Microscopic stalked pincer-like structures present in echinoderms are

Options

A. Tube Feet
B. Spines
C. Pedicellariae
D. Ossicles.

Answer

To answer the question about the microscopic stalked pincer-like structures present in echinoderms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the specific structures in echinoderms that are described as microscopic, stalked, and pincer-like.

2. **Identify the Options**: The options provided are:
- Tube feet
- Spines
- Pedicellaria
- Ossicles

3. **Analyze Each Option**:
- **Tube Feet**: These are small, tube-like projections used for locomotion and feeding. They are not pincer-like.
- **Spines**: These are hard structures that provide protection and support. They are not microscopic or pincer-like.
- **Pedicellaria**: These are small, pincer-like organs found on the skin of some echinoderms. They are indeed microscopic and can be stalked. They play a role in defense and keeping the skin clean.
- **Ossicles**: These are small calcareous elements that form the internal skeleton of echinoderms. They do not fit the description of being pincer-like or microscopic.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is **Pedicellaria**. These structures are specifically adapted for defense and maintenance of the echinoderm's body surface.

5. **Conclusion**: Therefore, the microscopic stalked pincer-like structures present in echinoderms are called **Pedicellaria**.