Meroblastic cleavage takes place in:

Options

A. Hydra
B. Amphioxus
C. Frog
D. Chick.

Answer

To determine where meroblastic cleavage takes place, let's analyze the options provided step by step.

### Step 1: Understand Cleavage Types
Cleavage in embryology refers to the series of rapid cell divisions that occur after fertilization. There are two main types of cleavage:
- **Holoblastic Cleavage**: This is complete cleavage where the entire egg divides into smaller cells. It occurs in eggs with little to moderate yolk.
- **Meroblastic Cleavage**: This is incomplete cleavage where only a part of the egg divides. It occurs in eggs with a large amount of yolk.

### Step 2: Analyze the Options
Now, let's evaluate the options given:
- **Option A: Hydra** - Hydra is a simple organism that does not undergo cleavage in the same manner as vertebrates. It reproduces asexually through budding, so it does not have meroblastic cleavage.

- **Option B: Amphioxus** - Amphioxus has a relatively small amount of yolk in its eggs and undergoes holoblastic cleavage, not meroblastic cleavage.

- **Option C: Frog** - Frogs have a significant amount of yolk in their eggs, but they undergo holoblastic cleavage due to the presence of a specific type of egg structure that allows complete division.

- **Option D: Chick** - Chick embryos develop from eggs with a large amount of yolk. In this case, the cleavage is meroblastic because the yolk prevents complete division of the egg.

### Step 3: Conclusion
Based on the analysis, the only organism from the options that undergoes meroblastic cleavage is the chick (Option D).

### Final Answer
**Meroblastic cleavage takes place in: Option D - Chick.**

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