A) Fertilization - zygote - cleavage - morula - blastula - gastrula
B) Fertilization -cleavage-morula-zygote-blastula-gastrula
C) Fertilization - zygote - blastula - morula - cleavage - gastrula
D) Cleavage - zygote - Fertilization - morula - blastula - gastrula
Correct Answer: A
Solution :
Fusion of male and female gamete produces a zygote. The repeated division of the zygote is called cleavage forming a solid morula. After further division and rearrangement, a fluid filled cavity surrounded by blastomeres, the blastula is formed. The appearance of germ layers marks the gastrula. Hence, the correct option is (a).
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