Pregnancy begins with implantation of____________.

embryo

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foetus

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fertilised egg

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zygote

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Solution

The correct option is A embryo
Fertilisation is the process of fussion of male and femele gamete resulting in the formation of a single celled zygote.
After the formation of the zygote it undergoes further development. This development takes place through cellular division.
The single celled zygote further undergoes mitotic cleavage (an equational division of cells one to two, two to four, and so on).
Finally this multicellular structure (ball of cells) attaches itself to the uterine wall for its further development.This attachment process is termed implantation.

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