Solid blastula is known as

Options

A. Coeloblastula
B. Disocoblastula
C. Stereoblastula
D. Superficial blastula.

Answer

To solve the question "Solid blastula is known as," we can follow these steps:

### Step-by-step Solution:

1. **Understand the term "blastula":**
- A blastula is an early stage of embryonic development that follows the cleavage stage. It is typically a hollow sphere of cells surrounding a fluid-filled cavity known as the blastocoel.

2. **Identify the types of blastulae:**
- There are different types of blastulae based on their structure and the type of cleavage that occurs during development. Some common types include celioblastula, discoblastula, stereoblastula, and superficial blastula.

3. **Define "solid blastula":**
- A solid blastula refers to a type of blastula that lacks a blastocoel, which means it is not hollow. This type of blastula is characterized by the absence of a fluid-filled cavity.

4. **Analyze the options given:**
- A. Celioblastula: This type has a blastocoel.
- B. Discoblastula: This type is typically a disc-shaped blastula with a blastocoel.
- C. Stereoblastula: This type is solid and lacks a blastocoel, making it the correct answer.
- D. Superficial blastula: This type is also not solid and has a blastocoel.

5. **Conclusion:**
- Based on the definitions and characteristics of the types of blastulae, the solid blastula is known as **stereoblastula**.

### Final Answer:
The solid blastula is known as **C. stereoblastula**.

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