Fertilization is defined as the process by which

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a diploid spermatozoan unites with a haploid ovum to form a triploid zygote.

a haploid spermatozoa unites with a haploid ovum to form a diploid zygote.

a diploid spermatozoan unites with a diploid ovum to form a diploid zygote.

a diploid spermatozoan unites with a haploid ovum to form a diploid zygote.

answer is B.

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Detailed Solution

Concept: Gametes have half the number of chromosomes of the original organism. By the process of fertilization or fusion the haploid or spermatozoa and ovum or female germ cell fuse together to give rise to diploid zygote.
The fertilization is also known as the reproductive fertilization. This is a combination of gametes to produce a new living thing or the offspring and to start its growth. The processes like breeding or fertilization that takes place before the incorporation of the gametes are also sometimes incorrectly termed as the fertilization. The cycle of the reproduction and development of young people is known as gender production.
Hence option 2 is the correct answer.

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