Q. Correct sequence in development is
A) Fertilization $\rightarrow$ zygote $\rightarrow$ cleavage $\rightarrow$ morula $\rightarrow$ blastula $\rightarrow$ gastrula
B) Fertilization $\rightarrow$ zygotes $\rightarrow$ blastula $\rightarrow$ cleavage $\rightarrow$ gastrula
C) Fertilization $\rightarrow$ cleavage $\rightarrow$ morula $\rightarrow$ zygote $\rightarrow$ blastula
D) cleavage $\rightarrow$ zygote $\rightarrow$ morula $\rightarrow$ zygote $\rightarrow$ blastula
Explanation
Correct sequence in development is fertilisation (union of male of male and female gamete) $\downarrow$ Zygote (syngany or amphioxis) leads to the zygote) $\downarrow$ Cleavage (series of rapid mitotic division of the zygote) $\downarrow$ Morula (8-16 blastomere structure called morula having similar types of cells) $\downarrow$ Blastula (more than 16 blastomere (approx.-64) it is hollow structure With blastocoel cavity in center) $\downarrow$ Gastrula (Transformation of the blastocyst in the gastrula with primary germ layer by rearrangement a cell called gastrulation and structure is called gastrula)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.