Human Reproduction Question 31
31. Select the correct sequence of events. [2019, Odisa]
(a) Gametogenesis $\rightarrow$ Gamete transfer $\rightarrow$ Syngamy $\rightarrow$ Zygote $\rightarrow$ Cell differentiation $\rightarrow$ Cell division (Cleavage) $\rightarrow$ Organogenesis.
(b) Gametogenesis $\rightarrow$ Gamete transfer $\rightarrow$ Syngamy $\rightarrow$ Zygote $\rightarrow$ Cell division (Cleavage) $\rightarrow$ Cell differentiation $\rightarrow$ Organogenesis.
(c) Gametogenesis $\rightarrow$ Gamete transfer $\rightarrow$ Syngamy $\rightarrow$ Zygote $\rightarrow$ Cell division $\rightarrow$ (Cleavage) $\rightarrow$ Organogenesis $\rightarrow$ Cell differentiation.
(d) Gametogenesis $\rightarrow$ Syngamy $\rightarrow$ Gamete transfer $\rightarrow$ Zygote $\rightarrow$ Cell division (Cleavage) $\rightarrow$ Cell differentiation $\rightarrow$ Organogenesis.
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Answer : b
Hints & Solutions
(b) The correct sequence of the events are as follows.
Gametogenesis $\rightarrow$ Gamete transfer $\rightarrow$ Syngamy $\rightarrow$ Zygote Cell division (Cleavage) $\rightarrow$ Cell differentiation $\rightarrow$ Organogenesis Gametogenesis is the formation of gametes (sperm and ovum) through spermatogenesis and oogenesis respectively.
Gamete transfer is the process of bringing together of male and female gamete for fertilisation.
Syngamy is fusion of gametes and leading to formation of zygote.
Cleavage is the repeated (mitotic) cell division. Cell differentiation refers to specialisation of cell to perform specific function.
Organogenesis is the formation of organs.
