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Embryologists can presume the future org...

Embryologists can presume the future organs of the embryo in

A

Blastula

B

Early gastrula

C

Morula

D

Post gastrula

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Stages of Embryonic Development**: The embryonic development progresses through several stages, namely, the zygote, morula, blastula, and gastrula. 2. **Identifying the Key Stages**: - The **morula** stage is a solid ball of cells formed after several divisions of the zygote. - The **blastula** stage follows, where the morula transforms into a hollow sphere of cells. - The **gastrula** stage is characterized by the formation of three germ layers: ectoderm, mesoderm, and endoderm. 3. **Recognizing the Process of Gastrulation**: The transition from the morula to the gastrula is known as gastrulation. It is during this process that the cells begin to differentiate into various types. 4. **Determining When Organ Formation Begins**: Organ formation starts during the gastrula stage. Therefore, while the early gastrula stage does not yet have fully formed organs, it is in the later gastrula and post-gastrula stages that organogenesis occurs. 5. **Evaluating the Given Options**: - **Blastula**: Incorrect, as organ formation does not occur here. - **Early Gastrula**: Incorrect, as organ formation begins after this stage. - **Morula**: Incorrect, as this stage is before gastrulation. - **Post-Gastrula**: Correct, as this stage is when organ formation is actively taking place. 6. **Conclusion**: The correct answer is that embryologists can presume the future organs of the embryo in the post-gastrula stage. **Final Answer**: Option 4 - Post-Gastrula ---

**Step-by-Step Solution:** 1. **Understanding the Stages of Embryonic Development**: The embryonic development progresses through several stages, namely, the zygote, morula, blastula, and gastrula. 2. **Identifying the Key Stages**: - The **morula** stage is a solid ball of cells formed after several divisions of the zygote. - The **blastula** stage follows, where the morula transforms into a hollow sphere of cells. - The **gastrula** stage is characterized by the formation of three germ layers: ectoderm, mesoderm, and endoderm. ...
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