which of the following is a distinct character of chordates

Options

A. Chorda dorsalis
B. Cephalization
C. Claws
D. Pharyngotomy

Answer

To determine which of the following is a distinct character of chordates, we will analyze each option provided:

1. **Corda Dorsalis**: This is also known as the notochord. It is a rod-shaped structure that is present in the embryos of all chordates. The notochord is derived from mesodermal tissue and serves as a primitive axis for the developing embryo. It is a defining characteristic of chordates, making it a distinct feature.

2. **Cephalization**: This refers to the concentration of nervous tissue and sensory organs at the anterior end of an organism. While cephalization is a feature observed in many animal phyla, it is not exclusive to chordates. It is primarily associated with the phylum Echinodermata, which makes it an incorrect choice for a distinct chordate character.

3. **Claws**: Claws are pointed appendages found at the ends of toes or fingers, common in many amniotes such as mammals, reptiles, and birds. However, claws are not a defining characteristic of all chordates, as not all chordates possess claws. Thus, this option is also incorrect.

4. **Pharyngotomy**: This term refers to a surgical incision into the pharynx. It is a medical procedure and does not relate to the biological characteristics of chordates. Therefore, this option is incorrect as well.

Based on the analysis, the distinct character of chordates is:

**Answer**: Corda Dorsalis (Notochord)