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Chordates are distinguished from non chordates by the presence of : -
- a)Brain
- b)Dorsal tubular hollow nerve cord
- c)Ventral nerve cord
- d)Dorsal solid nerve cord
Correct answer is option 'B'. Can you explain this answer?
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Chordates are distinguished from non chordates by the presence of : -a...
The dorsal nerve cord is only one embryonic feature unique to all chordates, among the other four chordate features-- a notochord, a post-anal tail, an endostyle, and pharyngeal slits.In vertebrates, the dorsal nerve cord is modified into the central nervous system, which comprises the brain and spinal cord.
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Chordates are distinguished from non chordates by the presence of : -a...
Differentiation of Chordates from Non-Chordates
Chordates and non-chordates represent two major classifications in the animal kingdom. The defining characteristics of chordates set them apart from non-chordates.
Key Characteristic: Dorsal Tubular Hollow Nerve Cord
- Chordates possess a **dorsal tubular hollow nerve cord**, which is a crucial feature during their embryonic development.
- This structure is located along the back (dorsal side) of the organism and is responsible for the central nervous system's formation, which includes the brain and spinal cord.
Importance of the Dorsal Nerve Cord
- The dorsal tubular nerve cord differentiates chordates from non-chordates, which typically have a **ventral solid nerve cord**.
- This dorsal position allows for better protection and integration of sensory information, contributing to the evolution of more complex nervous systems in chordates.
Additional Features of Chordates
- Aside from the dorsal hollow nerve cord, chordates are characterized by other features, such as:
- **Notochord**: A flexible rod providing support.
- **Pharyngeal slits**: Openings in the throat area, which may develop into gills in aquatic species.
- **Post-anal tail**: An extension of the body beyond the anal opening, aiding in locomotion.
Conclusion
In summary, the presence of a **dorsal tubular hollow nerve cord** is a distinct and vital feature that distinguishes chordates from non-chordates, contributing to their complexity and evolutionary advancements. Understanding this characteristic is essential for students preparing for exams like NEET.
Chordates and non-chordates represent two major classifications in the animal kingdom. The defining characteristics of chordates set them apart from non-chordates.
Key Characteristic: Dorsal Tubular Hollow Nerve Cord
- Chordates possess a **dorsal tubular hollow nerve cord**, which is a crucial feature during their embryonic development.
- This structure is located along the back (dorsal side) of the organism and is responsible for the central nervous system's formation, which includes the brain and spinal cord.
Importance of the Dorsal Nerve Cord
- The dorsal tubular nerve cord differentiates chordates from non-chordates, which typically have a **ventral solid nerve cord**.
- This dorsal position allows for better protection and integration of sensory information, contributing to the evolution of more complex nervous systems in chordates.
Additional Features of Chordates
- Aside from the dorsal hollow nerve cord, chordates are characterized by other features, such as:
- **Notochord**: A flexible rod providing support.
- **Pharyngeal slits**: Openings in the throat area, which may develop into gills in aquatic species.
- **Post-anal tail**: An extension of the body beyond the anal opening, aiding in locomotion.
Conclusion
In summary, the presence of a **dorsal tubular hollow nerve cord** is a distinct and vital feature that distinguishes chordates from non-chordates, contributing to their complexity and evolutionary advancements. Understanding this characteristic is essential for students preparing for exams like NEET.
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Chordates are distinguished from non chordates by the presence of : -a)Brainb)Dorsal tubular hollow nerve cordc)Ventral nerve cordd)Dorsal solid nerve cordCorrect answer is option 'B'. Can you explain this answer?
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