Eye of the following group that resembles vertebrate eye is

Options

A. Bivalvia
B. Gastropoda
C. pelecypoda
D. Cephalochordata

Answer

To determine which group of organisms has eyes that resemble vertebrate eyes, we can analyze the options provided step by step.

### Step-by-Step Solution:

1. **Identify the Groups**: The question presents four groups: Bivalves, Pilecipoda, Gastropoda, and Cephalocordata. We need to evaluate the eye structure of each group.

2. **Bivalves**:
- Bivalves are simple organisms that typically do not have complex eyes. They have very basic sensory structures, and in many cases, they lack eyes altogether.
- **Conclusion**: Bivalves do not resemble vertebrate eyes.

3. **Pilecipoda**:
- Pilecipoda is another name for a group of bivalves. Similar to bivalves, they possess very simple eyes located at the margins of their mantle, if present at all.
- **Conclusion**: Pilecipoda also does not resemble vertebrate eyes.

4. **Gastropoda**:
- Gastropods have small eye spots located on top of their tentacles. These structures are made of simple ocelli, which provide limited vision.
- **Conclusion**: Gastropoda have primitive eye structures that do not resemble vertebrate eyes.

5. **Cephalocordata**:
- Cephalocordata, found in the phylum Echinodermata, possess single-chambered eyes that are somewhat similar to vertebrate eyes.
- Their eyes can rotate 360 degrees, allowing them to scan their environment effectively. However, they have an inverted retina, which means they perceive images differently than vertebrates.
- **Conclusion**: Cephalocordata have the most advanced eye structure among the options and resemble vertebrate eyes the most.

6. **Final Answer**: Based on the analysis, the group that has eyes resembling vertebrate eyes is **Cephalocordata**.