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Human Reproduction — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Reproduction3 Marks
Question
Differentiate between morula and blastocyst as stages in human embryonic development. Which of these stages gets implanted in the uterine wall and about how many days after fertilization?
✓

Answer

S. No.
Morula
Blastocyst
1.
It is a solid sphere of 8-16 blastomeres.
 
It contains about 64 cells and hollow inside due to the development of blastocoel cavity.
2.
Zona-pellucida remains intact
As the blastocyst enlarges, zona pellucida disintegrates. Blastocyst gets implanted after 7 days of fertilization.
 
Blastocyst gets implanted after 7 days of fertilization.

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