Question

The stage of development at which implantation occurs in human female is

• A. Morula
• B. Zygote
• C. Blastocyst
• D. Neurula

Answer 1

The correct option is C

Blastocyst

After fertilisation, as the zygote moves through the fallopian tube towards the uterus, mitotic divisions occur resulting in 2, 4, 8, and then16 daughter cells, called blastomeres. The embryo with 8 to 16 blastomeres is called morula. Cleavage divisions in the morula transform it into a blastocyst as it moves further into the uterus. The blastocyst gets embedded in the inner uterine wall, which is the process called implantation.