What does external fertilization mean?

Definitions for external fertilization
ex·ter·nal fer·til·iza·tion

This dictionary definitions page includes all the possible meanings, example usage and translations of the word external fertilization.


  1. External fertilization

    External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism. External fertilization typically occurs in water or a moist area to facilitate the movement of sperm to the egg. The release of eggs and sperm into the water is known as spawning. In motile species, spawning females often travel to a suitable location to release their eggs. However, sessile species are less able to move to spawning locations and must release gametes locally. Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce. Environmental factors and timing are key challenges to the success of external fertilization. While in the water, the male and female must both release gametes at similar times in order to fertilize the egg. Gametes spawned into the water may also be washed away, eaten, or damaged by external factors.


  1. External fertilization

    External fertilization is a strategy of fertilization in which a sperm cell unites with an egg cell in the open, rather than inside specialized organs within the bodies of the parents. In contrast, internal fertilization takes place inside the female after insemination through copulation. In sexual reproduction, there must be some way of getting the sperm to the egg. Since the morphology of sperm in most species is adapted to mobility in suitably watery liquids, the sperms of aquatic animals take advantage of the water in which they live, and reach the egg by swimming. Typically such sperms have one or more flagella and in some species they are streamlined. Hardly any plants make use of external fertilization, except for a minority of aquatic non-vascular plants such as algae; vascular plants retain the ova in the parental body till after fertilisation. In many aquatic animals such as coral and 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. Among vertebrates most species of fishes and amphibia reproduce by external fertilization, but the details vary widely.

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  1. Chaldean Numerology

    The numerical value of external fertilization in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of external fertilization in Pythagorean Numerology is: 2

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"external fertilization." Definitions.net. STANDS4 LLC, 2024. Web. 21 May 2024. <https://www.definitions.net/definition/external+fertilization>.

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