Define external fertilization. Mention its disadvantages.

Solution

The fertilization in which the fusion of gametes occurs outside the body of the female in an external medium i.e. water. Organisms that exhibit external fertilization show a great synchrony between the sexes in order to liberate the gametes at the same time.Examples. Bony fishes, amphibians etc.

Disadvantages of external fertilization are :

(1) A large number of gametes are produced to ensure fertilization thus there is wastage.

(2) The offsprings formed are extremely vulnerable to predators and are risk upto adulthood.

(3) The gametes and zygotes face a greater risk of dessication.

Some More Questions From Reproduction in Organisms Chapter

Which of the following is bisexual ?

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Reproduction In Organisms

Define external fertilization. Mention its disadvantages.

Some More Questions From Reproduction in Organisms Chapter

Which of the following is bisexual ?

Frog is ................... while human female is ....................

Testes lie in ................... while ovaries lie in ....................

In Rhizopus, asexual reproduction takes place by...................formation.

....................in Penicillium are formed on conidiophores.

In sweet potato, vegetative propagation takes place through............

In Bryophyllum vegetative propagation takes place through.............

Period of sexual maturity.

A mechanical and physiological connection between foetus and mother.

Repair of damaged tissue or redevelopment of lost part.

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