Question

The image given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which set of I-V have been correctly identified?

• A. I - Zygote, II - Ovum, III - Morula, IV - Blastocyst, V - Implantation of blastocyst
• B. I - Ovum, II - Morula, III - Zygote, IV - Blastocyst, V - Implantation of blastocyst
• C. I - Ovum, II - Zygote, III - Morula, IV - Blastocyst, V- Implantation of blastocyst
• D. I - Ovum, II - Zygote, III - Blastocyst, IV - Morula, V - Implantation of blastocyst

Answer 1

The correct option is C I - Ovum, II - Zygote, III - Morula, IV - Blastocyst, V- Implantation of blastocyst

The secondary oocyte (ovum) (I) is released from the ovary and gets fertilised if simultaneously sperm also reaches the fallopian tube and forms zygote (II).

The zygote further divides by mitosis and forms 2, 4, 8, 16 daughter cells called blastomeres. The embryo with 8-16 blastomeres is called morula (III). Morula further divides and transforms into blastocyst (IV) and then the blastocyst gets implanted in the uterus (V).