Search results
Results from the WOW.Com Content Network
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. [1] 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. [2]
Examples of External Fertilization. The examples of external fertilization are given below: Sea Urchins. They use chemotaxis to attract the sperms towards the eggs. Their spawning is synchronized to prevent the eggs and sperms from diluting or drifting away. Frogs. The female releases the eggs into the water.
Many different animal species are oviparous, some of which perform internal fertilization (e.g. birds) and others external fertilization (e.g. fish). These are good examples of the differences between internal and external fertilization as the eggs of each species are adapted according to the process.
What are the 5 Examples of External Fertilization Animals? Examples of animals that reproduce via external fertilization include fish, amphibians, mollusks, echinoderms, and many marine invertebrates like corals and sea urchins.
External fertilization is characterized by the release of both sperm and eggs into an external environment; sperm will fertilize the egg outside of the organism, as seen in spawning.
Descriptive external fertilization examples are that of salmon, trout fish, and codfish. Both the female and male release their eggs and sperms respectively into the water where they diffuse and fertilize. In the list of external fertilization examples, aquatic animals such as mammals and sharks are exceptions. Features of External Fertilisation:-
External Fertilization. External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. After the sperm reaches the egg, fertilization takes place.
Most external fertilization happens during the process of spawning where one or several females release their eggs and the male (s) release sperm in the same area, at the same time. The release of the reproductive material may be triggered by water temperature or the length of daylight.
External fertilisation is a method of reproduction in which a male organism’s sperms fertilise a female organism’s eggs, but outside the female body. This process is precisely opposite to internal fertilisation. In internal fertilisation, sperms combine with eggs via insemination within the female body.
External fertilization in animals usually occurs in water or in damp areas in a process called spawning. Moisture in the environment keeps the gametes from drying out. Moisture is also important so the eggs and sperm can move around freely, which lets them meet and fuse.