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Standard XII
Zoology
Question

A morula can be differentiated form blastula in
  1. Presence of yolk
  2. Absence of cavity
  3. Presence of cavity
  4. Presence of more yolk

A
Presence of yolk
B
Absence of cavity
C
Presence of cavity
D
Presence of more yolk
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Solution
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Cleavage is the division of cells in an early embryo. After the zygote formation, cleavage begins and first formed is the morula. Morula contains 8-16 celled daughter cells known as blastomeres. It continues to divide further to form a blastocyst. The blastocyst has a cavity known as blastocoel along with an inner cell mass which is absent in the morula.
So the correct answer is D.

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