One of the primary characters of chordates is

Options

A. Ganglionated nerve cord
B. Paired nerve cord
C. Solid ventral nerve cord
D. Dorsal hollow nerve cord

Answer

To answer the question about one of the primary characters of chordates, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Chordates**: Chordates are a diverse group of animals that share certain key characteristics at some stage of their development.

2. **Identify Key Features of Chordates**: The primary characters that define chordates include:
- **Presence of a Notochord**: A flexible rod-like structure that provides support.
- **Dorsal Hollow Nerve Cord**: A nerve cord located on the dorsal side (back) of the organism, which is hollow.
- **Paired Pharyngeal Gill Slits**: Openings in the pharynx that can function in respiration and feeding.
- **Post-anal Tail**: An extension of the body past the anal opening.

3. **Evaluate the Options Given**: The question likely provides multiple-choice answers. We need to evaluate each option against the key features:
- **Option 1**: Ganglionated nerve cord - Incorrect, as chordates have a dorsal hollow nerve cord.
- **Option 2**: Paired nerve cord - Incorrect, as they have paired pharyngeal gill slits, not paired nerve cords.
- **Option 3**: Solid ventral nerve cord - Incorrect, as chordates possess a dorsal hollow nerve cord, not a solid ventral one.
- **Option 4**: Dorsal hollow nerve cord - Correct, as this is one of the primary characteristics of chordates.

4. **Select the Correct Answer**: Based on the evaluation, the correct answer is **Option 4: Dorsal hollow nerve cord**.