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What Is External Fertilisation?
External fertilisation is the process of fertilisation that occurs outside of the body. This typically occurs in water, such as in a pond or lake, where the male and female reproductive cells can mix and fertilisation can occur. External fertilisation is often used in aquaculture, or the farming of fish, to increase the population of fish.
Starfish
Starfish are marine invertebrates of the class Asteroidea. They typically have five arms, though some species have up to 40. Starfish are classified in the phylum Echinodermata, which also includes sea urchins, sand dollars, and sea cucumbers.
Starfish are predators that use their arms to catch prey. They have a hard, spiny skeleton that can be used for defense. Starfish can also regenerate lost arms.
Starfish are found in both the Pacific and Atlantic oceans. They live in both shallow and deep water.
Sea urchins
Sea urchins are echinoderms that inhabit marine environments around the world. They are spiny, globular animals that feed on algae and other plant life. There are approximately 200 different species of sea urchins.
Corals
are marine animals that are in the phylum Cnidaria. They are invertebrates and have a sac-like body that is attached to a hard skeleton. The body is made up of a single layer of cells and is covered in cilia (tiny hairs). There are over 8,000 different species of coral and they can be found in all of the world’s oceans.
Coral reefs are made up of billions of coral animals. They form a huge structure that can be seen from space. Coral reefs are important because they provide a habitat for a large number of marine animals, they protect coastlines from storms, and they help to produce oxygen.
Frogs
are amphibians. They are cold-blooded vertebrates that have smooth, wet skin. They live in or near water and lay eggs in water. Frogs can jump up to 12 feet and they can hear and see well. Frogs eat insects, spiders, and other small animals.
Frogs are amphibians. Amphibians are cold-blooded animals that are able to live in water and on land. Frogs are able to jump up to 12 feet and they can hear and see well. Frogs eat insects, spiders, and other small animals. Frogs have smooth, wet skin and they lay eggs in water.
Fishes
are ectothermic animals. This means that their internal body temperature is regulated by the temperature of their surroundings. As a result, fishes are very sensitive to environmental changes and can be adversely affected by even small fluctuations in temperature.
Fishes are ectothermic animals because they lack the ability to generate their own internal heat. Instead, their internal body temperature is regulated by the temperature of the water in which they live. This means that fishes are very sensitive to environmental changes and can be adversely affected by even small fluctuations in temperature.
For example, if the water temperature in a pond rises by just a few degrees, the fishes living in that pond may become stressed and may even die. Conversely, if the water temperature in a pond drops by just a few degrees, the fishes living in that pond may become lethargic and may even die.
Advantages of External Fertilisation
External fertilisation has a number of advantages over internal fertilisation. First, it allows sperm to be placed close to the eggs, which increases the chances of fertilisation. Second, it allows eggs to be fertilised outside of the body, which increases the number of eggs that can be fertilised. Third, it allows sperm to be selected for quality before fertilisation. Finally, it allows fertilised eggs to be transferred back into the body, which increases the chances of a successful pregnancy.
Disadvantages of External Fertilisation
There are a number of disadvantages to external fertilisation. One is that there is a greater chance for the eggs and sperm to be mixed up, which can lead to fertilisation errors. Additionally, there is a greater chance for the eggs to be damaged or lost in the process. Finally, there is also a greater chance for the embryos to be damaged or lost.
External Fertilisation in Human Beings
External fertilisation in human beings occurs when the male ejaculates semen into the female’s vagina. The sperm swim through the cervix and uterine tubes to the ovaries, where one of them fertilises an egg. The fertilised egg then moves to the uterus, where it implants in the lining and begins to grow.
Which of the Following is a Disadvantage of External Fertilisation?
A disadvantage of external fertilisation is that the sperm and eggs are not in contact with each other, so the process is less efficient than internal fertilisation.
The main disadvantage of external fertilisation is that it is less efficient than internal fertilisation. With external fertilisation, the sperm must swim through the environment and cross the woman’s reproductive tract before they reach the egg. This increases the chance that the sperm will die or be unable to fertilise the egg.
There are several potential disadvantages of external fertilisation. One is that it can be difficult to get the sperm and eggs to meet properly, leading to fertilisation failure. Another is that the process can be stressful for the eggs and sperm, leading to reduced fertility. Additionally, external fertilisation can be expensive and time-consuming.
