Early embryonic stage that follows blastula is

Options

A. Morula
B. Amphiblastula
C. Radula
D. Gastrula.

Answer

To solve the question regarding the early embryonic stage that follows the blastula, we can break it down into the following steps:

### Step 1: Understand the Blastula Stage
The blastula is an early stage of embryonic development characterized by a hollow ball of cells. It typically consists of about 64 cells and contains a fluid-filled cavity known as the blastocoel.

**Hint:** Remember that the blastula is a hollow structure formed after several rounds of cell division.

### Step 2: Identify the Next Stage
After the blastula stage, the next significant stage in embryonic development is called gastrulation. During gastrulation, the cells undergo extensive movement and rearrangement, leading to the formation of the gastrula.

**Hint:** Look for the process that involves the formation of germ layers, which is a key feature of the next stage after the blastula.

### Step 3: Differentiate Between Other Options
- **Morula:** This is the stage that precedes the blastula, consisting of about 16 cells.
- **Amphiblastula:** This is not an embryonic stage; it is a larval stage found in sponges.
- **Radula:** This is not related to embryonic development; it is a feeding structure found in some mollusks.

**Hint:** Eliminate options that do not fit the context of embryonic development stages.

### Step 4: Conclusion
Based on the understanding of the developmental stages, the early embryonic stage that follows the blastula is the **gastrula**.

**Final Answer:** The early embryonic stage that follows the blastula is the **gastrula**.