| Column I | Column II | ||
| A. | Morula | 1. | 30 hours to 3 days |
| B. | Blastocyst | 2. | 12-14 hours |
| C. | Cleavage | 3. | Solid ball |
| D. | Zygote | 4. | Hollow ball |
A) A-3, B-4, C-1, D-2
B) A-2, B-3, C-1, D-2
C) A-4, B-3, C-2, D-1
D) A-3, B-1, C-2, D-4
Correct Answer: A
Solution :
Zygote, cleavage, morula and blastocyst are the principal stages that occur during development in humans. Zygote forms after 12-14 hours of ovulation. Cleavage involves mitotic divisions. Morula occurs on third to fourth day of fertilisation and blastocyst appears on fifth day to end of second week.
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