Embryogenesis

1.    Which of these events occurs FIRST during development of an insect egg?

Differentiation of germ layers

Enlargement of the germ band

Segregation of the germ cells

Migration of the cleavage nuclei

 

2.   Which structure becomes the yolk sac membrane?

Amnion

Chorion

Serosa

Germ band

 

3.   Which statement about germ cells is CORRECT?

They form the embryo

They differentiate into organ systems

They become the three germ layers

They form the eggs and sperm of the next generation

 

4.   Which structure develops from embryonic ectoderm?

Heart

Brain

Midgut

Muscle

 

5.   Which structure does NOT develop from embryonic mesoderm?

Blood

Ovary

Muscle

Spiracle

 

6.   Which part of the embryo develops LAST?

Head

Mouthparts

Legs

Abdomen

 

7.   In insect development, the germ band:

Forms the amniotic membrane.

Differentiates into three germ layers.

Starts the process of cleavage.

Remains undifferentiated throughout larval development.

 

8.   What region of the insect egg is associated with formation (or differentiation\ of the germ cells?

Oosome

Serosa

Germ band

Nucleus

 

9.   In an insect egg, the embryo begins to develop as soon as:

The germ band begins to enlarge.

The zygote nucleus starts to divide.

Fertilization occurs.

Cells reach the oosome.

 

10.   What is the correct sequence of the following events?
      1.   Migration of cleavage nuclei
      2.   Formation of the germ band
      3.   Differentiation of ectoderm
      4.   Growth of appendages

1, 2, 3, 4

2, 3, 1, 4

1, 3, 4, 2

1, 2, 4, 3