolution of sexual reproduction is a major puzzle. The first fossilized evidence of sexually reproducing organisms is from eukaryotes of the Stenian period, about 1 to 1.2 billion years ago. Sexual reproduction is the primary method of reproduction for the vast majority of macroscopic organisms, including almost all animals and plants. Bacterial conjugation, the transfer of DNA between two bacteria, is often mistakenly confused with sexual reproduction, because the mechanics are similar.

A major question is why sexual reproduction persists when parthenogenesis appears in some ways to be a superior form of reproduction. Contemporary evolutionary thought proposes some explanations. It may be due to selection pressure on the clade itself—the ability for a population to radiate more rapidly in response to a changing environment through sexual recombination than parthenogenesis allows. Alternatively, sexual reproduction may allow for the "ratcheting" of evolutionary speed as one clade competes with another for a limited resource.

Plants

Animals typically produce male gametes called sperm, and female gametes called eggs and ova, following immediately after meiosis, with the gametes produced directly by meiosis. Plants on the other hand have mitosis occurring in spores, which are produced by meiosis. The spores germinate into the gametophyte phase. The gametophytes of different groups of plants vary in size; angiosperms have as few as three cells in pollen, and mosses and other so called primitive plants may have several million cells. Plants have an alternation of generations where the sporophyte phase is succeeded by the gametophyte phase. The sporophyte phase produces spores within the sporangium by meiosis.

Flowering plants

Flowering plants are the dominant plant form on land and they reproduce by sexual and asexual means. Often their most distinguishing feature is their reproductive organs, commonly called flowers. The anther produces male gametophytes, the sperm is produced in pollen grains, which attach to the stigma on top of a carpel, in which the female gametophytes (inside ovules) are located. After the pollen tube grows through the carpel's style, the sex cell nuclei from the pollen grain migrate into the ovule to fertilize the egg cell and endosperm nuclei within the female gametophyte in a process termed double fertilization. The resulting zygote develops into an embryo, while the triploid endosperm (one sperm cell plus two female cells) and female tissues of the ovule give rise to the surrounding tissues in the developing seed. The ovary, which produced the female gametophyte(s), then grows into a fruit, which surrounds the seed(s). Plants may either self-pollinate or cross-pollinate. Nonflowering plants like ferns, moss and liverworts use other means of sexual reproduction.

Ferns

Ferns mostly produce large diploid sporophytes with rhizomes, roots and leaves; and on fertile leaves called sporangium, spores are produced. The spores are released and germinate to produce short, thin gametophytes that are typically heart shaped, small and green in color. The gametophytes or thallus, produce both motile sperm in the antheridia and egg cells in separate archegonia. After rains or when dew deposits a film of water, the motile sperm are splashed away from the antheridia, which are normally produced on the top side of the thallus, and swim in the film of water to the antheridia where they fertilize the egg. To promote out crossing or cross fertilization the sperm are released before the eggs are receptive of the sperm, making it more likely that the sperm will fertilize the eggs of different thallus. A zygote is formed after fertilization, which grows into a new sporophytic plant. The condition of having separate sporephyte and gametophyte plants is called alternation of generations. Other plants with similar reproductive means include the Psilotum,Lycopodium,SelaginellaandEquisetum.

Bryophytes

The bryophytes, which

Sex organ

A sex organ, or primary sexual characteristic, as narrowly defined, is any of the anatomical parts of the body which are involved in sexual reproduction and constitute the reproductive system in a complex organism; flower s are the reproductive organs of flowering plant s, cone s are the


From Yahoo Answers

Question:What are the organs in a female reproductive system?? Plz help

Answers:ovary cervix vagina uterus fallopian tube there's more organs but I don't have more to put

Question:prepares an ovum and ovulation: prepares itself to nourish and protect a feretilized egg: passageway through which the egg travels on its trip to the uterus: site of fertilization: what are the 2 functions of the female reproductive system? 1. 2.

Answers:To balance hormones levels and to reproduce I guess.

Question:2. The flower attaches to what part of the plant? 3. Why are flowers brightly colored? 4. Name two mammals that might pollinate a plant. 5. If the petals of a flower are reduced or absent, how is the plant pollinated? 6. The female reproductive structures are called the: 7. Name the three parts of the pistil: 8. Where are the ovules stored? 9. Name the two parts of the stamen: 10. Describe sexual reproduction in plants. 11. The ovary develops into what structure? 12. Define fruit. 13. Some flowers are not brightly colored at all, but have a very pungent odor that smells like rotting meat. How do you think these flowers are pollinated? 14. In many flowers, the pistils and stamens reach maturity at different times. Considering what you know about pollination, why would this be an advantage to the plant?

Answers:2.receptacle 3To attract animals; insects birds,spiders 4Herbivores like woodchuck,chipmonk, deer 5 usually wind 6pistal 7stigma,style,ovary 8in the ovary 9filament,anther 10. The details get a bit complex. Overall; Pollination; pollen carried from anther to stigma; sperm nuclei germinates out of pollen grain, goes down style into ovule and fertilizes egg nuclei ("double fertilization" occurs), Seed develops from ovule and fruit develops from ovary. Next seed is dispersed. 11fruit (the ovule turns into a seed) 12a ripened ovary 13scavengers (the common housefly would like these flowers) 14prevent self pollination p.s. I feel a little guilty doing your homework for you (:

Question:oak tree questions. male + female parts. reproduction etc.? okay i found an oak with little strands of flower thingies dripping down. there are the leafs also. i need to know which part is the male and which is the female. how the reproduce and facts about that stuff . thankkkks a milli Category

Answers:Female flowers appear first and are yellowish; male flowers are reddish, and show up a week or so later.