Grade 12 Embryology Worksheet
This worksheet covers key concepts in embryology, including fertilization, early developmental stages, germ layers, and factors influencing embryonic development.
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Grade 12 Embryology Worksheet
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Read each question carefully and provide concise answers based on your understanding of embryology.
1. Which of the following is the correct order of early embryonic development stages?
Zygote, morula, blastula, gastrula
Blastula, morula, zygote, gastrula
Gastrula, blastula, morula, zygote
Morula, zygote, blastula, gastrula
2. Which primary germ layer gives rise to the nervous system and epidermis?
Endoderm
Mesoderm
Ectoderm
Neural crest
3. The process of cell division without an increase in overall size during early embryonic development is called .
4. The inner cell mass of the blastocyst eventually develops into the and the .
5. Briefly explain the significance of gastrulation in embryonic development.
6. Describe the primary function of the placenta during fetal development.
7. Teratogens are agents that can cause birth defects.
True
False
8. The process of organogenesis is completed by the end of the first trimester.
True
False
Match each term on the left with its description on the right.
9. Morula
a. Hollow ball of cells
10. Blastula
b. Solid ball of cells
11. Gastrula
c. Embryo with three germ layers