Early Embryonic Development Quizzes: Test Your Knowledge

Question 1

During early embryonic development, the inner cell mass of the blastocyst undergoes a process that gives rise to the three germ layers of the embryo. This process is known as:

Accepted Answer

Gastrulation

Answer

Blastulation

Answer

Neurulation

Answer

Organogenesis

Question 2

Which of the following events marks the beginning of embryonic development?

Accepted Answer

Fertilization

Answer

Cleavage

Answer

Implantation

Answer

Gastrulation

Question 3

Where does implantation typically occur in humans?

Accepted Answer

Uterus

Answer

Uterine tubes

Answer

Ovaries

Answer

Vagina

Question 4

Which of the following is NOT a germ layer formed during gastrulation?

Accepted Answer

Supraderm

Answer

Ectoderm

Answer

Mesoderm

Answer

Endoderm

Question 5

Which of the following is a characteristic of the morula stage of development?

Accepted Answer

Multicellular ball

Answer

Single-celled zygote

Answer

Hollow blastocyst

Answer

Three distinct germ layers

Question 6

What is the role of the zona pellucida?

Accepted Answer

To prevent polyspermy

Answer

To facilitate fertilization

Answer

To provide nutrients to the embryo

Answer

To facilitate implantation

Question 7

Which of the following is the first extra-embryonic structure to form?

Accepted Answer

Yolk sac

Answer

Amniotic sac

Answer

Placenta

Answer

Allantois

Question 8

What is the significance of Hox genes during embryonic development?

Accepted Answer

They regulate the anteroposterior axis

Answer

They control cell differentiation

Answer

They are responsible for organogenesis

Answer

They induce gastrulation

Question 9

In the blastocyst, which layer develops into the chorionic villi that form the placenta with the uterine decidua?

Accepted Answer

Trophoblast

Answer

Inner cell mass

Answer

Epiblast

Question 10

In early embryonic development, which primary germ layer gives rise to the nervous system and skin?

Accepted Answer

Ectoderm

Answer

Mesoderm

Answer

Endoderm

Question 11

During embryonic implantation, the blastocyst attaches to the wall of the uterus through a process known as:

Accepted Answer

Implantation

Answer

Gastrulation

Answer

Cleavage

Question 12

Which structure separates the embryo into three germ layers during gastrulation?

Accepted Answer

Primitive streak

Answer

Neural tube

Answer

Notochord

Question 13

Which part of the embryo eventually develops into the embryo proper?

Accepted Answer

Inner cell mass

Answer

Trophoblast

Answer

Blastocoel

Question 14

Among the extra-embryonic membranes, which one supports the embryo and facilitates gas exchange?

Accepted Answer

Chorion

Answer

Amnion

Answer

Yolk sac

Question 15

Which stage of embryonic development is characterized by the formation of the neural tube?

Accepted Answer

Neurulation

Answer

Zygote

Answer

Blastocyst

Question 16

In holoblastic cleavage, the fertilized egg divides into blastomeres of:

Accepted Answer

Equal size

Answer

Unequal size

Answer

Variable size

Question 17

The term 'zygote' refers to the:

Accepted Answer

Fertilized egg

Answer

Embryo

Answer

Fetus

Question 18

Which hormone triggers ovulation in humans?

Accepted Answer

LH

Answer

FSH

Answer

Progesterone

Question 19

The process by which the fertilized egg undergoes cell division and multiplication is known as:

Accepted Answer

Cleavage

Answer

Spermatogenesis

Answer

Gastrulation

Question 20

Where does implantation of the blastocyst typically occur?

Accepted Answer

Uterine body

Answer

Uterine fundus

Answer

Uterine cervix

Answer

Cervical canal

Question 21

Which layer of the blastocyst gives rise to the embryo proper?

Accepted Answer

Inner cell mass

Answer

Trophoblast

Answer

Epiblast

Answer

Hypoblast

Question 22

Which of the following structures is derived from the ectoderm?

Accepted Answer

Epidermis

Answer

Bones

Answer

Heart

Answer

Liver

Question 23

What is the primary role of human chorionic gonadotropin (hCG) during early pregnancy?

Accepted Answer

Maintaining the corpus luteum and progesterone production

Answer

Stimulating uterine contractions

Answer

Promoting embryo implantation

Answer

Triggering ovulation