Meroblastic cleavage takes place in

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Cleavage Types**:
- Cleavage refers to the series of rapid cell divisions that occur after fertilization. There are two main types of cleavage: holoblastic and meroblastic.
- Holoblastic cleavage involves the complete division of the egg, while meroblastic cleavage involves partial division, typically seen in eggs with a significant amount of yolk.

2. **Identifying Meroblastic Cleavage**:
- Meroblastic cleavage occurs in species with yolk-rich eggs. This type of cleavage is characterized by the division of only a part of the egg, specifically the area where the cytoplasm is concentrated, which is known as the blastodisc.

3. **Analyzing the Options**:
- A. Hydra: This organism has a holoblastic cleavage because it has a small amount of yolk.
- B. Amphioxus: This organism also exhibits holoblastic cleavage due to its relatively smaller yolk.
- C. Frog: Frogs undergo holoblastic cleavage as well, despite having some yolk.
- D. Chick: Chick embryos undergo meroblastic cleavage because they have a large amount of yolk, which is not divided during cleavage.

4. **Conclusion**:
- Based on the analysis of the options, the organism where meroblastic cleavage occurs is the chick. Therefore, the correct answer is option D.

**Final Answer**: D. Chick

---