Embryonic Development and Pregnancy

The embryo layer that forms the skin and nervous tissue is the _____.

• endoderm

• mesoderm

• ectoderm

• deuterostome

When the blastocyst attaches to the lining of the uterus, this is known as

• fertilization
• ovulation
• implantation
• mitosis

What structure protects and cushions the fetus throughout its prenatal development?

• amniotic sac and fluid
• placenta
• umbilical cord
• vagina

The structure that manages the exchange of nutrients and wastes between fetus and mother is

• 4
• 5
• 6
• 7

After the egg is fertilised, where does the fertilized egg develops?

• A
• B
• C
• D

The heart, muscles, bones and blood develop primarily from

• Ectoderm

• Mesoderm

• Endoderm

• Placenta

This is a process of withdrawing a sample of fluid from the surrounding unborn baby to test for birth defects.

• Chorionic Villis Sampling
• Amniocentisis
• Photosynthesis
• Monogram

Which is NOT true about the placenta?

• Nutrients, gases, and wastes diffuse in 2 directions within it.
• It is formed from a combination of fetus and uterus cells. 
• Found only in mammals
• Maternal and fetal blood mix in this structure.

During the development of an embryo, at a certain stage, a structure called a gastrula forms, which has 3 tissue layers (and thus, 3 cell types). What is the significance of this stage.

• It is where differentiation begins
• mitosis speeds up during this stage.
• Meiosis occurs for the first time at this point.
• It is when fertilization occurs.

Tags

NGSS.HS-LS1-4

In which choice are the four events in the correct order?

• fertilization, cleavage, differentiation, organ development
• cleavage, fertilization, differentiation, organ development
• differentiation, fertilization, cleavage, organ development
• fertilization, organ development, differentiation, cleavage.