Give examples and explain what is meant by external fertilisation?

1.	Give examples and explain what is meant by external fertilisation?
Answer» EXTERNAL fertilization is a case in which FUSION of male and female gametes takes place in OUTSIDE environment/ medium and not in the body of the female . for example, in case of frogs , fertilization takes place in water medium . the female releases eggs in the water at the same time sperms are released too. the water current helps the meeting and fusion of gametes . The release of eggs and sperm into the water is known as spawning. likewise many fish follow similar method . since the PROBABILITY of sperm meeting the right egg is low ( due to factors like predators and unfavorable conditions , a large number of these( gametes ) are produced to compensate the loss .

Answer»

EXTERNAL fertilization is a case in which FUSION of male and female gametes takes place in OUTSIDE environment/ medium and not in the body of the female .

for example, in case of frogs , fertilization takes place in water medium . the female releases eggs in the water at the same time sperms are released too. the water current helps the meeting and fusion of gametes .

The release of eggs and sperm into the water is known as spawning.

likewise many fish follow similar method .

since the PROBABILITY of sperm meeting the right egg is low ( due to factors like predators and unfavorable conditions , a large number of these( gametes ) are produced to compensate the loss .

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