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Developmental Biology (Embryology) — MCQs

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1. The study of the development of an embryo from fertilization to birth is called:





2. Fertilization in humans usually occurs in the:





3. The fusion of sperm and ovum forms a:





4. The zygote undergoes repeated mitotic divisions known as:





5. A solid ball of cells formed during early cleavage is called:





6. The hollow ball of cells formed during development is:





7. The process by which the blastocyst attaches to the uterine wall is called:





8. The three germ layers are formed during:





9. The outermost germ layer is:





10. The innermost germ layer is:





11. The middle germ layer is:





12. The nervous system develops from the:





13. The skeletal and muscular systems develop from the:





14. The digestive system develops mainly from the:





15. Formation of the neural tube is called:





16. Failure of closure of the neural tube results in:





17. The placenta is derived from:





18. The fluid that surrounds and protects the developing embryo is:





19. The structure that connects the fetus to the placenta is:





20. The hormone detected in pregnancy tests is:





21. Organ formation in the embryo is called:





22. The first organ to develop and function in the embryo is:





23. The process of formation of gametes is called:





24. The process by which sperm acquire the ability to fertilize an egg is:





25. The outer layer of the blastocyst that forms part of the placenta is:





26. The inner cell mass of the blastocyst forms the:





27. The yolk sac primarily contributes to:





28. The structure that produces progesterone in early pregnancy is:





29. Twins formed from two separate eggs are called:





30. Twins formed from one fertilized egg are called:





31. The process of cell specialization is called:





32. Which germ layer forms the lungs?





33. Which germ layer forms the kidneys?





34. Which germ layer forms the skin epidermis?





35. The hormone responsible for uterine contractions during childbirth is:





36. The time period from fertilization to 8 weeks of development is called:





37. The time period from 9 weeks until birth is called:





38. The chorionic villi are responsible for:





39. The notochord develops from which germ layer?





40. The structure that induces neural tube formation is:





41. Human gestation period is approximately:





42. The decidua basalis is part of the:





43. Which extraembryonic membrane forms the fetal part of the placenta?





44. The primitive streak is first seen during:





45. The embryonic structure that later forms the brain and spinal cord is:





46. The somites give rise to:





47. The embryonic heart begins to beat at around:





48. The pharyngeal arches contribute to development of:





49. The first blood cells are formed in the:





50. Teratology is the study of:





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