Question 1

Which of the following best describes the process of cell differentiation during embryonic development?

Accepted Answer

Cells become increasingly specialized, acquiring distinct structures and functions.

Question 2

In frog embryology, what is the primary effect of the moderate amount of yolk (mesolecithal egg) on cleavage?

Accepted Answer

Cleavage is complete but unequal, resulting in smaller blastomeres at the animal pole and larger ones at the vegetal pole.

Question 3

Which stage of vertebrate embryonic development is characterized by the formation of a ball of cells with a cavity called the blastocoel?

Accepted Answer

Blastula formation

Question 4

During chick development, what is the function of the chalazae?

Accepted Answer

They anchor the ovum in the center of the egg and allow the embryo to rotate freely.

Question 5

Which of the following statements about gastrulation is correct?

Accepted Answer

Gastrulation is the process where the blastula is transformed into an embryo with multiple tissue layers and distinct body axes.

Question 6

What is the main difference between spiral cleavage and radial cleavage?

Accepted Answer

Spiral cleavage involves oblique divisions and leads to determinate development, while radial cleavage involves symmetrical divisions and leads to indeterminate development.

Question 7

In chick development, what is the primitive streak?

Accepted Answer

A thickening of the blastodisc where gastrulation is organized.

Question 8

Which equation best represents the relationship between the number of cells after $$n$$ rounds of cleavage, starting from a single zygote?

Accepted Answer

$$N = 2^n$$

Question 9

What is the role of morphogens in embryonic development?

Accepted Answer

They are signaling molecules that induce responses in cells based on their concentration.

Question 10

Which of the following is true about the blastodisc in chick development?

Accepted Answer

It is the region where cleavage and cellular parts of the embryo are restricted.

Question 11

During neurulation, which sequence correctly describes the formation of the neural tube?

Accepted Answer

Primitive groove → Neural plate → Neural groove and fold → Neural crest → Neural tube

Question 12

What is a somite, and what does it give rise to?

Accepted Answer

A block-like patch of mesodermal tissue that gives rise to muscle and bone.

Question 13

Which of the following best explains why cleavage, blastulation, and gastrulation vary in different animals?

Accepted Answer

The amount of yolk present in the egg cell affects these processes.

Question 14

In frog development, which pole contains the denser yolk and shifts downward by gravity?

Accepted Answer

Vegetal pole

Question 15

Which of the following is a key difference between frog and chick embryonic development?

Accepted Answer

Frog embryos have mesolecithal eggs with moderate yolk, while chick embryos have macrolecithal eggs with large yolk.

Question 16

Which structure acts as the primary 'organizer' during gastrulation and axis formation in amniote embryos?

Accepted Answer

Hensen’s node

Question 17

Where does the embryo in a chick egg get oxygen and release carbon dioxide?

Accepted Answer

Through the vitelline veins near the porous shell

Question 18

Which of the following best describes the fate of different regions of the blastula?

Accepted Answer

Different regions of the blastula have different developmental fates, forming distinct germ layers.

Question 19

Which of the following is NOT a stage in the vertebrate embryonic development cycle?

Accepted Answer

Photosynthesis

Question 20

Which of the following best describes the process of organogenesis?

Accepted Answer

Formation of organs from specialized and differentiated cells after gastrulation.

Embryology: Early Development in Vertebrates (Frog and Chick)

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