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Question

The correct sequence of various stages in embryonic development is

A
Fertilization --> Cleavage --> Morula --> Blastula --> Gastrula
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B
Cleavage --> Fertilization --> Gastrula --> Blastula
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C
Blastula --> Cleavage --> Gastrula --> Fertilization
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D
Gastrula --> Fertilization --> Cleavage --> Blastula
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Solution

The correct option is B Fertilization --> Cleavage --> Morula --> Blastula --> Gastrula
When sperm and ovum fuses with each other, fertilization takes place and forms zygote. After fertilization, zygote undergoes rapid cell divisions (cleavage) to form morula, which is an 8 cell mass in a spherical shape which undergoes further cell divisions to form a spherical ball of cells; blastula, which is hollow sphere of cells. Blastula finally forms gastrula, which is three layered structure known as ectoderm, mesoderm and endoderm. Hence, correct sequence is Fertilization --> Cleavage --> Morula --> Blastula --> Gastrula.

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