Funnel-shaped ciliated pits on the ventral side of kidney of Frog

Options

A. (a) nephridiopores
B. (b) nephrostomes
C. (c) neurotomes
D. (d) coelomostomes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the identification of funnel-shaped ciliated pits located on the ventral side of the kidney in frogs.

2. **Identifying the Options**: The options provided are:
- A. Nephrediopores
- B. Nephrostomes
- C. Neurotome
- D. Silomostome

3. **Analyzing Each Option**:
- **Nephrediopores**: These are excretory organs found in annelids (like earthworms) and are not present in frogs. Therefore, this option is incorrect.
- **Nephrostomes**: These structures are indeed present in frogs. They are funnel-shaped and ciliated, and they function to transport waste from the coelom (body cavity) to the renal system. This option seems to be a strong candidate for the answer.
- **Neurotome**: This is a dissecting instrument used for nerves and is unrelated to the question. Thus, this option is incorrect.
- **Silomostome**: These are ciliated funnels found in some invertebrates, but they are not associated with frogs. Hence, this option is also incorrect.

4. **Conclusion**: After analyzing all options, the correct answer is **B. Nephrostomes**, as they are the funnel-shaped ciliated structures located on the ventral side of the kidney in frogs.