Embryonic Development - Cleavage to Gastrulation - Unsolved Practice Set
Chapter: Human Reproduction | Topic: Embryonic Development Cleavage to Gastrulation
EMBRYONIC DEVELOPMENT - CLEAVAGE TO GASTRULATION - UNSOLVED PRACTICE SET
Topic: Embryonic Development Cleavage to Gastrulation
Multiple Choice Questions
Q1. The rapid mitotic divisions of the zygote that occur without any significant increase in overall size are called:
- Gastrulation
- Cleavage
- Organogenesis
- Implantation
Q2. The solid ball of cells formed after several cleavage divisions of the zygote is called the:
- Blastocyst
- Morula
- Gastrula
- Zygote
Q3. During gastrulation, the embryo reorganises into how many primary germ layers?
- Two
- Three
- Four
- Five
Q4. The germ layer that gives rise to the nervous system and skin is the:
- Endoderm
- Mesoderm
- Ectoderm
- Trophoblast
Q5. Organogenesis refers to the:
- Formation of the blastocyst
- Formation of organs from germ layers
- Formation of the zygote
- Process of implantation
Short Answer Questions
Q6. What is cleavage, and how does a blastomere differ from the original zygote in size?
Q7. Define gastrulation, and name the three germ layers formed during this process.
Q8. Name one organ or structure each that typically develops from the ectoderm, mesoderm, and endoderm.
Q9. What is a morula, and how is it different from a blastocyst?
Long Answer Questions
Q10. Describe the process of cleavage in a human zygote, explaining how it leads to the formation of a morula and then a blastocyst.
Q11. Explain the significance of gastrulation in embryonic development, describing how the three germ layers go on to form different body systems.
APPLICATION / ANALYSIS
Q12. A biology student examines a stained slide of an early human embryo and observes a solid mass of cells with no visible internal cavity. Based on the stage of development, is this more likely to be a morula or a blastocyst? Justify your answer.
Q13. If gastrulation fails to occur properly in a developing embryo and the three germ layers do not form correctly, predict what kind of developmental consequences this might have, giving a reason based on the role of germ layers in organ formation.