External Fertilization occurs when an organism fertilised outside the body.
External Fertilization occurs when an organism fertilised outside the body. The process of external fertilization usually requires a water body. Here both the eggs and sperms are released into the water. Majority of external fertilization occurs during spawning. In the priceless spawning several eggs are released by the females at a time when the males also release several sperms. This fertilisation or reproduction process is influenced by sunlight and temperature. The benefits of performing the external fertilization in an aquatic body are that the eggs do not dry up. The spawning of eggs and sperms in external fertilization lead to greater biodiversity along with higher chances of genetic survival. Image will be uploaded soon
Aquatic animals generally release their gametes directly into the environment. It mostly takes place in fishes and amphibians. Descriptive external fertilisation 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.
It is known that frog’s lay eggs which hatch into tadpoles. The reproduction occurs by the process of external fertilization. The females release their eggs into the water which are then fertilised by the male sperms. Although the majority of the species of frogs undergo external fertilization, there are some frog species that reproduce through internal fertilization too. Scientists have discovered recently that a certain frog species instead of laying eggs, carry tadpoles inside them. This finding was a very unusual one as external fertilization is a common reproduction method for amphibians.
A few common disadvantages of external fertilization are mentioned as follows:
A simple major external fertilization advantage and benefit is that the chances of union between the gametes are high as a vast number of sperms and eggs are released into the water. External fertilization has greater synchronisation and is a much simpler process as compared to that of internal reproduction. Majority of algae reproduction are external fertilization examples.
Ans: External fertilization occurs in a moist environment as it gives the sperm an ability to move about and reach near the egg. The process by which Sorensen and eggs are released into the water is known as spawning. A large number of eggs and sperms are produced at the same time. The offspring’s mature rapidly in this process. A major disadvantage of the spawning process is that the eggs have a very short life span. Rate of fertilization of gametes is also very low as there is no guarantee if the eggs meet the sperms. External fertilization commonly occurs in fishes and amphibians. Other aquatic animals also perform external fertilization.
Ans: Water plays a very important role in the fertilization of eggs. The mobility of the gametes of both the male and female counterparts increase when it is in water. The water currents help the gametes to move towards each other. Although water is suitable for external fertilization to occur, there are some cases where the process takes place without the presence of water. For example, animals like earthworms perform fertilization in their cocoons. The scientist has tried to infuse external fertilization in the land but due to extreme lack of moisture, the process turns out to be a failure. Water is the best medium for external fertilization or spawning to occur.
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