External fertilization is a form of fertilization in which a sperm cell is united with an egg cell external to the body of the female. Thus, the fertilization is said to occur "externally". This is distinct from internal fertilization where the union of the egg and sperm occur inside the female after insemination through copulation. Categories: Biology stubs ... Schematic diagram of a sperm cell, showing the (1) acrosome, (2) cell membrane, (3) nucleus, (4) mitochondria, and (5) flagellum (tail) A sperm cell, or spermatozoon ( spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. ... For the video-related acronym, see OVA. A human ovum An ovum (or loosely, egg or egg cell) is a female sex cell or gamete. ... Female symbol Female is the sex of an organism, or a part of an organism, which produces egg cells. ... Internal fertilization is a form of animal fertilization of an ovum by spermatozoans within the body of an inseminated animal, whether female or hermaphroditic. ... Insemination is the introduction of semen into the genital tract of a female. ... It has been suggested that Mating be merged into this article or section. ...

Many aquatic animals reproduce by external fertilization, including fish, whose females spawn ova which are fertilized by the sperm that male fish secrete into the water. A terrestrial example of external fertilization is pollination of flowers of flowering plants. Animal environments are classified as either aquatic (water), terrestrial (land), or amphibious (water and land). ... This article is about biological spawning. ... Honeybee and bumblebee pollinating a Sedum telephium Pollination is an important step in the reproduction of seed plants: the transfer of pollen grains (male gametes) to the plant carpel, the structure that contains the ovule (female gamete). ... Clivia miniata bears bright orange flowers. ... Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also called angiosperms) are a major group of land plants. ...

In sexual reproduction, there must be some way of getting the sperm to the egg. Since sperm are designed to be motile in a watery environment, aquatic animals can make use of the water in which they live. In many aquatic animals such as coral or Hydra, eggs and sperm are simultaneously shed into the water, and the sperm swim through the water to fertilize the egg in a process known as broadcast fertilization. In many fish species, including salmon, the female will deposit unfertilized eggs in the substrate and the male will swim by and fertilize them. Water (from the Old English word wæter; c. ... // Headline text Headline text Headline text Headline text Bold text Orders Scleractinia Corals are gastrovascular marine cnidarians (phylum Cnidaria; class Anthozoa) existing as small sea anemone-like polyps, typically forming colonies of many individuals. ... HYDRA is a fictional terrorist organization in the Marvel Universe. ... A spermatozoon fertilising an ovum Fertilization (also known as conception, fecundation and syngamy) is fusion of gametes to form a new organism. ... The Chinook or King Salmon is the largest salmon in North America and can grow up to 58 long and 126 pounds. ... Male symbol Male is the sex of an organism, or a part of an organism, which produces sperm. ...

References

• University of Cincinatti Clermont College